Big-stage sound, pocket-size freedom

Turn any phone or laptop into a serious hi‑fi source. Cayin RU3 brings clean, confident drive and a naturally musical tuning to your everyday listening—without the battery drain and bulk of a portable rig. If your pain points are flat dynamics, anemic bass, or hiss with sensitive IEMs, RU3 answers with 560 mW of balanced power, ultra‑low noise, and fine‑grain control over gain, filters, and EQ to match your exact gear and taste.

Why Audiophiles Choose This Product

• Strong, engaging sound: Neutral‑to‑slightly‑warm body with tight, punchy bass, clean mids, and relaxed, non‑fatiguing treble. Reviewers praised its “clean, powerful sound from a small package.”
• Engineered for fidelity: Built around ESS’s latest HyperStream IV ES9069Q DAC with dedicated I/V (TI OPA1602 ×2) and low‑noise headphone stages (SGM8262 ×2) in a true balanced architecture for excellent channel separation and low distortion.
• Practical everywhere: Hyper/Standard power modes optimize output and heat, while 100‑step hardware volume and two gain levels make it equally comfortable with sensitive IEMs and tougher over‑ears.
• Broad, reliable compatibility: USB‑C input with UAC 2.0 for up to 32‑bit/768 kHz PCM and native DSD512; switchable to UAC 1.0 for legacy devices and gaming consoles that prefer low‑latency class‑compliant mode. Works with modern Android, macOS, and Windows systems.
• App control that matters: The Cayin Control (Android) app adds a 10‑band parametric EQ, balance, filter selection, power/gain modes, and 100‑step volume—settings are stored in the RU3 itself for use across sources.

What’s Included

• RU3 Portable USB DAC/Headphone Amplifier: ES9069Q DAC, 3.5 mm SE and 4.4 mm balanced outputs (PO/LO shared) with color IPS display.
• USB‑C to USB‑C interconnect cable (short) for phones/tablets/laptops.
• User manual and documentation.

Note: Lightning/USB‑C adapters for older iOS devices are not included.

Technical Specifications

All figures per the RU3 official manual and Cayin product listing.

Professional Recognition

• Reviews: Headfonics concludes, “The Cayin RU3… delivers competitive output power… with clean, high‑quality sound,” and highlights its app integration and drive authority at this size.
• Heritage: Cayin is the hi‑fi brand of Zhuhai Spark Electronic Equipment Co., Ltd., designing acclaimed tube amplifiers and personal audio since 1993—bringing that musical house sound to compact devices like RU3.
• Thoughtful innovation: UAC 1.0/2.0 switching for broader device support, PO/LO mode from both 3.5 mm and 4.4 mm, and Android app‑based parametric EQ are rare at this size and class.

The Bottom Line

Cayin RU3 is the dongle to reach for when you want genuine hi‑fi dynamics and refinement from a phone or laptop, not just “good for a dongle” sound. The combination of ESS’s latest DAC, balanced architecture, robust power on the 4.4 mm output, and smart app control makes RU3 a confident daily driver for both sensitive IEMs and many full‑size headphones. If you’ve been underwhelmed by thin, bright, or underpowered dongles, RU3’s warm‑leaning neutrality, control, and headroom deliver the musical ease and authority you’ve been missing.

Notes for setup and compatibility:

• For Windows 10/11, plug‑and‑play works; Cayin’s optional USB audio driver enables ASIO for advanced apps. macOS and modern Android are driverless. Use UAC 1.0 if a legacy device or console requires it.
• Line‑out (LO) is selectable from either jack and shares the same amplifier path—ideal for feeding powered speakers or external amps on the go.

Turn any source into rich, high‑resolution listening—wirelessly or wired

Stop choosing between convenience and fidelity. Cayin’s BTC‑2 brings true hi‑res Bluetooth to your desk and adds a clean, punchy headphone amp and full DAC hub in one compact, all‑metal chassis. Stream in via LDAC or aptX HD, plug in a coaxial digital source, or feed it analog line‑in—then enjoy balanced 4.4 mm or 6.35 mm headphone output, send line‑level to powered speakers, or even pass digital out to a separate DAC. It’s the small box that brings every source together, without sacrificing sound.

Why Audiophiles Choose This Product

• Primary Benefit: Clean, detailed sound with a natural, non‑fatiguing presentation and a wide, well‑organized stage—impressive for a Bluetooth‑enabled desktop unit. Independent reviewers praise its finesse with strings and vocals and its composure on complex passages.
• Technical Benefit: Proven ESS Sabre ES9018K2M DAC paired with Qualcomm’s QCC5125 Bluetooth SoC and a balanced 4‑channel amplification path, for low noise and precise channel control.
• Practical Benefit: Simple front‑panel controls with a silky ALPS volume potentiometer and a crisp 1.7" white OLED display that shows input, codec, and sample rate at a glance. The detachable SMA antenna optimizes wireless reception.
• Compatibility Benefit: Bluetooth 5.1 (LDAC, aptX HD, aptX LL, aptX, AAC, SBC), S/PDIF coaxial input up to 192 kHz/24‑bit, and stereo RCA line in/out let BTC‑2 integrate with phones, tablets, PCs, TVs/set‑top boxes with coaxial out, and powered speakers.
• Unique Benefit: Acts as a Bluetooth receiver and digital hub—decode to its own headphone/line outputs or forward a Bluetooth stream as coaxial S/PDIF to an external DAC. Few compact units offer both S/PDIF in and out at this price class.

What’s Included

• Main Product: Cayin BTC‑2 Hi‑Res Bluetooth DAC/Headphone Amp (balanced 4.4 mm and single‑ended 6.35 mm headphone outputs; RCA line in/out; RCA coaxial S/PDIF in/out).
• Primary Accessory: USB‑C power cable (5V/1A input). Power adapter not always included; any 5V/1A USB power source works.
• Secondary Items: Detachable “rubber‑duck” SMA antenna for Bluetooth reception; infrared/Bluetooth remote is available and bundled in some regions, but is an optional accessory per Cayin.
• Documentation: User manual and warranty information (regional terms vary).

Technical Specifications

Notes:

• BTC‑2 is a Bluetooth receiver/DAC/amp. It does not transmit Bluetooth audio from wired inputs.
• Some retailers note user‑selectable digital filters (Fast/Slow/Minimum‑phase) accessible via the menu; availability can be region/firmware dependent.

Professional Recognition

• Reviews: Regional reviewers highlight BTC‑2’s “small size, big performance,” calling out airy staging, strong vocal detail, and confident layering—even over Bluetooth.
• Retailer Feedback: Specialty dealers emphasize its rare mix of LDAC reception plus both coaxial S/PDIF input and output, making it a flexible desktop hub.
• Heritage: Built by Cayin (Zhuhai Spark Electronic Equipment Co., Ltd.), a hi‑fi manufacturer established in 1993 with deep expertise from tube amplifiers to modern desktop and portable audio.
• Engineering Touches: ALPS volume potentiometer and robust metal enclosure for EMI shielding and long‑term reliability.

The Bottom Line

If you want simple, stable hi‑res Bluetooth for your desk without giving up the fidelity of a wired DAC/amp, Cayin’s BTC‑2 nails the brief. It consolidates your wireless streaming, digital coax, and analog sources into one elegant box—with balanced headphone drive and the option to feed an external DAC when you’re ready to upgrade further. It’s a thoughtfully engineered, future‑friendly desktop hub from a brand with three decades of audiophile credibility.

Big-stage sound, pocket-size freedom

Turn any phone or laptop into a serious hi‑fi source. Cayin RU3 brings clean, confident drive and a naturally musical tuning to your everyday listening—without the battery drain and bulk of a portable rig. If your pain points are flat dynamics, anemic bass, or hiss with sensitive IEMs, RU3 answers with 560 mW of balanced power, ultra‑low noise, and fine‑grain control over gain, filters, and EQ to match your exact gear and taste.

Why Audiophiles Choose This Product

• Strong, engaging sound: Neutral‑to‑slightly‑warm body with tight, punchy bass, clean mids, and relaxed, non‑fatiguing treble. Reviewers praised its “clean, powerful sound from a small package.”
• Engineered for fidelity: Built around ESS’s latest HyperStream IV ES9069Q DAC with dedicated I/V (TI OPA1602 ×2) and low‑noise headphone stages (SGM8262 ×2) in a true balanced architecture for excellent channel separation and low distortion.
• Practical everywhere: Hyper/Standard power modes optimize output and heat, while 100‑step hardware volume and two gain levels make it equally comfortable with sensitive IEMs and tougher over‑ears.
• Broad, reliable compatibility: USB‑C input with UAC 2.0 for up to 32‑bit/768 kHz PCM and native DSD512; switchable to UAC 1.0 for legacy devices and gaming consoles that prefer low‑latency class‑compliant mode. Works with modern Android, macOS, and Windows systems.
• App control that matters: The Cayin Control (Android) app adds a 10‑band parametric EQ, balance, filter selection, power/gain modes, and 100‑step volume—settings are stored in the RU3 itself for use across sources.

What’s Included

• RU3 Portable USB DAC/Headphone Amplifier: ES9069Q DAC, 3.5 mm SE and 4.4 mm balanced outputs (PO/LO shared) with color IPS display.
• USB‑C to USB‑C interconnect cable (short) for phones/tablets/laptops.
• User manual and documentation.

Note: Lightning/USB‑C adapters for older iOS devices are not included.

Technical Specifications

All figures per the RU3 official manual and Cayin product listing.

Professional Recognition

• Reviews: Headfonics concludes, “The Cayin RU3… delivers competitive output power… with clean, high‑quality sound,” and highlights its app integration and drive authority at this size.
• Heritage: Cayin is the hi‑fi brand of Zhuhai Spark Electronic Equipment Co., Ltd., designing acclaimed tube amplifiers and personal audio since 1993—bringing that musical house sound to compact devices like RU3.
• Thoughtful innovation: UAC 1.0/2.0 switching for broader device support, PO/LO mode from both 3.5 mm and 4.4 mm, and Android app‑based parametric EQ are rare at this size and class.

The Bottom Line

Cayin RU3 is the dongle to reach for when you want genuine hi‑fi dynamics and refinement from a phone or laptop, not just “good for a dongle” sound. The combination of ESS’s latest DAC, balanced architecture, robust power on the 4.4 mm output, and smart app control makes RU3 a confident daily driver for both sensitive IEMs and many full‑size headphones. If you’ve been underwhelmed by thin, bright, or underpowered dongles, RU3’s warm‑leaning neutrality, control, and headroom deliver the musical ease and authority you’ve been missing.

Notes for setup and compatibility:

• For Windows 10/11, plug‑and‑play works; Cayin’s optional USB audio driver enables ASIO for advanced apps. macOS and modern Android are driverless. Use UAC 1.0 if a legacy device or console requires it.
• Line‑out (LO) is selectable from either jack and shares the same amplifier path—ideal for feeding powered speakers or external amps on the go.

Hear your N6iii go reference: greater drive, lower noise, zero compromise

The Cayin E203 unlocks a new tier of clarity, headroom, and control from your N6iii. Built around ESS’s flagship ES9039S PRO and Cayin’s DAO hybrid amp architecture, this second‑generation, tool‑free motherboard elevates both resolution and musicality while keeping output impedance ultra‑low for modern IEMs. If you’ve ever felt you had to choose between black‑background finesse for sensitive earphones and real current for full‑size dynamics, the E203 is the elegant answer.

Why Audiophiles Choose This Product

• Primary Benefit: fast, neutral, and resolving sound with superb staging
  The ES9039S PRO implementation presents a clean, dynamic canvas with tighter bass definition, airier separation, and a larger image versus the stock C201—ideal when you want “studio‑grade” neutrality without harshness. Reviewers consistently note improved layering and refinement.

• Technical Benefit: flagship ESS with fully balanced analog stages
  An eight‑channel independent current output feeds a custom 8‑channel I/V conversion, followed by fully symmetric LPF and buffer stages—an engineering choice that maximizes the 9039S PRO’s linearity and dynamic range.

• Practical Benefit: three amp modes, one card
  Cayin’s Dual Amplifier Operation (DAO) hybrid stage lets you pick Class A, Class AB, or Hyper Mode. Hyper raises bias/current for maximum grip on challenging loads; Class A/AB let you tune warmth vs. battery life on the fly.

• Compatibility Benefit: purpose‑built for N6iii, with tool‑free swapping
  The E203 is a Gen2 audio motherboard designed exclusively for N6iii’s enlarged, shielded bay and quick‑release latch. N6ii cards are not compatible. Cayin’s v1.21 firmware adds dedicated E203 UI/functions.

• Unique Benefit: headphone‑out only, by design
  By omitting line‑out on this card, Cayin concentrates space and power on the headphone path, reducing potential crosstalk and keeping output impedance exceptionally low for IEM synergy.

What’s Included

• Main Product: Cayin E203 Audio Motherboard (for N6iii), ES9039S PRO DAC, DAO hybrid amp with Class A/AB/Hyper
• Primary Accessory: Quick‑start/warranty documentation (contents may vary by region)
• Secondary Items: —
• Documentation: Manufacturer warranty and user guidance provided by Cayin/dealer at purchase

Note: The E203 is an add‑on module for the Cayin N6iii DAP and requires the player to function. No tools are needed for installation.

Technical Specifications

Professional Recognition

• Reviews

  • Headfonia: calls the E203 “more neutral… technically superior,” praising its bigger stage and refined treble versus the C201.
  • Headfonics: highlights E203 as the “card of choice” for IEM users, noting DAO modes and up to 900 mW balanced in Hyper Mode.
  • Twister6: reports strong endurance for a high‑power card and applauds the N6iii/E203 modular concept and included essentials.

• Community Feedback

  • Head‑Fi users describe E203 as “less warm… more neutral,” with audible differences across A/AB/Hyper and excellent synergy with varied IEMs; one calls it “the nicest Sabre implementation I’ve heard.”

• Official Support & Heritage

  • Cayin issued N6iii firmware v1.21 with E203 UI/function support (Dec 26, 2024), underscoring long‑term backing.
  • Cayin, founded in 1993, has earned a reputation for innovative portable and desktop designs, including tube amplification and modular DAPs.

• Design Rationale

  • E203’s headphone‑focused architecture intentionally omits line‑out to reduce interference and crosstalk, concentrating resources on the PO path.

The Bottom Line

If you own a Cayin N6iii and want a more reference‑leaning, high‑current output with an inky background for today’s sensitive IEMs—and enough muscle for many full‑size headphones—the E203 is the drop‑in upgrade that delivers. Its flagship ESS core, fully balanced analog path, and three selectable amp modes combine into a confident, future‑proof tuning tool that complements the N6iii’s modular promise without adding complexity. Install it in seconds, pick your operating class, and hear your library anew.

Notes on validation and accuracy

• E203 hardware, power, impedance, frequency response, distortion, DR/SNR, weight, and battery figures were cross‑checked across multiple authorized dealers and press materials.
• N6iii platform compatibility and firmware support are confirmed via Cayin’s official site.
• Sound character observations reflect consensus across professional reviews and community impressions. Individual pairing may vary.

Recommended for: N6iii owners seeking maximum transparency, selectable warmth/drive, and low‑impedance control—without sacrificing the convenience of a modern Android DAP.

Turn your phone or laptop into a reference-grade source. Cayin’s RU7 delivers the fluid, organic ease audiophiles love from DSD—with the drive and dynamics you need for modern headphones—in a pocketable dongle that respects your battery and your music.

Why it matters

If you’ve tried dongles that sound sterile, hiss with sensitive IEMs, or run out of steam with full‑size cans, the RU7 is your answer. Its discrete 1‑bit DSD DAC architecture converts everything “All‑to‑DSD” before it ever reaches the amplifier, preserving tone and microdetail while keeping background noise vanishingly low. The result is an effortlessly musical presentation—smooth where it should be, incisive where it counts.

Why Audiophiles Choose This Product

• Sound, first: The RU7’s fully balanced, discrete 1‑bit resistor‑network DAC renders timbre with a natural, analogue‑like ease while maintaining excellent transparency and stage depth. Reviewers consistently praise its organic presentation.
• Real engineering: Cayin builds the RU7 around 128 high‑precision thin‑film resistors in a differential 4‑channel DAC topology, followed by a three‑stage active low‑pass filter. All digital audio is converted to user‑selectable DSD64/128/256 before the discrete DAC, mirroring technology from Cayin’s N7 DAP.
• Practical power: Dual amplifiers operating in parallel deliver up to 400 mW into 32 Ω from the 4.4 mm balanced out (160 mW from 3.5 mm SE), with low output impedance for IEM synergy and headroom for many full‑size headphones.
• Everyday compatibility: Low 100–110 mA draw, plus native support for Android, iOS/iPadOS, macOS, and Windows (driver available), make the RU7 easy to live with across devices.
• Uniquely versatile: Both 3.5 mm and 4.4 mm sockets can be configured as fixed‑level line outputs (1.2 Vrms SE, 2.4 Vrms BAL) to feed portable/desktop amps or home systems—no extra dongles required.

What’s Included

• Cayin RU7 portable USB DAC/Headphone Amp: Discrete 1‑bit DSD architecture, dual parallel amplifiers, 3.5 mm SE and 4.4 mm balanced I/O.
• Primary cable: USB‑C to USB‑C OTG cable.
• Adapters & accessories: USB‑A to USB‑C adapter, handmade magnetic leather case, and two adhesive metal plates for secure mounting.
• Documentation: Quick start/user information (Windows USB audio driver available from Cayin’s support page).

Technical Specifications

Notes: Frequency response, SNR, and channel‑separation figures vary slightly by output; consult your dealer’s detailed listing if needed for system matching.

Professional Recognition

• “Organic and analogue‑like with great transparency and technicalities.” — Headfonia on RU7.
• Head‑Fi owners highlight standout timbre, stage, and power; some report mild relay clicks between tracks (a normal byproduct of the DSD/relay design) and increased host battery use—trade‑offs many accept for the sound.
• Heritage: Cayin is the personal‑audio brand of Zhuhai Spark Electronic Equipment Co., Ltd., designing audiophile components since 1993.
• Innovation: RU7 brings Cayin’s discrete 1‑bit DSD architecture—debuted in its N7 DAP—into a low‑power, dual‑PCB dongle with shared line‑out functionality, a rare combination at this size.

The Bottom Line

The Cayin RU7 is for listeners who want portable audio without giving up musicality, headroom, or system flexibility. Its discrete 1‑bit DSD core, smart dual‑amp topology, and shared line‑out blur the line between pocket gear and serious hi‑fi, all while playing happily with your phone or computer. If you’ve been waiting for a dongle that sounds like real hi‑fi, this is the one to beat.

with R‑2R and 1‑Bit DAC

Hear both sides of perfection: warm R‑2R soul and ultra‑clean 1‑Bit precision—instantly, on your N6iii.

If you’ve ever wished you could switch between the analog‑rich flow of an R‑2R ladder and the airy, laser‑etched imaging of a 1‑Bit DSD DAC without swapping gear, the R202 was built for you. Cayin’s modular “audio motherboard” for the N6iii delivers two fully discrete, fully balanced DAC engines on a single board, letting you choose the sonic character that best fits the music, the moment, and your monitors. No compromises, no cables—just tap to select R‑2R, 1‑Bit, or Auto and immerse. Compatible exclusively with the Cayin N6iii (firmware v1.6 or later).

Why Audiophiles Choose This Product

• • Sound, two ways: R‑2R mode wraps you in a saturated, emotive presentation with expansive body; 1‑Bit mode expands space and pin‑point imaging with a cleaner, more linear feel. Switch on the fly or let Auto pick by file format.
• • Discrete engineering that matters: Dual, fully discrete, fully balanced DACs—192 ultra‑precision resistors for the 24‑bit R‑2R ladder and 128 for the 1‑Bit DSD path—feed a quad‑channel, fully balanced headphone amp. Expect low noise, high dynamic contrast, and true left/right symmetry.
• • Practical portability: Purpose‑built for IEMs and easy‑to‑drive headphones with sub‑ohm output impedance and robust power: up to 550 mW balanced, 250 mW single‑ended (32 Ω). No hiss, no fuss.
• • Seamless integration: Quick‑release Gen2 latches make swapping motherboards simple. The N6iii recognizes the R202 after updating to firmware v1.6—then presents the R‑2R/1‑Bit/Auto options in the UI.
• • Built for black backgrounds: Matrix‑structured power, precision analog volume (NJW1195), and premium TI op‑amps (OPA1612/OPA1662/INA1620) maintain purity and drive.
• • All‑day listening: Excellent endurance with the N6iii—up to 16 hours (R‑2R), 14 hours (1‑Bit), and 15 hours (Auto) under benchmark conditions.

What’s Included

• • Main product: Cayin R202 Audio Motherboard for N6iii (dual‑DAC discrete R‑2R + 1‑Bit architecture)
• • Primary accessory: Protective anti‑static packaging (factory presentation)
• • Secondary items: User documentation/quick start guide (region/retailer packaging may vary)
• • Documentation: Warranty information via Cayin/authorized dealer

Note: N6iii player sold separately.

Technical Specifications

Professional Recognition

• Reviews: Headfonics rated R202 highly (9.2/10), praising its “two DACs in one” approach and the excellent staging of 1‑Bit mode with the rich, emotive R‑2R option. They also note PO‑only design and sub‑ohm outputs suited to IEMs.
• Reviews: Twister6 highlights the Gen2 quick‑release latches, black background, and standout battery life with the N6iii, confirming dual‑discrete construction and PO‑only I/O.
• Heritage: R202 follows Cayin’s long‑running modular lineage (from N6ii’s R01 R‑2R card to the N7’s discrete 1‑Bit design), now unified on one board for the N6iii. Official firmware v1.6 adds R202 UI support.
• Community buzz: Early owner discussions compare R202’s lush R‑2R timbre with the cleaner, wider 1‑Bit presentation—most calling it the most musically engaging N6iii board yet for IEMs.

The Bottom Line

The Cayin R202 is the plug‑in answer to a long‑standing audiophile dilemma: Do you want the organic dimensionality of R‑2R or the crystalline imaging of 1‑Bit? With R202 you get both, engineered discretely and balanced front‑to‑back, driven by a quiet, muscular amplifier stage that flatters sensitive IEMs and portable headphones. If you own an N6iii and value choice without clutter, R202 is the definitive sound‑shaping upgrade—purposeful, silent, and endlessly musical. Update your player to firmware v1.6, snap the board in, and rediscover your library two different ways.

Product Type and Fit Guide (for DAC/amp modules)

• Input/Output: PO via 3.5 mm SE and 4.4 mm BAL; no dedicated line‑out or SPDIF on this board. For fixed line‑level or external amps, consider other N6iii motherboards.
• Power/Impedance: Best with IEMs and moderately sensitive headphones; not intended for very demanding, high‑power full‑size planars.
• Features at a glance: Dual discrete DACs (R‑2R and 1‑Bit), analog balanced volume, quick‑release latches, sub‑ohm outputs, long battery life with N6iii.

Notes on compatibility: Works only with Cayin N6iii. Ensure N6iii firmware is updated to v1.6 or newer to access R‑2R/1‑Bit/Auto modes in the Audio Settings.

Turn any source into rich, high‑resolution listening—wirelessly or wired

Stop choosing between convenience and fidelity. Cayin’s BTC‑2 brings true hi‑res Bluetooth to your desk and adds a clean, punchy headphone amp and full DAC hub in one compact, all‑metal chassis. Stream in via LDAC or aptX HD, plug in a coaxial digital source, or feed it analog line‑in—then enjoy balanced 4.4 mm or 6.35 mm headphone output, send line‑level to powered speakers, or even pass digital out to a separate DAC. It’s the small box that brings every source together, without sacrificing sound.

Why Audiophiles Choose This Product

• Primary Benefit: Clean, detailed sound with a natural, non‑fatiguing presentation and a wide, well‑organized stage—impressive for a Bluetooth‑enabled desktop unit. Independent reviewers praise its finesse with strings and vocals and its composure on complex passages.
• Technical Benefit: Proven ESS Sabre ES9018K2M DAC paired with Qualcomm’s QCC5125 Bluetooth SoC and a balanced 4‑channel amplification path, for low noise and precise channel control.
• Practical Benefit: Simple front‑panel controls with a silky ALPS volume potentiometer and a crisp 1.7" white OLED display that shows input, codec, and sample rate at a glance. The detachable SMA antenna optimizes wireless reception.
• Compatibility Benefit: Bluetooth 5.1 (LDAC, aptX HD, aptX LL, aptX, AAC, SBC), S/PDIF coaxial input up to 192 kHz/24‑bit, and stereo RCA line in/out let BTC‑2 integrate with phones, tablets, PCs, TVs/set‑top boxes with coaxial out, and powered speakers.
• Unique Benefit: Acts as a Bluetooth receiver and digital hub—decode to its own headphone/line outputs or forward a Bluetooth stream as coaxial S/PDIF to an external DAC. Few compact units offer both S/PDIF in and out at this price class.

What’s Included

• Main Product: Cayin BTC‑2 Hi‑Res Bluetooth DAC/Headphone Amp (balanced 4.4 mm and single‑ended 6.35 mm headphone outputs; RCA line in/out; RCA coaxial S/PDIF in/out).
• Primary Accessory: USB‑C power cable (5V/1A input). Power adapter not always included; any 5V/1A USB power source works.
• Secondary Items: Detachable “rubber‑duck” SMA antenna for Bluetooth reception; infrared/Bluetooth remote is available and bundled in some regions, but is an optional accessory per Cayin.
• Documentation: User manual and warranty information (regional terms vary).

Technical Specifications

Notes:

• BTC‑2 is a Bluetooth receiver/DAC/amp. It does not transmit Bluetooth audio from wired inputs.
• Some retailers note user‑selectable digital filters (Fast/Slow/Minimum‑phase) accessible via the menu; availability can be region/firmware dependent.

Professional Recognition

• Reviews: Regional reviewers highlight BTC‑2’s “small size, big performance,” calling out airy staging, strong vocal detail, and confident layering—even over Bluetooth.
• Retailer Feedback: Specialty dealers emphasize its rare mix of LDAC reception plus both coaxial S/PDIF input and output, making it a flexible desktop hub.
• Heritage: Built by Cayin (Zhuhai Spark Electronic Equipment Co., Ltd.), a hi‑fi manufacturer established in 1993 with deep expertise from tube amplifiers to modern desktop and portable audio.
• Engineering Touches: ALPS volume potentiometer and robust metal enclosure for EMI shielding and long‑term reliability.

The Bottom Line

If you want simple, stable hi‑res Bluetooth for your desk without giving up the fidelity of a wired DAC/amp, Cayin’s BTC‑2 nails the brief. It consolidates your wireless streaming, digital coax, and analog sources into one elegant box—with balanced headphone drive and the option to feed an external DAC when you’re ready to upgrade further. It’s a thoughtfully engineered, future‑friendly desktop hub from a brand with three decades of audiophile credibility.

Harness Planar-Level Power, With Studio-Quiet Control

If you love the speed, slam, and scale of modern planars—and want them to sound alive rather than polite—the Cayin IHA‑6 delivers the current, headroom, and control that demanding headphones crave. Its fully balanced, all‑discrete architecture and High/Low Current + Gain options let you match the amp to your headphones instead of the other way around, unlocking deeper dynamics and blacker backgrounds from your favorite DAC and recordings.

Why Audiophiles Choose This Product

• • Powerful, controlled sound: Up to 7 W per channel into 32 Ω from the balanced outputs gives planars the grip and dynamics they’re built for—without etch or glare. Many listeners report excellent authority even with notoriously tough models.
• • Engineering that serves music: A fully balanced, quadruple‑amplifier circuit built from discrete parts, with independent L/R power supplies, keeps crosstalk and noise vanishingly low for effortless detail retrieval.
• • Practical flexibility at your fingertips: Two gain settings and switchable High/Low Current modes tailor drive for both sensitive dynamics and hard‑to‑move planars; separate low‑ and high‑impedance 6.35 mm jacks expand matching options.
• • Broad connectivity, zero guesswork: Balanced XLR and RCA inputs plus four headphone outputs (dual 3‑pin XLR, 4‑pin XLR, and two 6.35 mm) cover nearly any cable you own—no adapters required.
• • Thoughtful parts selection: Premium ALPS 4‑channel potentiometer, Toshiba audio‑grade FETs, and a low‑resistance MOSFET output stage contribute to smooth control, low noise, and long‑term reliability.
• • Output impedance options done right: The two single‑ended jacks are purpose‑tuned—Low ≈10 Ω and High ≈120 Ω—while the balanced outs are near‑zero, letting you shape synergy (e.g., classic Sennheiser/ZMF on 120 Ω, planars on balanced).
• • Desktop‑friendly build: A dense, resonance‑controlled aluminum chassis with sandblasted finish looks clean in any setup while shielding circuits from interference.

What’s Included

• • Cayin IHA‑6 amplifier (iHA‑6)
• • Power cable
• • Replacement fuses (x2)
• • User manual and warranty card
  Official package contents may vary by region; this list reflects the manufacturer’s documentation.

Technical Specifications

Practical notes:

• The IHA‑6 is a dedicated headphone amplifier with no pre‑amp/line outputs, by design. Pair it with your preferred DAC.

Professional Recognition

• Reviews
  • The Absolute Sound praised Cayin’s i‑Series as “impressive personal audio components,” noting the IHA‑6’s balanced/SE I/O and flexible High/Low Current + Gain operation.
  • Headfonics highlighted the IHA‑6’s 7 W balanced drive and discrete, fully balanced design, recommending it for planars.
  • Measurement‑driven validation from GoldenSound confirmed near‑zero balanced output impedance and power figures aligning with spec.
• Community feedback
  • Head‑Fi veterans reported the IHA‑6 driving HE‑6 with rare authority for its size; many found balanced “exceptional.”
• Heritage
  • Cayin (Zhuhai Spark) has built Hi‑Fi electronics since the 1990s; the IHA‑6 sits in the brand’s minimalist, stackable i‑Series alongside the iDAC‑6 and iDAP‑6.
• Design details
  • Premium ALPS 4‑channel pot, Toshiba audio‑grade FETs, and a low‑resistance MOSFET output stage underscore the amp’s low‑noise, high‑current intent.

The Bottom Line

The Cayin IHA‑6 is for listeners who want desktop‑friendly refinement with big‑amp composure. Its combination of honest measurements, real‑world driving power, and connection flexibility builds confidence—especially with planars—without adding coloration or complexity. Choose your gain/current setting, pick the jack that best suits your headphone’s impedance behavior, and enjoy a clear, dynamic window into your music for years to come.

Notes for amplifier shoppers:

• Inputs/Outputs: RCA and XLR in; headphone outs include dual 6.35 mm (10 Ω/120 Ω), dual 3‑pin XLR, and 4‑pin XLR. No DAC or pre‑out—add your preferred DAC upstream.
• Power and matching: For low‑impedance planars, use balanced outputs and experiment with Current modes; for high‑impedance dynamics (e.g., 300 Ω), High Gain with balanced out provides excellent swing. The 120 Ω jack can add warmth/body to certain classics by design.

Hear more of your music, for longer – effortless clarity with black‑silence backgrounds

Unlock the full potential of your Cayin N6iii with C201, a swappable audio motherboard engineered for vanishing‑low noise, superb channel separation and long, cool‑running sessions. Built around eight Cirrus Logic CS43198 DACs working in a parallel full‑differential matrix and a high‑precision analog stage, C201 delivers a neutral‑natural presentation with airy treble, lifelike mids, and punchy, controlled bass—without the fatigue or heat that can cut listening short.

Why Audiophiles Choose This Product

• The sound you’ve been chasing

  • Balanced, transparent tuning with excellent layering and a black background that flatters both sensitive IEMs and full‑size headphones. Reviewers describe it as a “balanced, natural to neutral sounding motherboard.”

• Engineered for low noise and precision

  • Parallel full‑differential matrix DAC: 8× CS43198 in mono, four per channel, synchronized via the N6iii’s FPGA for lower distortion and higher density. Four NJU72315 chips implement a cascade passive volume control for ultra‑fine, channel‑consistent steps. Headphone drive comes from four TI OPA1622 op‑amps in high‑current parallel configuration.

• Practical, everyday usability

  • Cool operation and excellent battery performance on the N6iii platform (up to 14.2 hours SE, 12.4 hours balanced), plus precise low‑volume balance for sensitive IEMs.

• Seamless device compatibility

  • Purpose‑built for the Cayin N6iii’s second‑generation modular bay with a quick‑release, tool‑free locking mechanism. Note: Gen‑2 motherboards (like C201) are not backward‑compatible with N6ii.

• Thoughtful connectivity

  • Dedicated 3.5 mm line‑out, separate 3.5 mm headphone out, and a shared 4.4 mm balanced PO/LO—so you can run IEMs, headphones, or feed an external amp with fixed line level.

What’s Included

• C201 Audio Motherboard
  • Second‑generation swappable DAC/amp module for Cayin N6iii with 8× CS43198 DACs.
• Documentation
  • Quick start/warranty information (contents may vary by region).

Technical Specifications

Professional Recognition

• Reviews

  • Headfonics: calls C201 a “balanced, natural to neutral sounding motherboard,” praising its wide imaging and low noise floor with sensitive IEMs.
  • Headfonia: highlights N6iii’s “dynamic, detailed sound,” strong usability and modular design; offers specific sound notes for C201 vs E203.
  • Twister6: details C201’s engineering—8× CS43198 matrix, 4× NJU72315 cascade volume, 4× OPA1622 high‑current parallel—and documents real‑world power/output behavior.

• Community feedback

  • Head‑Fi user impressions consistently note the C201’s deep soundstage, black background, and strong everyday pairing flexibility.

• Heritage

  • Built by Cayin (Zhuhai Spark Electronic Equipment Co., Ltd.), the N6iii platform and its audio motherboards are part of the brand’s ongoing modular DAP roadmap, shown across official communications and firmware support.

• Innovation

  • Second‑generation, quick‑release audio motherboard system with larger PCB real estate and automatic module detection on the N6iii platform.

The Bottom Line

C201 is the “do‑everything‑well” motherboard for N6iii owners who want reference‑grade neutrality, superb separation, and all‑day stamina. Its parallel CS43198 matrix and precision analog stage deliver a clean, musical, and fatigue‑free listen, while the dedicated 3.5 mm line‑out and shared 4.4 mm PO/LO make it easy to integrate into portable or desktop chains. If you value long sessions, black backgrounds, and honest tonality—without sacrificing flexibility—C201 is the smart, future‑forward upgrade for your N6iii.

Notes on compatibility: C201 is designed exclusively for the Cayin N6iii Gen‑2 modular bay and will not fit the earlier N6ii. Always update N6iii firmware to the latest version for best performance and module recognition.

Imagine a portable player that adapts to your music instead of forcing your music to adapt to it. With the N6iii fitted with Cayin’s R202 Audio Motherboard, you get the warmth and dimensionality of a discrete R‑2R ladder for PCM and the purity of a discrete 1‑Bit DAC for DSD—instantly selectable, or automatically chosen per track. It’s the soul of a high‑end desktop rig, made pocketable and effortless.

Why Audiophiles Choose This Product

• • Sound, tailored by format: Dual fully discrete DAC architectures—24‑bit balanced R‑2R for PCM and 1‑Bit balanced DAC for DSD—deliver format‑true timbre and staging. Auto Mode selects the optimal DAC per file so you hear PCM and DSD as they were meant to be heard.
• • Engineering depth that matters: The R202 is built around 320 ultra‑precision 0.1% thin‑film resistors (192 for the R‑2R lattice; 128 for the 1‑Bit DAC), a quad‑channel fully balanced amplifier using TI OPA1612/OPA1662/INA1620, and a 256‑step NJW1195 analog volume control for micro‑exact level matching.
• • Everyday practicality: Phone‑out only (no line‑out) keeps the signal path short and focused for headphones and IEMs. Output impedance stays ultra‑low (≈0.8Ω BAL / 0.5Ω SE) to preserve your IEM’s tuning.
• • Platform power and streaming freedom: Android 12 with Snapdragon 665, 6GB RAM, 128GB storage (plus microSD up to 2TB), Wi‑Fi 2.4/5GHz, and Bluetooth 5.0 with LDAC/UAT make the N6iii fast, app‑friendly, and ready for lossless streaming. Cayin’s DTA bypass preserves bit‑perfect playback across apps.
• • Unique among DAPs: Second‑generation, tool‑free modular audio bay lets you change the N6iii’s sonic personality in seconds; firmware v1.6 adds native UI and feature support for the R202.

What’s Included

• • Main product: Cayin N6iii Digital Audio Player with R202 Audio Motherboard pre‑installed (quick‑release, tool‑free module system).
• • Primary accessory: USB‑C to USB‑C cable (charging/data/USB audio).
• • Secondary items: PU leather case; screen protectors.
• • Documentation: Printed user manual and warranty; R202 module documentation/antistatic packaging.

Note: Contents can vary slightly by region; check your retailer’s listing for the exact bundle.

Technical Specifications

Specifications compiled from Cayin’s official materials and specialist retailers/reviewers. Reviewer testing has reported up to ~16.5 hours continuous loop playback with R202 under specific conditions; your runtime will vary with gain, file type, and output.

Professional Recognition

• • Reviews:
  • “Phone‑out only, purpose‑built for pure output” and a dual‑DAC design that supports up to PCM 768 kHz / DSD512 processing—with notably strong battery life measured in testing.
  • Multiple reviewers praise the in‑box leather case, quality USB‑C cable, and overall ergonomics—rare at this level.
  • Headfonia highlights Cayin’s maturing Gen2 modular ecosystem around N6iii, from the stock C201 to higher‑performance boards—R202 adds the discrete DAC option enthusiasts asked for.
• • Heritage: Cayin is the personal‑audio brand of Zhuhai Spark Electronic Equipment Co., Ltd., designing hi‑fi components since 1993 with deep R&D across desktop and portable categories.
• • Ongoing innovation: Official firmware v1.6 introduced native R202 UI and feature support on N6iii, underscoring Cayin’s active post‑launch development.

The Bottom Line

N6iii with the R202 motherboard is for listeners who won’t compromise between the organic, “analog‑like” flow of R‑2R PCM and the crystalline directness of true 1‑Bit DSD. It marries serious circuitry—discrete dual DACs, differential amplification, precision analog volume—with a modern Android platform and a modular bay that lets you evolve your player over time. If you want a portable that feels custom‑tuned to each format and each pairing, this is the elegant, future‑proof way to get there.