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Starting At $249 $199
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Supports iPhone, iPad, Windows, Linux, and OS X

C5D is built for portable users who demand maximum audio quality, exceptionally low noise, sufficient output power, and a super fine volume control to handle sensitive headphones and IEMs


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A high-performance, portable digital-to-analog converter and headphone amplifier featuring digital volume control, multi-position bass boost, and dual gain.


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Asynchronous and Galvanically Isolated

C5D is a high-performance portable headphone amplifier featuring digital volume control, multi-position bass boost, dual gain, and asynchronous digital-to-analog conversion compatible with iPad, iPhone, and all UAC1 compatible operating systems.

Perfect Channel Balance

Digital stepped attenuation with zero-crossing detection and 1dB attenuation steps provide smooth volume adjustment at all volume levels, even with sensitive IEMs.

Dual LDO Regulation

High performance audio starts with clean power. Supply rails are filtered by impressive TPS7A4700 and TPS7A3301 regulators to achieve ultra low supply noise at a constant output voltage of +/-7V.

Smart USB Charging

Powered by a large 1200mAh Li-Ion battery, C5D quickly charges from any USB port (computer, tablet charger, cell phone charger, etc.). A single LED indicates battery status: solid green while on, blinking while battery is low, or blue while charging.

Configurable Sound

C5D features dual gain levels and a multi-position bass boost toggle for highly customizable sound.

Low Jitter

C5D's asynchronous PCM5102A DAC operates with ultra low jitter, symmetrical pairs measuring below -112dB.

Low Output Impedance

C5D's extremely low output impedance of 0.62 ohms ensures natural frequency response with all headphones.

Tech Specs

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Amplifier Performance

Frequency Response +/- 0.1 dB (20Hz-20kHz)
THD+N (20-20kHz, 150 Ω) 0.0015%
THD+N (20-20kHz, 32 Ω) 0.0045%
Noise -105 dBu
Crosstalk @ 150 Ω -67 dB
Inter-channel Phase @ 1kHz +/- 0.01
Channel Balance +/- 0.55 dB, all volume positions
Max Output @ 600Ω 4.146 VRMS
Max Output @ 150Ω 3.580 VRMS
Max Output @ 32Ω 1.182 VRMS
Power Supply 14.0 Vpp
Output Impedance 0.62 Ω
Battery Run Time 6-8 Hours*
Charge Time 2-4 Hours*

Feature Characteristics

Digital Stepped Attenuation 63 steps + mute
Dual Gain 2.3x and 6.5x
Bass Boost Off / Med / High
Low Battery Indication @ 20 Minutes
Thin Film Resistors 0.1% Tolerance
Battery 1200mAh, 3.7V Li-Ion


Analog Input 3.5mm
Digital Input USB
Output 3.5mm
Charging USB

DAC Performance

Frequency Response +/- 0.14 dB
THD+N 100 Hz 0.0014%
THD+N 20 Hz 0.0015%
THD+N 10 kHz 0.0025%
IMD CCIF 19/20 Khz 0.0015%
Noise A-Weighted -103 dBu
Dynamic Range > 109 dB A-Weighted
Linearity Error -90 dBFS 24/96 0.2 dB
Crosstalk -10dBFS -80 dB
Sum of Jitter Components @ 11025 Hz -112 dB
PCB Stackup 4 Layers
Maximum Output Line Out 100K 2.0 VRMS

Data Support

Audio Formats 16/44, 16/48, 16/88, 16/96, 24/44, 24/48, 24/88, 24/96
Interface USB, Audio Class 1
Native Driver OS Support Windows XP & Later, OS X x86, Linux, iOS 7

DAC Compatibility

iPhone YES: Requires iOS7+ and CCK
iPad YES: Requires CCK
Windows YES
Linux YES
Android YES: Requires v5.0+ and OTG Cable


Case Dimensions (mm) 99.5 x 61.5 x 14.0
Weight 4.2oz


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Package Contents


We recommend the following third-party accessories for use with C5D (not included):

iPad or iPhone with 30pin Connector: Apple Camera Connection Kit
iPad or iPhone with Lightning Connector: Apple USB Camera Adapter
Android Devices: Micro-to-Mini USB OTG Cable

Select Configuration