UHA-4
USB DAC/Amp in Slimline Case with Digital Volume Control and Crossfeed

$199

$10 domestic shipping

$40 international shipping

The op-amp is the amplifier chip. We recommend the AD8610.

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The AD8610 gives best overall performance and battery life for all types of headphones.

In stock

Available to ship: 1 to 3 days

Silver panels are temporarily sold out.

Features

  • USB and analog inputs
  • High-quality digital-to-analog converter
  • High-power, low-distortion amplifier output
  • Digitally-controlled volume for precise channel balance
  • Adjustable crossfeed for more natural soundstage
  • Works with Mac, PC, or any headphone/line output
  • Rechargeable battery
  • 30-day audition period and 2-year warranty

Features

  • USB and analog inputs
  • High-quality digital-to-analog converter
  • High-power, low-distortion amplifier output
  • Digitally-controlled volume for precise channel balance
  • Adjustable crossfeed for more natural soundstage
  • Works with Mac, PC, or any headphone/line output
  • Rechargeable battery
  • 30-day audition period and 2-year warranty

Carry it in your pocket.

At less than 1/2 inch thick, the UHA-4 is our slimmest amplifier. The low-profile controls make it easy to tuck the amp into a pocket and take it along. The internal rechargeable battery provides up to 24 hours of amplification using the line input. With USB connected, you can charge the battery and listen to music simultaneously, either from USB or the line input.

Stay centered.

Unlike analog volume potentiometers, which can sound unbalanced at some settings, the UHA-4’s digitally-controlled volume maintains precise matching between the left and right channels. It uses a series of discrete resistors to keep the image stable and centered at any volume setting. With 2-dB steps and two levels of gain control, you are guaranteed smooth and accurate volume adjustments at any gain level.

Change your soundstage.

In a natural acoustic environment, low-frequency sounds are able to diffract (or “bend”) around the head, and we end up hearing those sounds with both ears. Not so with headphones — a low-frequency sound in one channel is only heard by the corresponding ear. With some recordings, this can create an unnatural experience, causing fatigue over time. The UHA-4 includes a crossfeed feature which allows you to blend some of the low-frequency sound from each channel into the opposite ear, creating a more natural soundstage.

Compatibility

iOS

Supports analog connection from headphone output or line out dock (LOD) to line input.

Android

Supports analog connection from headphone output to line input.

Mac

Supports USB digital interface with sample rates up to 48kHz/16-bit using built-in operating system drivers (USB Audio Class 1.0).

Windows

Supports USB digital interface with sample rates up to 48kHz/16-bit using built-in operating system drivers (USB Audio Class 1.0).

Windows is a registered trademark of Microsoft Corporation in the United States and other countries.

Apple and Mac are trademarks of Apple Inc.

Android is a trademark of Google Inc.

Reviews

Included in the Box

  • UHA-4 DAC+Amp
  • Micro USB cable, 3 feet (1 meter)
  • Velvet carrying pouch
  • Self-adhesive rubber feet

Specifications

Inputs

Analog (stereo 3.5 mm), Micro USB

Gain

Low-gain setting: -6 dB at full volume setting

High-gain setting: +10 dB at full volume setting

Volume Control

Digitally-controlled, 2-dB steps

USB Sample Rate

Up to 48kHz/16-bit

DAC Chip

Texas Instruments PCM2706

Max Output Power

16 ohms: 20 mW

32 ohms: 40 mW

100 ohms: 50 mW

300 ohms: 15 mW

(Measurement conditions: Analog input at 1 kHz, output <1% THD)

THD+N

32 ohms: <0.025% at 1 mW

100 ohms: <0.025% at 1 mW

(Measurement conditions: Analog input at 1 kHz, 20 Hz to 20 kHz bandwidth, no weighting)

Frequency Response

13 Hz to 22.5 kHz, ±1.0 dB

Output Op-Amps

Standard: Analog Devices AD8610 (non-replaceable)

Internal Power Supply

±5 V, ground-centered, switching converter + low-pass filter

Battery life

Analog input: Up to 24 hours

Output impedance

<0.5 ohm

Enclosure

Single-piece extruded aluminum body, stamped aluminum end panels, scratch-resistant photo etching

Dimensions

2.8 x 3.5 x 0.47 inches (70 x 89 x 12 mm)

Performance specifications given for standard AD8610 op-amp.

User Guide