Audioengine D1 Headphone Amplifier / Preamplifier / DAC - reduced

Excellent condition. Original owner. I'm including a set of 4 Sorbothane footers for desktop use. ($20 value).  
Features:
- AKM AK4396 digital-to-analog converter for low-noise, high-fidelity stereo sound - built-in high-performance headphone amplifier (20 ohm to 300 ohm headphone impedance recommended) - powered by USB connection — no need for external power supply when connected to a USB source (using optical input requires optional AC USB power adapter or connection to a computer's USB port)  - double regulated USB power ensures no USB bus power
variations affect audio output - compact design for portability - 1 USB (Type B) input for connection to a PC - 1 optical digital (Toslink) audio input  - 1 pair of high-quality RCA audio outputs  - minijack (3.5mm) headphone output  Supported sample rates: USB: up to 96kHz optical digital: up to 192kHz input bit depth: up to 24-bits - built-in driver for USB connection -  frequency response: 10 to 25kHz (±0.5 dB)  - THD: less than 0.0025% - signal-to-noise ratio (DC to 20kHz): greater than 110 dB -  full scale output: 2V RMS -  3-9/16"W x 1-1/16"H x 2-15/16"D (5-1/4"D including cable and volume knob) 
Includes: 
- D1 Digital to analog converter - 24" USB cable (USB Type-A on one end and USB Type-B on the other)  - Cloth drawstring bag -  Setup guide Audioengine -  product brochure 

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