Parasound Zdac v.2 DAC & Headphone Amp

Current model Parasound Zdac v.2 DAC & Headphone Amp that retails for $549. Asking half price.

Effectively new (5 hours? Maybe 10?) with box, manual, packaging, etc.  Even has clear protective covering over screen!  Only rating 9/10 because it is not - technically - new.

Selling because new streamer/server requires USB3 connection (grrr).

My loss = your gain!

Details from Parasound:
Analog volume control for RCA and XLR outputs
Separate volume control for the headphone Jacks
Digital audio connection to LightingTM jack-equipped Apple® devices (USB adapter required)
Updated headphone amp with increased gain
1/4" and 1/8" 24k gold plated headphone jacks
12V input and output triggers
Volume control lock out switch
Premium Analog Devices AD1853 24-bit/192 kHz Digital to Analog Converter IC
All inputs feature jitter reduction and are re-clocked and up-sampled to 422 kHz / 24 bit
USB input for playing music from PC or Mac (driver-less for easy setup)
Asynchronous sample rate conversion for all inputs including the USB input
Works with any format file on your computer up to 96 kHz / 24 bit
Optical and Coaxial digital inputs for use with any standard digital connection
RCA unbalanced and XLR balanced analog outputs
High current headphone output with volume control can drive any headphones from 32 to 600 ohms
Oversized internal toroid power transformer (not a wall wart like many competitors)
Will always power back up to the same input in the event of an AC power outage

Specs:
Supports Incoming Digital Word Lengths: 
16 bit - 24 bit Supports Incoming Digital Sampling Frequencies:
Opt & Coax: 8 kHz, 11.025 kHz, 16 kHz, 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz. 
USB: 44.1 kHz, 48 kHz, 88.2 kHz and 96 kHz Upsampling Frequency: 
422 kHz / 24 bit (all inputs) USB Streaming Controller: 
Texas Instruments TAS1020B Sample Rate Converter: 
Analog Devices AD1895 D to A Converter: 
Analog Devices AD1853 Headphone Amplifier: 
Texas Instruments TPA6120 Frequency Response: 
20 Hz to 20 kHz ±0.2 dB Channel Balance: 
< 0.05 dB, 20 Hz - 20 kHz Channel Separation: 
> 95 dB, 20 Hz - 20 kHz Signal to Noise Ratio: 
110 dB, A-weighted THD + Noise: 
< 0.015 % Audio Output Level, RMS (maximum): 
Unbalanced Variable: 2.4 V 
Balanced Variable: 4.8 V 
Unbalanced Fixed: 2.2 V 
Balanced Fixed: 4.4 V Output Impedance: 
Line out: 160 ohms, unbalanced or balanced 
Headphone out: 10 ohms AC Power Requirement: 
110-130 VAC 60 Hz or 
220-240 VAC 50 Hz (voltage is selected on the chassis bottom) 
Operating: 10 watts 
Standby: < 1 watt Dimensions:
Width: 8.5" (220 mm) 
Depth: 10" (254 mm) 
Height: 2" (51 mm) with feet, 1.75" (45 mm) without feet Weight: 
Net: 5 lbs (2.3kg) 
Shipping: 8 lbs (3.7kg)

Details from Audio Advisor:
Superior Parasound Performance and New Money-saving Functionality
With the original Zdac, Parasound set a new standard for D to A converter performance and value. The new Zdac v.2 builds on the Zdac's widely acclaimed sound quality with important new features. Parasound has added a separate analog volume control for its line outputs so you can now connect the Zdac v.2 directly to a power amp and save the expense of a preamplifier. And Parasound made the headphone amp even more potent with both 1/8" and 1/4" headphone jacks and its own volume control.

The Zdac v.2 has a 12V trigger input so that it can be turned on and off automatically and a powered 12V output to trigger a power amp on and off. A rear panel variable-fixed switch for the line outputs lets you select variable output for when the Zdac v.2 drives a power amp directly, or a fixed output level for when it drives a separate preamp or whole-house audio system.

The Zdac v.2 sounds natural and less 'digital' than more expensive DACs thanks to Parasound's asynchronous sample rate converter. A precise re-clocking system eliminates bitstream-contaminating jitter that's picked up along the digital signal chain. Unlike many other DACs, the Zdac v.2 eliminates jitter on all of its inputs, not only the USB input.

The incredible sound is accomplished through the synergy of two premium parts, an Analog Devices AD1895 sample rate converter and its companion AD1853 DAC, the same DAC that Parasound selected for its Halo CD 1 CD player.

The Zdac v.2 headphone amp is based on the superior Texas Instruments TPA6120. Its current-feedback design and extremely high slew rate prevent odd order distortions and any trace of listening fatigue. Virtually instantaneous response to musical dynamics doesn't come at the expense of its noise floor or signal to noise ratio. Its output impedance is very low and its high gain drives even 600 ohms cans with ease.

The Zdac v.2 accepts 24 bit word lengths and all sampling rates up to 192 kHz on S/PDIF and Optical and 96 kHz on USB. Signals are reclocked and then upsampled to 422 kHz for vivid and effortless reproduction.

High Capacity Power Supply
Most mid-priced DACs use a small external switch-mode 'wall wart' power adaptor. The Zdac includes a built-in low noise linear power supply with a high capacity toroid power transformer for the cleanest possible sound, incredible dynamic range and high-impact bass response.

Balanced Outputs and Dedicated Headphone Stage
The Zdac v.2 lets you take maximum advantage of its sonic excellence, letting you experience its sound via both balanced XLR outputs and unbalanced gold-plated RCA jacks.

The Zdac v.2 headphone output is driven by a dedicated low-noise/high current amplifier that will drive nearly any high quality headphone with ease.

The Zdac v.2 includes fast-acting muting relays, usually found only on premium priced DACs, to eliminate any hint of transient pops or thump noises during turn on/off and when selecting inputs. Custom installers will appreciate that the Zdac v.2 immediately powers back up to the same input in the event of an AC power outage.