Audioengine D2 Wireless DAC Sender-Receiver

Fabulous Wireless Sender-Receiver 

I used to stream digital music from the Mac Pro in the office via a glass optical cable (Toslink), into the Audioengine Sender, then wirelessly one floor down to the Receiver in the living room, then into my own DAC (using optical output of the Receiver) and then into the Amp. Controlled Mac via Splashtop on the iPad (or controlled Spotify via iPhone). Works flawlessly.  Have purchased an expensive network streamer, so don't need this anymore, but it was flawless as a transmitter. The DAC is good, see online reviews.  Will bubble wrap, no original box.

DAC type

Dual Mode USB and Optical (SPDIF) wireless DAC

Inputs

USB/Optical (SPDIF)

Outputs

RCA Stereo/Optical (SPDIF)

D/A converter

PCM1792A

USB controller

TI1020B

Output impedance

100 ohms

Power source

Sender: USB 5V or included external supply 
Receiver: Included external supply

Power requirements

Sender: 270mA, 5V 
Receiver: 300mA, 5V

USB power filtering

3-stage redundant regulation

SNR

(DC to 20 kHz) >115dB

THD+N

(1kHz FS 96kS/s) <0.0015%

Crosstalk

<-85db

Frequency response

10Hz-30KHz (+/- 0.5dB)

Input bit depth

24 bit (upsampled)

Input data rate

96kHz - native playback
44.1kHz, 48kHz, 188.2kHz, 192kHz - re-sampled to 96kHz for playback

Wireless range (typical)

>100ft

Latency

<20ms

Receivers supported

Up to 3

Product dimensions

4.75x5.5x1"

Included accessories (D2 Sender)

Power adapter with detachable AC cord Sonicwave Glass Toslink Cable 10 ft

Included accessories (D2 Receiver)

RCA cable, 6.5ft 
Power adapter with detachable AC cord 

Advantages of wireless

The D2 wireless system transmits bit-perfect PCM-stereo simultaneously to up to 3 receivers. This PCM stream is routed from/to the various components of the system (optical transmitter/receiver, USB controller, and DAC) via the I2S bus, which maintains data integrity throughout the system. Because the various source/sink components are segregated by the wireless subsystem, various anomalies which plague many wired DACs such as jitter, grounding, and induced cable noise are greatly reduced. In addition, the D2 allows the user to physically isolate a potentially noisy computer from the sensitive audio components in your system.

D2 USB

The D2 utilizes the TI1020B USB controller chip, widely recognized as the industry standard for higher-end USB audio products. The Sender can be powered directly from the USB bus or from the included external power adapter. The USB power is passed through two stages of regulation to ensure high stability and low noise.

D2 DAC

The D2 Receiver utilizes the PCM1792 DAC, widely know for it's low noise and high fidelity. Due to the PCM1792's high signal-to-noise specs and the added benefit of triple redundancy power source conversion and filtering, the D2 presents impressive low noise and low distortion characteristics.

I2C Volume Control

The D2 incorporates a separate-path wireless channel to transmit volume information from the Sender volume control to the analog section of the Receiver. This means that the volume information never affects the digital audio stream.

D2 and LAN

The D2 system divides the band between 2405 MHz and 2477 MHz into 37 discrete, 2 MHz wide channels. Channels numbered 2 through 38 inclusive are used for system operation. The system scans the spectrum and selects two channels that are 18 channels (or 36 mHz) apart and transmits with 50% of the time on one channel (for example channel 2) and 50% on the other channel (for example channel 20). The system stays on these selected channels until the error detection rate reaches a pre-determined level indicating deteriorating RF conditions. The system will then select a cleaner channel for transmission and move there without any drop in audio. In this way the D2 not only maintains it's own audio integrity, but co-exists nicely with other LAN devices.