you don't need the "Pace Car" which weighs in at $1250 USDPace Car Reclocker > Products : Empirical Audio
you can get the Pop Pulse box for about $100 USD
the Pop Pulse SPDIF-II ( otherwise known as SP-II or PC Link-II ) USB to spdif digital transport.
The SP-II is a very neat little box of tricks. When plugged into the USB port of a PC, music played back through the PC is fed into the device in the form of a digital audio stream. The SP-II takes this digital stream from the USB port,cleans it up and then outputs it into a pristine, clean, "jitter" free digital spdif data stream that can be fed directly into the Valab or indeed any DAC.
The SP-II is highly flexible in that as well as having coaxial rca, optical toslink and balanced digital xlr spdif outputs, it also features an I2S output.
DACs fed a I2S signal are supposed to offer a slight improvement in sound quality compared to being fed a spdif signal.
I2S eliminates time related errors that cause "jitter" (a certain type of audio distortion). Usually the lower the "jitter" rate, the more "analogue" a device sounds as opposed to sounding harsh and "digital".
The SP-II also features digital coaxial rca and toslink inputs.
Build quality is exceptional. A much better specced and more reliable + flexible solution to the Trends Audio UD10 or UD10.1
* SPDIF Input - Output 24-96kHz
* USB Input - 24-48kHz
* C-Media CM-108 Chipset
* Pulse isolation transformer ( reduces common mode noise and EMI )
* Plug-and-Play with Windows and Mac machines
* The unit can either run on power provided via USB or a supplied 12VDC power supply