I am more than willing to share more info!
Just wanted to make sure its the right place to do it...
here is what sets our system apart...
We have designed a new DAC working with any SBC/RPI (i2s)
We are using 2 DAC ics PCM5142 with integrated DSP. The PurePath software from TI is available for download (registration required) and can be used to create specific filters and other audio functions.
The board will come pre programed as a 2.1 output (but you can create your own custom design and load it the board and can access the xover frequency directly from linux (we made a small app)
Hardware wise , we have split the digital and analog side with LDOs and we feed the analog side using an extremely capable (low noise ultrahigh psrr) LT3042. Basically each board has 4 LDO (2 for each DAC ic) (note that digital side uses cheaper LDOs)
Of course , on the analog side we used only thin film resistors and poly caps in audiopath.
This DAC has RCA outputs but also a small connector that will connect to our TPA3118 AMP shield (only LR)
I am including a video of the Purepath so you can see the capabilities of soft. We are able to have 4 poles crossover filters , volume etc for files that are 24/192Khz
We send only HPF frequency's over 80Hz (chose from 60-150Hz) to main speakers and rest LPF to subwoofer.
Its hard to explain the sound improvement , but he unit sounds clean , effortless .
Also, in the past few months we have worked very hard on a new shield for RPIs/SBCs.
Basically the main idea belongs to Ian's. His hardware is actually superior to ours , mostly in the way he implemented the clocks and to the attention of the detail (like mounting xtals on a pcb supported by elastics ). So we credit Ian's idea and his great design.
Our hardware/soft is not a copy , its an implementation of the same idea. We use a FPGA and sram to buffer the DATA and we reclock bclk/mclk outside the FPGA using NDK (or Crystek) . The board has an eprom but its not HAT complaint (because of the space). FCC will be available for the board.
Main reason for making the board was to try to correct the audio clocks of SBCs and bring high quality audio to anyone that has an SBC around..for a great price.
You can use our own SPARKY single board computer or the RPI along with our VOLT amp to have a complete system