So I've made my decision. Have asked Poland to change my GA TRP engine 53 to R2R. Here's some of my thoughts behind my decision.
My music is mainly Jazz and female vocal jazz and in my opinion (with my components) I feel SPDIF sounds much better than USB. With my limited knowledge, I am convinced that an asynchronous USB DAC throws away all the reclocking done by the previous devices. I am using a Denafrips GAIA DDC and I believe their DDC implementation is fantastic. In fact I've had (still have some) several DDCs including
1. Antipodes P2
2. Empirical audio off Ramp 5 with Turbo clock and Dynamo LPS
3. Schiit Eitr
and have always been a fan of SPDIF input. However SPDIF is limited to 192 Khz and I want to utilize the DACs capabilities of processing 384 Khz and DSD 512. I am using HQPlayer and upsampling everything to DSD 256 (DSD 512 is too much processing for my Antipodes CX)
Hence the decision to install an I2S input and Lukasz said it's possible and my GA TRP took a trip to Poland.
Upon receipt, Andrzej, one of the technicians got back to me with some more info. I had to sacrifice the BNC input to make room for the RJ45 socket which has to be close to the USB Input. He also made me aware the Engine 53 inside the GA TRP is very much different than the Denafrips Gaia and the input-output relationship between the 2 devices are not compatible enough to play DSD files.
The following is a paraphrase from Andrzej (Super nice guy btw, I spoke to him over phone)
"The DAC chip in the GA TRP will not play DSD from the external I2S stream. Currently when playing from USB the chip gets I2S stream (4 signals) and additionally 5 other signals carrying the DSD and muting information, 9 signals in total being sent from USB to the DAC chip. When sending I2S (4 signals) to the same DAC chip from external (RJ cable connected to the streamer) we lack those 5 signals necessary to play DSD and eliminate the pops (muting signal). There could be a solution to meet your expectations - change the DAC board in Atlantic into R2R type, which needs only 3 signals from USB or streamer - 3 signal included in I2S stream, no Masterclock needed. That solution should cover PCM up to 384k and DSD up to 256x, both from streamer and USB as well, and should be tested before implementation in your DAC. As for sounding it's rather the question of taste. Functionally your current DAC covers DSD 512x. On the other hand R2R has higher signal level by ca 60% which makes signal/noise ratio better. Another advantage is O DC voltage which allows to eliminate interstage caps before the tubes. There is MCLK out from denafrips, but the DAC will not neet it. R2R recovers the MCLK from incoming BCLK, LRCK and BCLK signals. R2R does not limit tube rolling and does not eliminate the rectifier tubes"
I also gathered some more info:
1. Lampizator will use a Soekris DAC R2R module. Looks like it will convert DSD signals to PCM before decoding.
2. The I2S LVCMOS is extremely sensitive to noise. Hence the cable that connects the 2 devices should be super short (25 cm). Andrzej said he used a 0.5m cable and it was quite unstable and highly recommended I use a 25cm cable. So did Alvin from Denafrips. I reached out to Revelation audio labs to create a custom cable with the following config:
Source: Denafrips Gaia
View attachment 75209
Destination: Lampizator I2S input:
View attachment 75210
The cable is being made by revelation audio labs in consultation with Steve Nugent from Empirical audio.
Now I have to place the the DAC and the Denafrips GAIA super close to each other (with their backs facing each other) so I can connect them together with this super short 25cm cable.
Last but not least, Andrzej also suggested that my output caps are 2.2uF Mundorf MCap Supreme EVO SilverGold Oil. If I wanted something better he recommended replacing them with Pure Copper 1uF, which they use currently for almost all units. They simply sound better with better mids, only Duelund overtake them their view.So decided to do that upgrade as well.
Well, its an experiment.
It could be a complete genius way to pair these 2 devices and get the greatest sound possible or it could be a complete failure and a waste of ~ 2 grand. Lol. I am in knee deep, so no backing out now. I'll keep you posted once I receive the Lampi from Poland.