Got back from my trip to Texas and started playing the modded Voyager on my RAAL SR1a headphones. The Voyager was playing constantly while I was gone, my estimate is 72 hours of post mod burn-in.
In the past, my comments on the Voyager with the RAAL was that it was not a great combo, just OK. Something seemed off compared to the CODA #8, KRELL K-300i, and the Benchmark AHB2 (this required a SR1a specific Convolution filter running on ROON Core).
Today, I am running the Voyager without any Convolution filter to my CODA 07x preamp and RAAL SR1a. The sound is like the AHB2 but I do not need the Convolution filter to tame the highs. Just brilliant sound. Amongst the best sounding RAAL amps now, along with the CODA #8, KRELL K-300i, and AHB2 (with filter). There is less bass than with the KRELL but similar levels as the AHB2 and CODA #8.
I have not played the modded Voyager on my floor standers since I got back from my trip but based on my comments last Thursday I expect greatness (maybe more). I cannot test this now since the family is sleeping.
The fact that the Voyager sounds so goods with the RAAL and Thiel CS3.7 (on Thursday) is the best possible outcome. I can use either of the amps on either speaker and have great sound. This was not the case prior to the mod.
There were some posters earlier on this thread that were saying mods do not work and the comments by people like me are confirmation bias on the money spent. In my case, I have a few amps that I am comparing the mod with and I think I have a good baseline of where the pre-modded amp stood with respect to my other amps.
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On Monday, I am taking a drive to the dealer that sold me the CODA 07x preamp and I will figure out once and for all if my preamp has an issue with hiss.