I am listening to my RAAL SR1a headphones with my KRELL K-300i in my bedroom as I type this. It is the very best sound I have gotten from these headphones. I have tried a ton of gear on these headphones because I think they are incredible and sound like 2 channel, not regular headphones, which I am not a huge fan off.
In my office I have a CODA 07x preamp which has 2 sets of XLR outputs. I set of outputs goes to my CODA #8 amp which drives my Thiel CS3.7 speakers. The second set of CODA 07x XLR outputs was previously connected to the Parasound A21+. Which then drove my RAAL SR1a headphones via an amp interface box. I thought I would be happy with the A21+ for this task but whenever, I listened with the KRELL K-300i integrated and the RAAL SR1a the A21+ was found lacking.
So, I made the crazy decision to trade-in the A21+ for the KRELL Duo 125XD. This amp will be used just with the RAAL SR1a. I know crazy but this is end game stuff for me. I was considering getting the 175XD or a used 300XD to have the option of also driving the Thiel CS3.7’s but I decided my CODA 07x and CCOA #8 were amazing and not to mess with a good thing. The 125XD will be under-powered for the Thiel.
I also have the Benchmark LA4 preamp in my office. It is also connected to my audio sources as is the CODA 07x. I just flip the XLR output from each preamp to the CODA #8 amp to change things up with the Thiel CS3.7. I will try the LA4 with the KRELL and RAAL along with the LA4 and 125XD with the Thiel CS3.7 though I expect this to be lacking in power,