Need to build a headphone system

Go for the RAAL SR1b, at least on a home trial.

You could try out the SR1b with a $300 Schitt Jotunheim R RAAL amp (if you can still find one). Use the Star8 cable with the JR.

If you want to spend a bit more, the best amp for the RAAL is the VM-1a. It is a $7K tube headphone amp and really is the perfect match for both the RAAL SR1b and CA-1a phones. The SR1b sounds more like 2-channel and the CA-1a is more like headphones. With the VM-1a amp the CA-1a is incredibly dynamic. I think even bass heads would like it.

Word is starting to get out on the 2-channel community.

Oh, dear, the CA-1a is again something else! The HD-650 was already a bit of a revelation, but the RAAL quite simply steps up the game to an entirely different level. The increase in resolution is unbelievable, as is the further increased transparency. It’s that I know I just put on a headphone, but honestly, this had nothing to do with headphone listening in any way that I had experienced before. Jeroen is a more seasoned headphone listener than I am but he was as amazed as I was

In many ways, the CA-1a reminds me of Magnepan ribbon speakers, only with no crossovers and no room issues. Interestingly, that comparison also extends to the bass where the CA-1a is extremely fast and sublimely accurate, but not particularly robust or full. In fact, the entire frequency range is abundantly free from coloration and thickness, and the bass was simply no exception.

SAEQ Hyperion Ge and RAAL Requisite CA-1a | HFA - The Independent Source for Audio Equipment Reviews | Page 3 (hifi-advice.com)

The CA-1a is not even the best RAAL phone and the one that 2-channel folks should hear, that would be the SR1b.

The best place for RAAL info is head-fi.com, where Danny and Alex the 2 principles of RAAL-Requiste help out.

Raal Ribbon Headphones - SRH1A | Headphone Reviews and Discussion - Head-Fi.org

RAAL-requisite CA-1a Circum-Aural Ribbon Headphone is here! @HeadAmp | Headphone Reviews and Discussion - Head-Fi.org

I am going to sell the BEST headphone amp for the RAAL SR1a and CA-1a, the VM-1a amp. I am going to use a CODA #16 2-channel amp with these phones instead. It is not as good as the RAAL VM-1a but close enough and I want to raise funds for a second 2-channel amp for my new speakers.