Please forgive me for working around your initial question, but, as good as the Aleph is, I can't help but wonder if it's the right choice for your Thiels.
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Thanks for the help. I already assumed that an ALeph P would match with the Aleph 5 but the question now is would the Thiels and the all Pass electronics be a good match anyway. The other question is would an LS-5 or LS-22 (or Aleph P) give me the warmth and dimensional quality I don't feel I am getting from my SP-9.
I sold THIEL's for many years, Threshold Amps then, which were Nelson's first company, I believe.
I really liked using a tube preamp with solid state amps--to give a rounder sound, smoother upper midrange to the solid state of the Threshold.
The Pass is much more refined than the Threshold--but still, IMHO can benefit from a really good tube preamp--depending on one's taste, certainly.
Without checking for a mismatch of impedences, you may consider a cj pre, or a VAC pre with this combination.
Good luck and good listening.
I agree with Pubul and Unsounds about the match between the A5 (which I currently own) and the Thiels (which I have owned in the psat, but not together and a different model). If the A5 had more power and more current, I think it would be a good match with the Thiels more strident and detailed sound (which is what I like about Thiels - great speakers FWIW).
I am running the A5 wih Gemme speakers, which basically use the same drivers as the Thiels, but a tad more efficient. I also run an ARC preamp (LS16II with the "supertubes").
I would never say the A5 lacks body, just the opposite. And I am coming immediately from SET and before that high power high current Aesthetix/Krell FPB/Wilson W/P5.1. I went SET based on all the SET lovers comments on this site, that lasted about 6-8 months and I grew bored with the SET sound - to me I missed the excitement.
I am still not sure if I find that the A5 is a bit under powered for my speakers, as I am thinking I may want to push the music a little more forward. But a large majority of the time I find I really enjoy the performance of the A5.
So, its a tough call. Do you love the Thiel sound most? If so, replace the amp. Do you want the sound of the A5, replace the speakers. I think (for me) that a more detailed speaker (like the Thiels) go well with the A5. A soft speaker, with a "traditional tubish" sounding preamp plus the A5 would be too underwhelming for my tastes, lacking the excitement I am seeking.