IMO you should consider Krell S-300i instead of 400xi, esp with Thiels. S-300i has more resolution, more texture, and is significantly warmer sounding.
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On paper, 400xi may look more attractive, I agree. But if you put them side by side - S-300i is much bigger, much heavier, the power transformer itself is bigger in size. I wouldn't be surprised if the S-300i turned out to be the one with greater current capabilities. Not to mention it is much more advanced in terms of features.
Completely from memory, I believe the toroid in the 400xi is very slightly larger than the S300i (800va vs 750va or something like that.)
I have double checked, and found out that transformer sizes/ratings are as follows:
KAV-300i - 450VA/13cm
KAV-300iL/400xi - 750VA/17cm
S-300i - 750VA/18cm
(for those not familiar with metric system, 2,5cm = 1 inch)
The S-300i looks to be much bigger in size than the one used in 400xi 'cos it is potted. If we adjust the size for the extra size of the pot (1cm extra), the transformers may well be identical.
I might suggest that if you listen at low levels you might well consider a pair of new speakers rather than change anyting else out of your system. A 6db gain in speaker sensitivity should be transformational. Do not get me wrong, I am not attacking the Thiel speakers. It is just that in my opinion you have to drive them pretty hard to get near their full musical potential.
You should really put the whole product number because they use KAV300 (something) on several things (even know this is the AMP section)
Anyway, I have the KAV300CD player and I would not trade it for two reasons. 1. It is the best sounding player I have heard, AND i have owned and used many many high end players 2. Since it is basically a TEAC, it is 100% repairable, as mine has been, by any local repair guy worth his salt. Unlike some other models that are Philps, which from what I undersand, are not always repairable and when they die you are SOL.
FWIW, I just auditioned some integrated units and it came down to a bakeoff of the 400xi and S-300i. I went with the S-300i. Both were great amps but as already mentioned the 300 sounded warmer in all ranges and, with my system, was more flexible with various source recordings. The 400xi was not as kind to recordings that were less than excellent, at least with my system (IMF TLS80 speakers, Rotel 991 CD).