i think i have one of those in storage somewhere
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Trying to jog my memory, but my recollection of the Acurus was that it had a rather low input impedance which might be a concern with some tube pres. The sound of the Acurus amps as I recall, had bass that competed with much more expensive offerings, but alas the upper range was quite chalky. That chalkiness might(?) be alleviated with a tube pre such as your Musical Design SP 2B (which I have no experience with), but otherwise IME would not mate well with the Thiels. A 12 X 12 room can be quite challenging as well. Good luck.