I would say this combo is superb...! Theorem is such a wonderful dac/amp. For me..it's a step up experience of sound quality in portable world.
IPC + Theorem + Fitear Parterre
If i compared this to my clasdb, the line out from Theorem has more gain to it (not much - but i am happy for it). The clarity and detailing i would say not much different, however, through Theorem, i felt like the sound somewhat slightly "bigger" - more spacious and fuller sounded. (just a slight - but i really like it). The Theorem is warmer compared to clasdb (using the same external amp). What impressed me most, is the amp section of Theorem. I never thought the amp section could be this good. the sound is a bit warm but very neutral, very good detail and clarity, the bass is tight and well pronounced. I felt like it has that punch reaction to it, but it does stays very accurate and snappy. The mids is not too laid back also not too front (some would say too front) and very well bodied. The highs is VERY smooth without feeling any recessed. The sound stage is very good, not too wide (but enough to feel that spaciousness), very good depth and every sound has weight to it. The clarity, detailing and the sound image is EXCELLENT ! ----> (between ipc+clasdb+MK3 VS Theorem - my pick would be Theorem for sure ! - the gain is not as powerful as MK3, but i can drive my HD800/650 at high gain, using 50-60% of volume, with no problem at all)
My only small complaint is the noise floor - with sensitive phones and it's loud enough (to me). Compared to MK3's hissing level, Theorem is lesser and softer but still noticeable. using the TG334 and UM3xRC the hiss is loud enough to me - the hissing still noticeable at a very low volume during music. Using ATH3000ANV i also notice a slight hiss at Medium gain with no music. Please note, personally, i am too sensitive to noise floor and i hate it if there is, but in this Theorem case, i would make an exception, because even though it has, but not too bad.
ipc + theorem dac + Intruder + tg334
Forgot to mention - this Theorem is "heavy and big"..i won't suggest to have 3 stacks combo like my picture above to carry around unless u just put them on desk while listening...also the Theorem it self is "thick" - by looking at the picture above might not that bad (the 3 stacks one below), but in reality when u see it and feel it - trust me, they are damn burger-ing and weight like a ton. Anyways, i don't think we necessarily need another external amp once we use the Theorem - it will serve your music quite well enough just with it.
Edited by muzic4life - 10/11/13 at 12:37am