My best guess would be a mismatch with the MIT or the positioning....have you referred to Immedia's web-site? I would also refer your questions to Immedia as they are the US distributor and very helpful.
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Strangely enough I own the TC-60 and until recently owned virgo's. What you are describing is consistent with my experiences. The virgo's do not have as much body as the tc-60, especially if you have the tc-60's near a wall. One of the virgo's few flaws/characteristics is a somewhat lightweight presentation. It may just be the wrong speaker for you. You might give the proac or vandersteen line a listen. The vandersteens especially have a similar presentation.
To get more body out of the speaker, try a) putting the floor spikes on , b) put them about 6-8 inches from a wall and listen to them in more of a farfield setting (you will lose some of the magical imaging trick), and C) put a big solid state amp or powerhouse tube amp on them. I have never added a subwoofer, but that might help. Putting a big amp on them really does bring out their bass - it changes them quite a bit.
Even with these changes, you will never make the virgo a big voiced speaker. It is designed for low level detail, precision and speed at the sacrifice of instrument weight.
I had a similar experience with another AP speaker and it was mostly the placement of the speakers. The rest of my problem was room and furniture interaction. I corrected mine, to a great extend, by placing the speakers about 3.5 ft from the wall and 7 ft appart. You can also review the schematic at Immedia on speaker placement. My associated equipment are SS.
Your problem does not come as good news to me; because I am anticipating buying the Virgos or higher. Nevertheless,let me say I have heard them a few times, and set up is critical. I heard them with my own big band CD and driven by an expensive tube amp, and they sounded very good.I was not clear as to what amp you have, but I agree with the other audiogoner, put a big amp behind them; also, there impedance is a bit tricky. Also, I also would recommend a new cable like the Analysis Plus Oval 9 cooper.(You can probably buy it from Audio Advisor and return it if you don't like it; check their return policy. This cable if you can believe the reviews should open up the mid-range. I think the MIT is not a good choice for this speaker. I have been using MIT term 2 with B&W for the last four years and am convinced this cable compresses the dynamic range. It was an improvement over the Monster Reference hose I used---more coherent but MIT lacks dynamic range. Good Luck