Spica's TC 50 vs. Sound Dynamic RT 3's

I've had two pairs of TC-50's. The first was the original and the second has slightly better connectors, a cross brace, different felt configuration around soft dome tweeter and supposidly better power handling. The later model TC-50 was better. The TC-60 was completely different and I have never heard it. I modified my TC-50 with less internal "stuffing", internal wire replaced with cardas wire, new edison price connectors, removed the felt on the front. The sound of the TC-50 does have some coloration, kind of a signature midrange sound, excellent sense of space, imaging, phase coherency. Bass is very tuneful but unless you're in a small room bass can really lack (my current setup suffers from this). I find they sound best with cardas cables (they can sound too lean with the wrong cables). I don't have a tube amp but they did sound better on a tube amp I heard them on. They have a 4 ohm load so If you have a true class a amp like mine then their otherwise poor efficiency is alleviated somewhat. The spicas overall can really compete in terms of revealing detail, space, imaging even with real expensive pieces but have some harshness, coloration, damped bass compared to good proacs, charios, others.