I had an 11a replaced it with an mf2500. Significantly more bass response especially noticeable during Tachovsky's 1812 overture with the digital cannons. However, I feel I lost some detail in the mid and high end, again noticeable during "Vivaldi the four seasons of" with anne sophie mutter on violin. I would hope that the 12's or 8a's (soon to be replaced) would bring back the detail(mid and high end) along with the bass control of the 2500. I an using a cj premiere 17ls as preamplification and thiel cs3.6s.
