C J 11a VS 12s does the 12s sound better

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.

I owned a pair of 12's and have heard the 11A. In my opinion the 12's sound much better. The added power seems to work magic. It may be the fact that I like my music a bit bass heavy but the 12's do satisfy. CJ 12's on female vocals are hard to beat. If you have the funds I do recommend the upgrade.

I started out with one 11a, and when I had the itch to upgrade, I compared the 12's to a pair of 11a's bridged to mono. This bi-amp set-up was hands-down the winner. You don't get quite as much power as you do out of the 12's, but the bass depth and control improved quite a bit, and the midrange and treble were much more liquid and detailed. I've been completely delighted. I was back at my dealer the other day and auditioned the Revel Studios with the 12's (since he only has one 11a), and when I complained that the midrange sounded a bit congested, he told me I was spoiled by bi-amping. Definitely worth a try.

Pleas explain to me "bridged to mono". I thought the 12's were basically two 11's in mono. When you biamp do you mean for highs and lows?