I recently got a new disc player (Denon DVD 2910) and was putting it and the RTA11TLs through their paces and was disappointed with something that I heard. The disc was Jars of Clay, If I left the Zoo, River Constantine. The track has some great deep solid drum rhythms, I am guessing it is a large jimbay drum. With the volume set at about 1/3, the bass was a train wreck with every beat of the drum. It may have only been one channel as the drums are emphasized in the left more than the right. Watching the cones, their motion looked under damped and producing modal distortions. These speakers never sounded this bad.
What is going on? I had previously removed the drivers to add some dynamat like material, repositioned the daycron and to replace the tweeters but just used the old gaskets. Could it be an air leak?