Hi , I know this is an old thread but thought I would join in , I live in Fort Worth and am a NHT 3.3 owner, I bought mine in the early 90's. My speakers are in a large room, maybe 16 by 26 with 10 ft ceilings and my pair will play without noticeable distortion or compression to Rock concert levels, and that includes the Bass frequencies as well. I've never found their limits , they can play loud enough to make me have to leave the room .... and that's loud. I think I remember Ken Kantor the designer saying that they were designed to be able to play at 115 or 120 db. I'm also in agreement that it's important they have lots of clean power to make them really get up and boogie. I don't do it often but once in a while, Boston goes into the cd player and they Rock! The 3.3's have the best Bass I have heard in a speaker system without a subwoofer, I love my pair, they sound great playing any type of music. You would be welcome to come by for a listen to compare them to yours.
Best regards,
Dean
Best regards,
Dean