The Av3 TL is a tranmission design and it used the smae tweeter as your surrounds. The transmission line will give you exellent bass response down to about 40 ish hz. There is also a matching AV3 center channel.
A few years back, Ron Joyner built his son a full HT system using all the AV line and a sealed 12" servo sub from GR.... aparently the results were far, far above expectations..
jay