Altec Lansing Model 100. Liquid cooled tweeeter, the midrange has a rolled edge, and dual 8 inch woofers and the second woofer is not passive. These speakers sound amazing and while your listening to the music, you will swear that they are right there, playing in the room. The highs are crisp and clear and the voice is has presence and is very full. The bass is tremendous and doesnt over power the rest of the music yet can still fell the bass through out your body.