Summary: They sound great. I am not a stereo guru and dont know a lot about how they work or why. I know that I replaced my BOSE acoutimas system front three speakers with POLK and couldnt be happier. The put out a lot more (and Clearer) sound than the double cubes I have from Bose. I will also add that the center speaker is the most important and is where I noticed the biggest difference. The center speaker I used was the POLK CS10.
Summary: These speakers are much better than the bar speakers now being touted to replace tower systems.Don't waste your money on bar systems, go right to a tower set up. I have these in a large room with a high ceiling so maybe that is why they are so much better.I wasn't aware of the bi-amping or bi-wiring capabilities of these speakers.I can notice a slight difference, more so when listening to music rather than TV.
Summary: I have a system set up for 7.2 surround and an Onkyo receiver that is capable of 9.2 surround(TX-NR818) with several Polk satellite speakers and wanted to up my theater to 9.2 surround. Talked with an Crutchfield advisor (Tommy) and he suggested a couple of these tower speakers as my right and left mains. Wow what a difference, the two mains give my set up a fuller(depth) sound from the front. Thanks Crutchfield and Tommy.
Summary: These speakers were relatively inexpensive and sound great! Not quite enough bass but pair well with a Polk subwoofer that I already had. Probably would not use these alone without the additional bass butt overall they sound crisp and pack a nice punch with my Sony receiver. Love how they sound for movies and TV as well as music.
Summary: The TSi400's are great for the price and in this case - you DO get what you paid for. Sound is good, bass is lacking (so DO get a Sub). I use these as surrounds and they perform just fine but they do NOT sound near as good as my Klipsch F-30's. The Combo is what gives me GREAT sound.
Pros: Can NOT beat them at that price.
Cons: Sound OK but not the Best. Use them as surrounds and mix them with an "audiophile quality" Main and add a Sub. Then you will be very Happy!
Summary: I have paired these with a Denon 4520CI receiver, Polk FXiA6 surrounds, Polk PSW-111 sub, and an old Infinity Video-1 (early generation center speaker) and they sound great. They provide a full, rich sound and do not overwhelm the center or surround channels, though that is heavily influenced by the receiver's level settings, I am sure. They have a nice range and reproduce music, vocals/voice, and sound effects well.