I just heard some horns at Radio Shack and was quite impressed. Clarity and detail without any brightness. They were only like $80 each. PA speakers I think with a large woofer. My Polk CSI3 center on the other hand was bright and harsh when I played a music DVD. I had to enlarge the hole and change the tweeter in it to a vintage tweeter I had laying around which got rid of the brightness.
Polk SL2000WC $3 DIY mod. Smaller the uf, the less harsh your SL2000 is.
1. SRS: .47 uf/250v mylar cap top SL2000, 1.0 2nd, 1.0 3rd, .47 bottom
2. 2.3: 1.0 middle
3. 1C: 1.0 top
4. 2B: 1.0