I used Cambridge Soundwords dipoles in my old Pro-Logic system, but bought direct radiating speakers when I upgraded to 5.1. My receiver is a 6.1 receiver, so I thought about using the direct radiating speakers as the rear channel (in series) and then using the dipoles as surrounds again. I wasn't going to do this originally. As you may remember, in pro-logic, the rear channel uses a limited frequency range. I thought the Cambridge speakers weren't full range (and was about to Ebay them), but I called the company and found out the are rated 90 Hz to 20 kHz. So that reason for not using them is gone. Is there any other reason not to use them now?