I agree with wallyfl., Here's my two cents;
I have three REL R-528 and one REL T-9. The T-9 is used for center in a home theater set-up and one REL R-528 behind the sofa. In front for LF and RF I have Paradigm Signature S2 and just outside them are the REL R-528's. I have them connected both high level and LFE. For two channel listening, I'm always amazed at how well everything blends. I sometimes have to put my ear up to the center channel (Paradigm CC-690) to see (hear) if it's putting anything out. Again, only left and right channels are active. Then I go back to my listening position and enjoy! I believe a good quality bookshelf with a good sub sounds as good or better than any tower since towers do not have the low frequency extension you get from a sub. And the REL, by connecting it via high level, it's getting the same exact signature and the main speakers so timing is right on. The REL is undisputedly the most musical subwoofer available. You have complete control of it's volume level and crossover frequency, ultimate flexibility to fine tune to any room. They will surprise you!
I have three REL R-528 and one REL T-9. The T-9 is used for center in a home theater set-up and one REL R-528 behind the sofa. In front for LF and RF I have Paradigm Signature S2 and just outside them are the REL R-528's. I have them connected both high level and LFE. For two channel listening, I'm always amazed at how well everything blends. I sometimes have to put my ear up to the center channel (Paradigm CC-690) to see (hear) if it's putting anything out. Again, only left and right channels are active. Then I go back to my listening position and enjoy! I believe a good quality bookshelf with a good sub sounds as good or better than any tower since towers do not have the low frequency extension you get from a sub. And the REL, by connecting it via high level, it's getting the same exact signature and the main speakers so timing is right on. The REL is undisputedly the most musical subwoofer available. You have complete control of it's volume level and crossover frequency, ultimate flexibility to fine tune to any room. They will surprise you!