The Bose VCS-10 center speaker has good clear sound; voices are crisp and clear. But and this is important! you need a good receiver preferably one that allows you to adjust the settings on your various speakers. Stay away from Sony, Panasonic and receivers you pick up at Sears, Target ect. Try a Harmon Kardon, Onkyo, Denon. Also works best when connected to a Bose Acoustimass bass module.
I first tried the Bose Vcs-10 and dual cube Bose speakers on a Sony STR-DG520 5.1 Receiver with 100watts per channel. I bought at Sears. It was bad I thought it was the speakers they sounded flat no rattle whatsoever. But I decided to give them another shot, I had already invested a lot of money on Bose speakers. So I bought a Denon Receiver with 75watts per channel. The difference was like night and day. Even without having calibrated the Audyssey Multi EQ which uses a microphone to determine the distance and size of the speakers. The sound was a lot more powerful clear and crisp.
The Bose Vcs-10 is a good sounding center channel it does lack bass that other speakers have like Polk audio. But it does enhance voices which I believe a center channel should handle best. You want bass that's what subwoofers are for.
All said and done I am happy with the Vcs-10.