I have an outdated home theater system consisting of a JVC Dolby Pro Logic Receiver, Design Acoustics PS 1010 Front Speakers, PS55 Center Channel and Surround Speakers. I am looking to upgrade with limited funds, and to my ears, my center channel seems flat, decent bass, not bright enough...Would upgrading the center channel solve anything, or is upgrading the receiver to a Dolby Digital DTS the wiser 1st step? Also, is listening to a center channel speaker w/o your equipment a sufficient way to test it? Thanks for your help!