I have a SONY DE-197 stereo receiver with an ANCIENT pair of Paradigm speakers. Lately I am not happy with the sound quality of this setup. I suspect it is the speakers, but lately I have wondered if these are a good match for the amp as they are probably not the latest digital tech out there. I ask if the speakers are worth the effort and expense to have rebuilt or calibrated? Had this done years ago. Would it be a better alternative to go with a new speaker system, and what would be considered a good match for the SONY?