Just noticed a problem with the center channel output. I'm getting NO bass from the center speaker. Ive tried setting all speakers to large with no sub but it didn't make a difference. This happens in all modes even 5/7 channel stereo. Tried new speaker cable and banana plugs. If I hook up the center speaker to the right or left channel it sounds great so I know the speaker is OK. But when hooked up to the center it lacks almost all bass. It sounds like it always has a low freq crossover active at 2-300 Hz. Processor reset didn't make a difference. My unit is out of warranty now so Im not sure it is worth it to take in for service. Any suggestions?