system has weak bass. any suggestions as to why?

System consists of oppo bdp-83se nuforce dvd player.synergistic research tricon analog interconnects connected directly into an adcom gfa555 power amp. speaker cables are monster 1.5s.speakers are mirage m7sis.amp. very recently repaired (had since new) input jacks replaced. some improvement, but bass is still pretty much still missing in action.replaced woofer in one speaker. made no difference.speakers are setting flat on carpeted concrete floor.both power amp. and oppo player are plugged into a power wedge 116. I suspect weak caps in power amp. but I am not sure. speakers and power amp. both set boxed up for 10+ years.amp. was then "brought up slowly" with a variac when it was initially powered up after its long sleep. I am cosidering a 2nd gfa555 to bi-amp speakers. this after talking to one high end (expensive) power amp. companies tech. who suggested that one gfa555 may not be enough amp. for the m7sis. any ideas as what to do next would be helpful .thanks