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
budgetconcious
I would recommend two things: Set up the speakers and your listening position EXACTLY (within an inch!) of what you get when following this guidance:

http://www.cardas.com/content.php?area=insights&content_id=26&pagestring=Room+Setup

The other is to experiment with super cheap bass trapping. Go to HD / Lowes / etc and buy four rolls of insulation. Stack them two high and put them in the rear corners. This should improve the bass response noticeably.
how big is the room they are in? have you walked around the room to see if bass increases in other areas?

Cathode: I used a tape measure to get the speakers as close as possible to "Exactly" 5ft. Apart. I also measured as closly as possible 5ft. back from my listening position to form a 5X5X5 triangle. Both speakers are toed in 2". I am temporarily using this nearfield listening postion because I "fairly recently" moved. The rear of the basement contains boxes etc.. I am aware that these items can affect the soundfield of the speakers. But,I had hoped to minimze/eliminate the interference of "this stuff" by use of the nearfield listening position. www.cardas: I will try the use of insulation to see if the condition (bass) improves. You did not state a specific thickness. Is R-19 fiberglass sufficient? Also the speakers are positioned along the long wall of the basement. per your websites diagram F. Diagram B also applies. ( And yes my head did explode, Thank you very much!) Seriously though.The diagrams are very helpful. I appreciate your websites diagrams etc.. Thank you. Also, before I moved. This system was in a perfectly rectangular room. Approximately 10 X 14. 10ft. side wall to side wall. 14ft. the long way. The system lacked bass even in that standing wave prone room. Rayray8:I have the exact measurements for this room "somewhere". I will have to take them again.(sigh). Again the rear wall of the basement is assymetrical. A bar is located along part of it. An enclosed furnace and water heater is located right next to the bar in what would be the approximate center of the rear wall. The whole area surrounding the nearfield listening area is one open common space. (Aside from the previously mentioned stuff). There are no walls or dividers. Next to that area is an area that is currently serving as my bedroom. The irregularities of the "rear wall" makes the area almost impossible to measure. However, those same irregular surfaces also serve to break up standing waves. So its not all bad. However to answer your quwstion directly. The bass seems to drop off pretty much in direct proportion to the distance that I move away from the speakers. Also In general. Consistently he right speakers woofer appears not to be working as hard as the left speakers woofer. So in addition to the recommendations That I have received here. I am going to try reversng the leads to the right speakers woofer only. I will then see if this will help to correct the problem. Currently the speakers tweeters & mid ranges (rear mounted M.S.E.drivers) sound like they are in phase. (The m7sis are assymetrical front to back. Tweeters and woofers in front. M.S.E.drivers on backs of the units).I will try the various recommendations as time allows and I will let you know the results. Thank you.