low frequencies

mlsstl , I really appreciate the valuable information. As with everyone else's shared experience and advice. I've not moved the cabinets closer to the walls yet. I'll try this out! 

As far as placement. The speakers are 30 in. from both the rear and side walls and 7ft 1/2 feet spaced apart from each other. (straight ahead currently , no toe-in) Room dimensions are 12ft 1/2 wide 18ft length 8ft ceiling . Thick carpet, curtains and couch. 

TY for the suggestions DILL, The distance is 10ft ear-tweeter distance. Funnily enough I have moved the couch back another 2 feet and bass is sounding much more full. Polarity is all good😎

James633 thanks for sharing those thoughts. You have a lot of experience which is always nice to hear about. I was able to get much better sounding bass from a seated listening position by putting the couch further away from the speakers. Now at 13 ft from the tweeters and 3 ft 6 in  wall behind me. I think it was a bass null where I was before.