Bass Suckout in a Square Room - Remedies and Solut

Aggielaw, I have had just the opposite happen, with better performance with such a layout. I do sit quite close to the opposite wall which has quite a bit of absorbent room treatment.

The sofa is not the cause. If it is sitting in a null, moving it will not help but I have yet to find a sofa which is such a good bass absorber as to create a null.

Getting the listening position off the back wall and repositioning the speakers is important as is the use of true bass traps (at the intersections of room boundaries) to reduce both nodes and nulls.

Kal

Wrayman, You are absolutely right. A diagonal set up is a good idea and can produce excellent bass and over all sound include good depth.
The sofa itself is not the problem. The problem is where the sofa is located in relation to the speakers.

Meth, you suffer from standing wave, meaning you have low pressure and high pressure points at a frequency determined by your room size. Moving around till you find a sweet spot is really putting a band aid on cancer. If you listen carefully you’ll probably hear you have single frequency bass – no matter what your playing, the full bass sound will always be around the same frequency.

You need to add low freq some sound absorption to your room. A (fairly) cheap route is to buy a few sacks of R19 from home depot and stick them into a corner. You bass will tighten up and become more natural.

Regards
Paul

Experiment with speaker placement. The distance to the front wall and the side wall should not be equal. Experiment moving the sofa forward or back. GIK makes affordable acoustic panels and traps which are also decent looking. ASC tube traps are expensive but effective.