Lots of bass at walls, lack of bass in center of room/listening position


I guess this is relatively common in listening system. Is there any way to smooth this out so I get more bass energy at my listening position? This happens with our without my 2x 18 inch subs. Room is 12 x 16 x 8 ft, speakers 4.5 ft apart on long axis and I am sitting 4.5 feet away. I tried moving back and forward but the entire middle center of the room except near the walls has decreased bass.
Is this a boundary effect or could it be due to bass cancellation effects?
smodtactical

Showing 1 response by audioquest4life

@smodtactical,

I have been down your path many times over the years. Experiment, experiment, and learn from others for sure. So many factors play into getting good bass response, and as others have mentioned, normally, it’s complicated to get even bass distribution throughout the room with room modes playing with your ideal settings and affecting the listening quality. I have learned to use the Velodyne SMS1 Sub EQ for my sub integration needs. Well, lately,  not much at all due to my new Classic Audio Loudspekers T1.5, which is in another post. 
Anyway, here are some views of my smoothing progress as measured at the center of the room, which is the new listening position with my giant speakers. You can see the initial response and after response. Playing with different frequencies, phase, etc., and given time, you will get a smoother plot.
https://www.amazon.com/photos/shared/rP9gxID-Ts6SZNr4AwftqA.NFFn8vgXexCg9g-SaViCMW

 But, and I say this, do you really want a smooth bass plot? It’s sort of a rhetorical question, but if you want excited bass at let’s say, 50hz, you may want to visualize what it will sound like for you, in your room, with your equipment. I think smooth bass is okay for critical listening if your speakers need it, but not all speakers need extra bass. But yes, if they do, then add subs to help augment that portion of the musical spectrum that your speakers can’t reproduce. 
I find myself using subs less now that I have speakers with 18” downward firing bass, and 15” front firing bass. 
The room is a major component of your audio system. If you can, spend money on room infrastructure things such as sound insulation (Roxul safe and sound) in the walls, Quietrock sheet rock, anything that will assist with noise abatement that will inhibit noise and bass from leaving The room will greatly benefit your listening pleasure and bring peace to your family who do not want to listen to Aerosmith at 100db with a 50hz bass bump to feel the kick of the drum. I spot treated with absorbers, diffusion as needed after I listened and measured the room to suit my needs. Good luck on your journey.