How do you improve bass response in a null?

I imagine experimenting with sub placement would help. Also, you could move the mains either forwards or backwards a foot or two without changing the fact that you and the tv are centered between them. That might work. Less likely to work, but still a possibility, is to move the speakers slightly farther apart. I'm guessing you've found the right spot for the mains though, so I'd try the sub first.

How about moving the couch a tad further back. You don't have to muck with speaker placement much and this would change your listening point of perception. Sean
>

You didn't state where the sub is currently located. The optimal position for best bass loading is normally in a corner of the room, where there are three adjoining surfaces. Sometimes moving the subwoofer only a few inches will make a significant improvement.

Dbwl,

I read a past post of yours where you heartily endorse REL subs. You've given me food for thought. I'm thinking that the REL might augment the bass better than my current M&K sub. Do you think it's more a matter of location or brand of sub? The M&K has plenty of raw output, but may not integrate as well. Does integration have any bearing on spl level?

Sean,

As you suggest, I've thought about moving the sofa farther back, but then realize that the TV picture would become smaller. However, this might be an acceptable trade-off. It's easy enough to try. I'll let you know the results.

Sdcampbell,

The sub is currently located on right front wall about 3-4 feet from the side wall. Corner location would interfere with a closet door on side wall. I've heard that while corner placement provides more bass reinforcement, it also can add to boominess and standing waves. But as you suggest, maybe I just need to move it a few inches.

In the past I've moved my seating position a few inches, and it never has made a significant difference. Is this the same as moving the sub's location?

Thanks to all for your input.

Both brand and location make a difference for quality and spl. I don't think integration per se has anything to do with SPL (if we're talking about the same definition of integration), but there might be something I'm not thinking of. A Rel sub might not produce a null zone from the same location because they're down-firing (if the M&K is a front-firing sub). Getting a similar sub with more power may not do the trick, if the null zone is caused by by the room structure. The Rels, btw, don't come with the most powerful amps out there. I'd definitely experiment with moving the sub around a little. That's the easiest and cheapest solution.