How do you improve bass response in a null?

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.

I had a problem not so much with a null, but rather a peak at 40 Hz. Though I had a bit of a null at 80 Hz, the response of the sub in the room was almost +10db higher at 40 Hz. Moving the sub around did help a little, but didn't come close to eliminating it.

After months of heavy lifting the sub to various points in the room and annoying my family and dog to no end with test tones and sweeps, I decided to try and play with the phase of the sub to see if it made any difference. The usual way to set the phase is to adjust it (usually a switch or knob on the sub) so that you get the loudest response at the listening position, which is what I always did. So just for grins, I decided to flip the phase switch on my sub from the 0 degree position to the 180 degree position. I could instantly hear the 40 Hz peak was either gone or significantly reduced. So I re-ran my test tones and calibrated things again with the phase set to 180.

Sure enough, after measuring it with my Radio Shack meter, the 40 Hz peak was reduced to a 1 db peak. No more boom-boom headaches or seemingly one-note bass. Music and HT sound signficantly better.

Not sure if it will work with your null problem but you may want to try it. My system includes Dunlavy Aletha's and a Velodyne FSR-15 sub. Try it and let us know if it works for you.

Dave 1,

Very creative solution. Unfortunately my sub's phase is already set for maximum spl. If I reverse phase, it will make the null even worse. If my sub were set out of phase, then your solution would be a good one.

Thanks for your advice though.

Ken

run a pair of subs in stereo. easier to get a more natural low-frequency soundstage, & easier to set up to avoid room nodes, imo. added benefit is much cleaner sound, due to much less distortion for the same spl. especially important if you're not using subs w/such low-distortion/hi-output ratings as vmps... ;~)

doug s.

Doug,

I've just ordered a REL Storm III. In addition to it I'll have a Velodyne HGS-18 & M&K MX125 with dual 12" drivers. What would be your suggestion for using either of these 2 subs as the 2nd stereo sub in addition to the REL?

The Velo can be connected via high or low inputs, while the M&K is limited to low level only. Or should I just connect all 3 and run them in concert?

Thanks,

Ken