Just tried a two-sub approach in different positions....not even worth charting. At 55Hz, I hit 105db...at 110 Hz, it was at 64db.... a 40db swing.

This room sucks.

^^^

Why I don't want to chart my room: an essay.

Wow... major suckage. Hey, it's a challenge

Having said that, it does look like your biggest "downward" spikes are coming around the crossover frequency, and the biggest "upward" spike is coming around 55 Hz, or ~10 feet. I'll go back through the posts before I actually say anything with confidence, but I think this can be improved enough with placement changes that you can BFD out most of the rest of the bumps.

Mark,

Hmm, I wonder whether something in your cross-over might be responsible for your *ahem* sucky frequency response. For instance, maybe you have the sub internal cross-over and the receiver cross-over both on, and set to 100 Hz, and so they reinforce unnecessarily just below 100 Hz. Frequency roll-off might not be matched. That sort of thing.

Maybe you should post some more details of your system configuration so that those more expert than I, your humble servant, might have a crack at your problem.

On the plus side, if you expand your "suck out", you might be able to replicate the famed "Bose sound" with its missing frequency response from 200 to 280 Hz between Acoustimass and satellites.

--Martin

Hi folks,

I previously discussed my experiences with the Rane PE-15 to reduce room resonances for my sub. I had some intermittent hum at first that went away with some fiddling. Well, I was on vacation for a week, actually unplugged everything from the wall, came back, powered up and SH*T there's that loud 60Hz hum coming from my sub! I fiddled with the connectors again, i.e. turning them and pulling out and putting back in repeatedly, and no improvement.

But, before I went and tore apart anything or built better cables, I sprayed some contact cleaner into the 1/4" connectors in the PE-15 and the noise is gone and the contact appears solid.

So in my case, it wasn't a ground loop hum but the RCA cable connected to the sub amp having one side floating (i.e. acting as an antenna instead of the opposite polarity of the other side).

Lesson 1: Contact cleaner is your friend.
Lesson 2: 1/4" connectors stink because you can't see the contact surfaces.

--Martin