Potential new room, will this work well?

Chadnliz,

You will get bass response issues in a room no matter what you do, the key is to lower the amount and size. If you get large overlapping room mode reinforcements as well as nulls, the 5a sub may not be able to accomodate the full extent of the reinforcments or nulls. By limiting the amount of variances in the response before hand, you enhance your ability to deal with and flatten out the frequency response even better as a whole. I believe the 5a is 11 band? That gives you 11 nulls or reinforcements you can deal with. The flatter you get the room before hand, the flatter you can make it afterwards. This will also give you more leeway in terms of room placement as well.

The other issue to consider, what if you decide to switch to another speaker eventually, one that doesn't have built in sub EQ? You severly limit your options unless you want to spend even more money later on and add an independent EQ device.

If you are already doing the work, you might as well build for good dimensions, since you are already paying to have the work done. If you can afford to and don't mind, taking 1' off that wall, even if you don't plan on building that other room, basically makes your room response good to begin with and for all any future speaker options.

Thanks again, it is an existing space but I will see if my parents are going to bid on it...........thanks a bunch.

NP,

That room mode calculator will show you a graph of the "general" locations of where reinforcements will occur in the frequency response and how large they will be (relatively). You can always use that to see about any other room sizes you are considering in the future.

Also,

If you have no other choice, you can always do what I did... Have an acoustical engineering group like Rives Audio consult with you and design the room to at least limit the room response as much as possible. I would recommend that no matter what you end up doing. That way you can have your room designed with optimal sound treatment.

Jkalman

I've read his posts before...he is not a total newbee. His question was fairly general...so was my answer. I left the exact placement of the "new" rear wall for him. The other walls, and the ceiling are already fixed in place...yes?

If he does some of your reading, I'm sure he can come up with something, other than the wrong place to build the wall? (40' is a lot to work with)

BTW, I did build my audio room, with a little help from my son...and a few friends that were unlucky enough to stop by at the wrong time....great acoustics, if I do say so myself.

I've looked at your room (very nice!)....I can see why you have a few problems though, and they are not the rear wall....of course you knew that.

Dave