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help with bass output in basement

post #1 of 4
Thread Starter 
I originally posted here.. has the pictures and such and layout of my basement:

http://www.avsforum.com/t/1443851/looking-for-some-major-help-with-subs-in-basement

I figured I'd try posting here. In my on going battle I've made some major improvements with response for the LEFT seating position.. I can get it to sound pretty good.. The right chair however is sitting right in a null/mode/void of bass... Also if you walk around the room there are still a lot of voids/nulls here and there... I was wondering if anyone would have any pointers?? I'm thinking maybe the wall that separates the basement from the "finished" section to the unfinished section just isn't cutting it? Right now it is just Dry wall with some of the pink insulation behind it on studs..



In the newer layout I tried to make some bass traps in the corners (highlighted in blue). They are about 48 inches tall right now (about half way up the corner). The red circle is the wall with Pink insulation and drywall (the back of this wall is exposed yet, yes I can see insulation on the unfinished side).

Other things I've tried
1) added a smaller sub along the right hand side wall.. it is opposite of the 18" sub.. It didn't seem to clear up any nulls in the right chair position.. It seems like if I added 6 more subs I'd still have this wonkiness in the room.. I can't describe it but it just doesn't sound good except in a few areas..
2) I added 2'x4' traps.. these seemed to really help with just the highs and mids along both walls..
3) Anytime I move or add or take away subs to test I generally redo audyssey..

Notes:
1) I've done some moves on the 2 15" LMS-R's in the front but doesn't seem to help.. plus the boxes are quite large and in the front is kind of the best place for placement.
2) probably going to add a couch soon down there as well.

Any ideas? Could my middle wall be the main problem?

thanks,
Mike
post #2 of 4
The biggest problem I see is the chairs being in the middle of the room. That means you're going to have nulls sourced by the rear wall reflection. The first thing I'd do is take one of the subs in the front of the room and move it to the back of the room. Having both in front they're both exciting the same front to rear modes. Alternately, rotate everything 90 degrees. Long narrow rooms are the worst, short wide rooms the best, in terms of sound.
post #3 of 4
Thread Starter 
Bill,

thanks for the reply.. I agree with what you are suggesting too.. I was >< that close to moving a sub to the back of the room. 2 things though. The room is really long (as you mentioned a bit narrow too) and the back corner that is inverse + air hockey table doesn't lend for good placement.. I'm worried someone would end up kicking the sub, even with a grill on it. Also the sub would be waaay back in the back .. I think the total length is probably close to 35 feet if not more.

Also when you say rotate everything you mean move the projector screen as well and put it on the long wall? I was thinking this too but the lower ceiling in the middle just tends to make the screen look like it would be too low.. I already asked my wife what she thought (she's my unbiased overall project manager, hah) and she agrees that while it would greatly improve sound the cost of screen placement might be too much... If you are suggesting I just move the subs I might consider this. I tried placing 1 along the left front wall facing in but it seemed to made the situation even worse. I'd hate to have to move the subs even closer to the center of the room as it would mean I would be practically sitting on them (since the room is narrow).

So I'm kind of at a loss.. What you suggested is correct.. I guess I was just looking for any other alternatives but I think I'm out of options and just disappointed... I would think someone would have ran into this with a bigger room and found a fix as they couldn't put the seating all the way in the back... How do others do it? A lot of home theaters I see have 2 rows of seating and usually the front row is pretty much in the middle...

thanks,
Mike
post #4 of 4
Quote:
Originally Posted by mikeciccarelli View Post

Also when you say rotate everything you mean move the projector screen as well and put it on the long wall?
Rotate everything. If the one long wall doesn't work put the screen on the short as yet uncompleted wall.
Quote:
A lot of home theaters I see have 2 rows of seating and usually the front row is pretty much in the middle.
Doesn't make it right.
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