Bass Louder Off-Axis

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Perceptes

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The bass response from my monitors (Tapco S8's) is MUCH louder when I move away from the center of the room where the mixing position is. This means that when I have the volume cranked until the bass sounds decent while I'm sitting in my chair, my neighbors are being blasted with huge vibrations and I'm not even aware. Why does this happen?
 
What you are hearing is what is called standing waves. The causes include room dimensions and parallel walls. You might notice at that same position some frequencies are much louder than others or you may notice some missing all together. The latter is due to comb filtering. Again due to room dimensions and parallel walls. Do a search in this forum for websites of John Sayers and Ethan Winer. Post your room dimensions (including ceiling height) here so we can help you more.

DD
 
Perc,

> Why does this happen? <

For the complete story see the Acoustics FAQ, second in the list on my Articles page:

www.ethanwiner.com/articles.html

It's a lot to read, but when you're done you'll have the complete answer.

--Ethan
 
The point is, I have read all Ethan's articles and have already added fiberglass panels around the room, and I'm still noticing this effect quite obviously. :(
 
Perc,

> I have read all Ethan's articles and have already added fiberglass panels around the room <

Sorry, okay, then tell us how many panels you built, how thick they are, what type of fiberglass you used, and where you put them. And please remind us again how large your room is. It's impossible to make any room perfect, and small rooms need more effort to fix than larger rooms. But with enough treatment - assuming a reasonably sized room - you should be able to make the room accurate enough to mix with confidence.

--Ethan
 
I posted a rough diagram of my room with dimensions on the other thread:

https://homerecording.com/bbs/showthread.php?t=121864

I used 2" OC 703 panels (2 x 4 feet). The southeast corner has two panels at a right angle to accommodate the door (this is shown in the Realtraps demo video). The other three corners have panels straddling the corner. There are four panels spaced evenly across the north wall and two on the south wall. Each of these is spaced 2" off the wall.
 
Perc,

> I used 2" OC 703 panels <

Yes, I remember now. In that other thread I suggested you use panels that are at least three inches thick, or four for best results. The added thickness really does make a difference. Also, it sounds like you treated just the four wall-wall corners, yes? You also need another 4 to 8 panels across the wall-ceiling corners, and those too should be at least three inches thick.

So I think you'll get a big improvement if you double up the thickness on the panels you have, and then add some more at the tops of the walls.

--Ethan
 
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