Is placement that important when using two subs in room to cancel out standing waves? - diyAudio
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Old 13th May 2004, 04:08 PM   #1
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Default Is placement that important when using two subs in room to cancel out standing waves?

In other words, If I am going to use two identical subs in my living room in seperate locations to help get rid of standing waves and therefore "sweet spots", is it enough just to place them in different inconspicuous(sp) locations, or is it necessary to, for example, place them at exact apposite sides of the room, a few feet from the corner?
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Old 13th May 2004, 04:15 PM   #2
synergy is offline synergy  United Kingdom
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standing waves are a result of room dimensions surely?

in that case aren't you going to achieve a worse result separating your subs because of comb filtering?

my thoughts would be that you should really keep your bass sources together and move them to an off center location with regards your opposite walls in either direction (can't do much about the floor/ceiling unless you want to hang them)

dunno that's just my take on it

dave
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Old 13th May 2004, 04:17 PM   #3
tiroth is offline tiroth  United States
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(1) Placement matters...

(2) Not as much as with mono subs...

(3) And there is no easy rule of thumb to say what the "best"

I think if you start with a reasonable location, do some trial and error, figure out where standing waves exist and use that info to assist you in placement, you'll find a good setup.

http://sound.westhost.com/subcon.htm
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Old 13th May 2004, 04:35 PM   #4
sunil is offline sunil  India
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Hey Paulinator,

At what frequency are you crossing the sub ? I'm planning to do a Shiva sub but can't decide whether to do a single or double. My main system is active & I have to do a 4th stage for the sub.

I was thinking of 80hz as the main system has decent output at this stage. If it does'nt sound right, do you think I can Linkwitz transform the main system to push the output at 80hz, then crossover to the sub or should I crossover higher at maybe 100hz.

Question is, if I crossover at 100hz will the position of the sub be apparent.

cheers,
sunil
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Old 13th May 2004, 05:14 PM   #5
Mark Kravchenko --- www.kravchenko-audio.com
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Default Placement is Number One

Proper placement s the difference between good bass and almost no bass. I've had clients that swore that their sub was'nt working and with a little shifting in the room they became very happy. EXPERMENT!!!!!!

Mark
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Old 13th May 2004, 06:00 PM   #6
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Quote:
Is placement that important when using two subs in room to cancel out standing waves?
Yes.
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Old 13th May 2004, 09:35 PM   #7
Paul W is offline Paul W  United States
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There are some excellent bass/room articles on the Harmon International site (I don't have the link on this computer). One deals specifically with multiple subs...you may find it helpful.

Twin IB subs
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Old 14th May 2004, 05:34 AM   #8
Ap is offline Ap
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I use dual subs:
compared to a single it is harder to integrate with the mains, but the sub output is obviously greater & fills the room a lot more (as one would expect)
I xover at 60hz, localisation starts to happen around 80.
I find 100hz is way too high, even if the mains are really small.
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Old 14th May 2004, 10:14 AM   #9
sunil is offline sunil  India
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OK, if localization starts to happen around 80hz & I crossover at 60hz or less, I have to "LInkwitz" the current setup so it does'nt start falling off below the crossover point.

Is that correct ?
Any adverse affects expected ?
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Old 14th May 2004, 10:17 AM   #10
sunil is offline sunil  India
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Ap,

Why is it difficult to integrate with the mains ? Do you have an active cross from mains to subs ? I want to add a 4th leg to my active crossover, so the output below the crossover point is negligible.

cheers,
sunil
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