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-   -   Is placement that important when using two subs in room to cancel out standing waves? (http://www.diyaudio.com/forums/multi-way/34009-placement-important-when-using-two-subs-room-cancel-out-standing-waves.html)

The Paulinator 13th May 2004 05:08 PM

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?

synergy 13th May 2004 05:15 PM

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

tiroth 13th May 2004 05:17 PM

(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

sunil 13th May 2004 05:35 PM

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

mwmkravchenko 13th May 2004 06:14 PM

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

Timn8ter 13th May 2004 07:00 PM

Quote:

Is placement that important when using two subs in room to cancel out standing waves?
Yes.

Paul W 13th May 2004 10:35 PM

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

Ap 14th May 2004 06:34 AM

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.

sunil 14th May 2004 11:14 AM

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 ?

sunil 14th May 2004 11:17 AM

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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