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Low frequency in room cancellations [message #38253]

Wed, 11 September 2002 13:46

Anonymous

If you have multiple subwoofer boxes (low pass 60hz) in
the same room seperated by great distances (within reason),
will the low end cancel out or is it better to group the boxes
together, ie do people place one subwoofer in each corner of the
room or both in the same corner?

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Re: Low frequency in room cancellations [message #38254 is a reply to message #38253]

Wed, 11 September 2002 15:06

Robert Hamel
Messages: 93
Registered: May 2009

Viscount

Well from what I have read you are better off in seperate room placements. You can use multiple subs with diferent placements to smooth the overall room response. Takes some set-up time and measurement tools but it can be done. Stereophiles Guide to Home Theater had a excellent article explaining how to do it. If I can find it I will let you know what issue.

Regards Rob

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Re: Low frequency in room cancellations [message #38255 is a reply to message #38253]

Wed, 11 September 2002 15:30

Wayne Parham
Messages: 18789
Registered: January 2001

Illuminati (33rd Degree)

If the room is large enough that the room modes all fall below the passband, then the sound acts as a reverberent field. In that case, you would want to setup speakers for constructive reinforcement, where possible. You might want to have banks of loudspeakers, left and right perhaps, and group them so they combine constructively in the middle, over as wide a range of the listening area as possible.

If the room is small enough that the Schroeder frequency is in the passband, i.e. some bass is in the modal range of the room, then you might want to distribute subs to form dense interference. The idea is to align the nodes of some subs with the anti-nodes of others. Basically, you want to average the sound field using several bass sound sources distributed around the room. Line the subs up along the stage rather than grouping them together on the left and the right.

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Re: Low frequency in room cancellations [message #38256 is a reply to message #38253]

Wed, 11 September 2002 16:39

mrrjm
Messages: 3
Registered: May 2009

Esquire

I know I'm not an expert at this. I read in a Pro-sound manual that subwoofers should be placed right next to each other. It had something to do with the wavefronts colliding. However I don't have any personal experience with this.

Ray

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