Official Rythmik Audio Subwoofer thread - Page 582 - AVS | Home Theater Discussions And Reviews
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post #17431 of 17433 Unread Today, 06:40 PM
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Originally Posted by rcohen View Post
The only other thing I can think of is that multiple subs can result in more seat to seat consistency.

I'm not sure why "only one" room mode isn't a concern, though. The main concern with room modes is when you have nulls. Peaks are easier to deal with.
When I added my second sub I definitely gained more seat to seat excitement throughout the room.

Receiver - Denon 4311CI
Speakers - Infinity P363's, PC351, P153's
Subs - Rythmik FV15HP's
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post #17432 of 17433 Unread Today, 08:10 PM
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Originally Posted by rcohen View Post
The only other thing I can think of is that multiple subs can result in more seat to seat consistency.

I'm not sure why "only one" room mode isn't a concern, though. The main concern with room modes is when you have nulls. Peaks are easier to deal with.
Thanks for the response, man.

I haven't measured, but using a room mode calculator, in theory I'm supposed to have a 63 hz 1st axial width mode. If I understand correctly, if a place one subwoofer in the pressure minimum of the mode, it won't excite the mode and there won't be a room mode null at the listening position, as our couch can be moved frontwards or backwards to stay away from the length modes. From what I understand, I could also use 2 subwoofers to mitigate that room mode by placing one subwoofer on the left side of the room at the high pressure region of the mode and one on the right side of the room at the high pressure region of the same mode to cancel it out.

http://forum.blu-ray.com/showthread.php?t=48286

After I get the sub and am able to do measurements, I may find sub 80hz room modes at the second axial width mode as well, but as of right now it looks as though I could place one sub in the middle of the front or back wall and cancel out that mode that would hinder my subwoofer performance at the listening position.

As of right now it looks like I'm leaning toward the F12 and if after I measure and happen to come across another sub 80hz mode, I will pick up another F12 down the road.

Thanks for the input.
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post #17433 of 17433 Unread Today, 08:25 PM
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Originally Posted by johnnymacIII View Post
Thanks for the response, man.

I haven't measured, but using a room mode calculator, in theory I'm supposed to have a 63 hz 1st axial width mode. If I understand correctly, if a place one subwoofer in the pressure minimum of the mode, it won't excite the mode and there won't be a room mode null at the listening position, as our couch can be moved frontwards or backwards to stay away from the length modes. From what I understand, I could also use 2 subwoofers to mitigate that room mode by placing one subwoofer on the left side of the room at the high pressure region of the mode and one on the right side of the room at the high pressure region of the same mode to cancel it out.

http://forum.blu-ray.com/showthread.php?t=48286

After I get the sub and am able to do measurements, I may find sub 80hz room modes at the second axial width mode as well, but as of right now it looks as though I could place one sub in the middle of the front or back wall and cancel out that mode that would hinder my subwoofer performance at the listening position.

As of right now it looks like I'm leaning toward the F12 and if after I measure and happen to come across another sub 80hz mode, I will pick up another F12 down the road.

Thanks for the input.
If you have a closed rectangular room, the free REW room simulator is helpful for experimenting with different placement and numbers of subs.

http://www.hometheatershack.com/foru...o-support.html
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Rythmik , Rythmik Audio , Rythmik Audio F12 Direct Servo Subwoofer , Rythmik Audio F15 Subwoofer

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