| Speaker placement software non-rectangular room [message #73678] |
Fri, 06 October 2006 15:37  |
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brandon[2]
Messages: 380
Registered: June 2006
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Senior Member |
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hello,
Does anyone know of a software that will calculate where to put your speakers
in a non-rectangular room?
I have seen plenty of softwares that will do that, but not funny shaped rooms.
Anyone? Please.
Thanks You,
Brandon
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| Re: Speaker placement software non-rectangular room [message #73834 is a reply to message #73678] |
Wed, 11 October 2006 06:00  |
"Kris" .
Messages: 27
Registered: June 2006
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Junior Member |
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Unfortunately, software to do this would be prohibatively expensive for a
single use application. Rectangular rooms have easy analytical (i.e. solved
in equation form) solutions for mode distributions, and the early reflections
are largely predictable. For non-rectangular rooms, the mode distributions
get skewed, and require a kind of finite element brute force mathematical
solution.
That said, keep the following things in mind. Low frequencys (sub 400hz)
are dominated by room mode effects. High frequencies (above 400hz) are largely
directional. If you know the dispersion of your speakers you cn do a pseudo
ray-tracing approach by drawing your room (to scale) on a sheet of paper,
and drawing rays coming out of your proposed speaker positions. As these
rays contact the sides of your room (and ceiling too, remember that your
speakers have vertical dispersion too), they are reflected such that the
angle of reflecton equals the angle of incidence (just like a billiard ball
boucing off the side bumper). Draw the first two reflections for a variety
of rays.
Consider that sound travels at approximately 1 foot per milisecond. Ideally,
there should be very few reflections that come back to the mix position within
the first 20 miliseconds (a good way to help ensure this is to make your
rear wall at least 10 feet back from the mix position). Since your drawing
is to scale you should be able to measure each ray to see what time it arrives
at the mix position. Might be easiest to cut a peice of string to correspond
to whatever length is 20 miliseconds. Sweep the string along the rays starting
at each speaker location...if the string bounces back to the mix position,
you've identified spots on the wall (and ceiling/floor) that are good candidates
for absorbtion.
There's software out there for determining the speaker boundary interface,
and that should still be fairly valid for non-rectangular rooms, as its mainly
considering adjacent walls as extensions of the speaker baffles.
For room modes, I'd say find the rectangular room that best approximates
your room shape and volume, and use that...
Hope this helps.
Cheers,
Kris
"Brandon" <A@A.com> wrote:
>
>hello,
>
>Does anyone know of a software that will calculate where to put your speakers
>in a non-rectangular room?
>I have seen plenty of softwares that will do that, but not funny shaped
rooms.
>Anyone? Please.
>
>Thanks You,
>Brandon
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