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Low frequencies
PostPosted: Mon Jul 06, 2009 1:05 am Reply with quote
Alexis
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Joined: 12 May 2009
Posts: 9




I have a question, I've seen a Meyer speaker (700HP SUB) that has a dll for EASE. However EASE doesn't work with data below 125Hz  and the frequency range of the speaker is 25 Hz - 150 Hz.                                       So, how would it be simulated in a room?
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PostPosted: Wed Jul 08, 2009 4:11 am Reply with quote
davidnewmanaudio
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Joined: 08 Jul 2009
Posts: 1




I've been wondering this myself.

At the moment I am using Meyer's MAPP Online to model sub steering.

("Sub steering" :: search Dave Ratt's blog for "end fire sub array")
(also :: search ProSoundWeb forum for same)

I have a related question which is:
Can EASE model transmission issues?

The venue I am modeling has a large function room with the stage directly underneath the orchestra pit of a musical theatre venue above.
Bass transmission is a major problem both ways.

If anyone has some thoughts on modeling and prediction for the bottom three octaves, I would love to read the thread.

MAPP Online doesn't have the ability to model walls and architecture.
EASE does architectural modeling, but not for the bottom three octaves.

Bottom end transmission is a major problem for many venues.

Your thoughts?

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PostPosted: Wed Jul 15, 2009 5:58 pm Reply with quote
Jim Mobley
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Joined: 27 Jul 2005
Posts: 134
Location: Foothill Ranch, California, USA




None of the room acoustics simulators handle low frequencies (below 100 Hz. or so) yet. This is because at those frequencies, modal behavior dominates and computer horsepower hasn't been up to the calculations involved. This is changing and work is ongoing to add this to EASE 5.0 using the Boundary Element Method of computation.

If you want to do the very simple direct sound array calculations done by programs such as MAPP or Array Show, scale everything to 1/10th and multiply the frequency by 10. So if you wanted to simulate a two-element end-fired array with elements 1 meter apart, place them 0.1 meter apart and then 1 kHz will equal the pattern at 100 Hz., 500 Hz = 50 Hz, etc. This is easily done in the cluster module, see the Tutorial for details. Most subwoofers can be simulated with the Sphere source.

Transmission Loss for faces is also in the works, but this is so dependent on local construction issues that predictions will be more on the order of what's possible than what is actually achieved.

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19201 Cook St.
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TEL: +1-949-588-9997
FAX: +1-949-588-9514
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