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Old 23rd March 2009, 09:51 PM   #1
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Default Acoustic null test?

If i put two subs facing eachother where one has a reversed phase to see how different they are.
Are there any restrictions on how far apart they must be or anything else i have to think of?
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Old 24th March 2009, 08:34 PM   #2
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make sure they are reasonably close, but not touching

This line up is called Iso-brarik, where the effective Fs of the speaker is lowered, the motor power of the speaker is increased

Apparently, you can use a far smaller box to produce the same sound as just one driver.

Never tried it though.

Good luck.
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Old 25th March 2009, 03:12 AM   #3
Ron E is offline Ron E  United States
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This is not about isobarik, this is about testing for dissimilarity. Quad does this with their ESL's AFAIK.
I would think, within reason, the closer the better. You will want to make some sort of fixture to hold them with the microphone dead center.
IIRC Quad puts the panels at an angle ( A V shape) and puts the mike on a line bisecting the angle.
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