manifold resonance due to depth of manifold

[ross]

I have seen people mention a resonance in manifolds due to the depth. I have yet to see a plot showing this, so I don' know the severity of the resonance. Any links that show this?

What is the formula to determine this resonance frequency?

I have seen a few manifolds that are several drivers but nobody mentions the resonance as a problem in their designs. Is it just a minor design concern?

[ThomasW]

Odd I've seen one person in your AVS thread menton this. To bad he wasn't around in 1998 when I ask for assistance designing 12 Shivas Dancing.

Tom Nousaine however was available and he saw no issues with the design. He (Nousaine) said he had a cavity resonance with his 8' tall IB, that resonance was 71Hz. My manifold is 1/2 the height of his so if there's a resonance it's not 45-50Hz.

This is a non-EQed nearfield swept sine measurement made with a calibrated $5000 microphone



As for the rest of this take it up with DIY Speaker Guy on AVS, he posted several programs he says can be used to 'sim' this so called problem...

PS: DIY Speaker Guy also claims he saw measurements taken on both sides of the baffle. I took all the measurements and none were taken on the rearwave side

BTW none of this applies to your IB.