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Multi-Way Conventional loudspeakers with crossovers

Box rattles only at 99, 100, and 101hz sine wave
Box rattles only at 99, 100, and 101hz sine wave
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Old 30th April 2012, 09:01 PM   #1
Fusion916 is offline Fusion916  United States
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Default Box rattles only at 99, 100, and 101hz sine wave

My 2 way makes a fairly loud "rattling" at around 100hz, in which I think it is somehow rattling the horn. The woofer and horn are in separate chambers separated by 3/4" mdf. Is horn rattle the likely culprit? I can't tell by listening. This ONLY happens at 99, 100, and 101 hz. 98 and below there is no rattle and 102 and above there is no rattle. Will adding polyfill help with this?

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Old 30th April 2012, 09:33 PM   #2
neutron7 is offline neutron7  Canada
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Maybe something is loose in there, or a wire touching something?

I always like to check fore the simplest things first.
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Old 30th April 2012, 10:24 PM   #3
SpeakerScott is offline SpeakerScott  United States
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Quote:
Originally Posted by Fusion916 View Post
My 2 way makes a fairly loud "rattling" at around 100hz, in which I think it is somehow rattling the horn. The woofer and horn are in separate chambers separated by 3/4" mdf. Is horn rattle the likely culprit? I can't tell by listening. This ONLY happens at 99, 100, and 101 hz. 98 and below there is no rattle and 102 and above there is no rattle. Will adding polyfill help with this?

Have you tried taking the woofer out and playing it free air? I've seen lead in wires rattle against the cone. Also, try taking the tweeter out and playing the tone to see if it's the tweeter.

Scott
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Old 30th April 2012, 10:27 PM   #4
Andrew Eckhardt is offline Andrew Eckhardt  United States
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Have you used a sealant/adhesive behind the horn mount flange?

I've had bad glue between magnet and basket on those woofers. I've had bad glue (missing) at the surround too.

It is difficult to make Certain the flanges of those freaky woofer baskets are not leaky and buzzing without filling the entire cavity underneath with your favorite kind of congealing/hardening goo.

Last edited by Andrew Eckhardt; 30th April 2012 at 10:30 PM.
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Old 30th April 2012, 11:32 PM   #5
speaker dave is offline speaker dave  United States
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Its just as likely that the woofer and baffle are at resonance at that frequency. Get the system rattling and very lightly touch the various surfaces. If it is a cabinet surface in resonance you can't do much about it without serious bracing or modifications. Even if it vibrates, it shouldn't rattle. It might be something internal such as the crossover or some wiring that is actually rattling. With luck you might be ablr to reposition the offending bit or tie it down.
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