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Old 17th February 2009, 08:46 PM   #1
bastek is offline bastek  United States
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Default My xover board is buzzing!

I was checking the woofer section of my Sigmas and playing with stuffing. With the woofer still connected but out of the cabinet, i noticed a buzzing sound in sync with the music coming from the woofer x/o board which is separate from the mid-high section, with separate input posts. This happens only with the volume at about 11-12 o'clock position, if i go any higher the amp goes into protection mode. Both left and right speakers make the noise. Is this normal? Note that i can hear distortion from the woofer before the crossover starts buzzing.
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Old 17th February 2009, 09:11 PM   #2
DcibeL is offline DcibeL  Canada
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If your crossover has ferrite core inductors (anything that isn't air core), it's possible that you are saturating the core, which will cause the inductor to vibrate.

Recommendation: turn it down!
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Old 18th February 2009, 05:51 PM   #3
Pano is offline Pano  United States
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Yep - coils will sing! I've heard it before. (But not with aircore, IIRC). - - As Dcibel mentions.

Are they aircore?
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Old 18th February 2009, 08:25 PM   #4
knorke is offline knorke  Germany
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Air coils will sing to. The windings will vibrate due to magnetic forces. Foil capacitors sing also, the foil vibrates due to electrostatic forces. Hook up a coil or
cap with a series resistor directly to the amp, crank up
the volume. You will hear the (distorted) music!
What do we learn: mechanical stability of crossover parts is important.
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