My xover board is buzzing!

bastek · 17th February 2009, 08:46 PM

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.

DcibeL · 17th February 2009, 09:11 PM

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!

Pano · 18th February 2009, 05:51 PM

Yep - coils will sing! I've heard it before. (But not with aircore, IIRC). - - As Dcibel mentions.

Are they aircore?

knorke · 18th February 2009, 08:25 PM

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.

17th February 2009, 08:46 PM	#1
bastek diyAudio Member Join Date: Dec 2005 Location: NY	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.

17th February 2009, 09:11 PM	#2
DcibeL diyAudio Member Join Date: May 2003 Location: Saskatchewan	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! __________________ The power of Science compels you!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Sure Electronics New Tripath Board 4*100W class-D Amplifier Board	7788q	Class D	312	18th May 2012 01:32 AM
Buzzing Pre-amp	stevebell	Solid State	10	12th June 2008 03:26 PM
My Cambridge 500SE, needs an output board (to replace internal DAC Board)	slbender	Digital Source	0	15th May 2008 01:36 AM
buzzing problems	specter73	Solid State	13	28th October 2005 07:46 AM
Buzzing in A40	NickC	Pass Labs	9	25th August 2003 11:42 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

18th February 2009, 05:51 PM	#3
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	Yep - coils will sing! I've heard it before. (But not with aircore, IIRC). - - As Dcibel mentions. Are they aircore?

18th February 2009, 08:25 PM	#4
knorke diyAudio Member Join Date: Dec 2004 Location: Eichstetten	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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)