What is causing this noise from my sub? (Clip included)

**tbird2340** · 09-08-2010, 02:22 PM

I have a strange noise that comes out of my sub but it's not all the time.. It's also not every day.. I had thought it may be my phone but if that was the case I would think it would be more consistent as I always have my phone with me and it's always syncing..

Anyone have any ideas what could be causing this?

http://www.youtube.com/v/Q0apEdRC6-0

**djvillar** · 09-08-2010, 04:12 PM

Throw in a different sub and see if it still occurs.

**tbird2340** · 09-08-2010, 04:27 PM

Could that be it? I don't have another sub to try...

**Machinehead** · 09-08-2010, 04:50 PM

It almost sounds like the noise a ported sub makes when the port is sized too small.

**tbird2340** · 09-08-2010, 06:28 PM

No I don't think it's anything with the port. It's definately a sound from the sub. Almost like Morris code.

**SNOtwistR** · 09-08-2010, 07:17 PM

sounds like feedback from microphone. have you muted line in and mic just to see? just my 2 cents SNO

**drewbp** · 09-08-2010, 10:04 PM

What kind of cross over and amp are you using. It is a higher pitch sound than a cross over should allow to even get to the sub, so it is either on the output of the crossover or the amplifier, or interference in the power supply cabling to either. Do you have another amp you can try with the sub and crossover. If it is still there, then it would be the crossover. If it is not then it would be your amp.

**HiJackZX1** · 09-10-2010, 09:20 AM

Originally Posted by SNOtwistR

sounds like feedback from microphone. have you muted line in and mic just to see? just my 2 cents SNO

Thats what it sounds like to me too...... Lie the mic is too close to a speaker and causing feedback. Have you checked to see if you mic input is muted or not?

**OldSpark** · 09-10-2010, 11:22 AM

FYI - that voltmeter fluctuates a lot, and gets over 14.4V etc.
What is it monitoring?

If it's ignition or dash, make sure your ground connections (chassis-engine-battery-) are properly connected and sized - especially if the alternator is sensing battery voltage!

**david69leonard** · 09-10-2010, 11:43 AM

Does it make a "pop" when you turn the volume all the way to zero or turn off the HU? It almost sounds like your HD is causing the interference, the frequency is pretty high, do you have the amp set to full, highpass or lowpass, you might be able to eliminate that sound with your amp if you set it to lowpass and adjust the frequency to 50hz or lower