PCB Blog

My Speaker Is Making A Strange Noise?

why is my speaker making a strange noise. the noise is like the sound that the speaker makes if it there is an interference of the signal and it just happens when i play some music with “big bass”. it is just on one speaker. at first, it comes from the left channel but when i interchanged the connection of the 2 channels, the noise from the left is gone but the right channel is now the one making that noise. i’m using a 20w+20w amplifier that i personally assembled and 2 component speakers.
i’m using this amp for about a year now and this problem just happened today. could it be that there is a problem on the pcb? if there is, can u tell me what it is so i can fix it…

2 Responses to “My Speaker Is Making A Strange Noise?”

1. Paul in San Diego Says:
   October 30th, 2009 at 6:49 pm

   I concur with Magyver. With that low power of an amp, it would easily saturate at high output levels. When an amp saturates (clips), it has nearly a DC output that can quickly fry a speaker voice coil that’s rated at much higher power levels. It can also cause the voice coil to separate from the cone, resulting in a buzzy or raspy sound at high volume levels, particularly with the bass.
   When you swapped out the speaker from one output to another and still had the problem, this indicates that the problem is in the speaker and not the electronics driving it. I would say that you have a blown woofer that needs to be replaced.
   The good news? Cheap speakers are cheap to repair.

2. Magyver Says:
   October 31st, 2009 at 12:27 am

   When you changed channels with your speakers, and the problem changed channels, you proved the problem is in the speaker.
   It must have a driver going bad.

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