I have a James loudspeaker a2.1 amp with a humming noice on the .1 (Subwoofer) output, sounds very much like wind blowing and it comes and goes but never disapear complitly.
I have no idea what kind of amp it is but my gues is chip class ab or class d amp, it has a Switch mode power supply if it makes any differens.
Any suggestion where to start the localisation of the problem.
The sub channel has a phase 0/180 degree button on the front. When I press that button it gives som scratching noice.
My hope was a cold soldering but after trying to resolder the legs to that bitton it stays the same as before.
James loudspeaker does not answere my e-mail or messenger messages. I have no schematics for the amp.
Where to start?
I have no idea what kind of amp it is but my gues is chip class ab or class d amp, it has a Switch mode power supply if it makes any differens.
Any suggestion where to start the localisation of the problem.
The sub channel has a phase 0/180 degree button on the front. When I press that button it gives som scratching noice.
My hope was a cold soldering but after trying to resolder the legs to that bitton it stays the same as before.
James loudspeaker does not answere my e-mail or messenger messages. I have no schematics for the amp.
Where to start?
I will post some picture of the internals later today.
I checked all the caps for leakage and bulges, but I can’t find any.
Allso tried to find suspicious soldering but I can’t see any of those either.
Love the amp and its features, 2.1 amp with 12 db xo and level settings. So damn flexible and crisp sound when working
I checked all the caps for leakage and bulges, but I can’t find any.
Allso tried to find suspicious soldering but I can’t see any of those either.
Love the amp and its features, 2.1 amp with 12 db xo and level settings. So damn flexible and crisp sound when working
The sub channel makes a popping sound when powering off. The stereo channels are quite when powering off
