I have a 5.1 audio system set up. Recently I notice the subwoofer will make popping noise after playing for 10 to 20 minutes. It can be solved by turning off the the subwoofer, unplug the audio cable. But the noise will come back.
If I only turn off the subwoofer for 30 seconds and let the capacitor runs out of power and turn it back on, the noise will come back noticeably much sooner, in about 3 to 5 minutes.
I tried to plug the subwoofer directly to a laptop, a phone, and a bluetooth player via an adapter (the subwoofer only accept RCA Audio input and has external power), similar situation also happens but sooner. On a laptop or a bluetooth player, it will start making noise in about 5 to 10 minutes, and on a phone it will start making noise in about 10 minutes.
I suspect it could be either a failure of the RCA input or something wrong with the capacitor. How should I trouble shoot this?
I am happy to provide photos of the board inside of the subwoofer if need be.
P.S., I just remembered something. I recently resoldered the RCA socket since the original one gone bad and I had to replace it. Would it be possible the RCA socket was soldered poorly so it created a current?
P.P.S. Not sure if this is off topic. It seems to have something to do with the sound design.