I have Boston Acoustic BA735 computer speakers that are two satellites and a sub-woofer. It’s old but for my purpose worked great for about 20 years. They have been connected to the same workstation pretty much for the last 10 years. Suddenly they have no sound at all. There was a little hum the past year or more but when I was listening to music I didn’t hear it. My hearing isn’t that great due to too many sporting events. The power indicator lights are on, so I think the power supply is good, but they are silent. When I adjusted the volume they used to make a little crackling noise, like the contacts were dirty. Zero noise of any kind now. I thought my PC needed an update or a new driver, but that wasn’t it. I tried a different set of speakers and they work fine. I opened the sub and all caps look good. The power indicator on the sub is also lit. These would be about $100 to get something reasonable but I’m just perplexed. I have a capacitor tester but I’m pretty sure you have to pull them off the board to test properly. I know there are versions of these BA735 speakers that are digital audio only, but mine have an analog and a digital input. I’ve tried other sources of sound without any sound either. They are simple boards and hardly any power. I have re-capped a few amps and sub’s but beyond that I’m clueless how to diagnose this. Everything looks clean and the cables all ohm test good. I’m not too afraid to destroy these trying to fix the issue. This is more of an educational thing for me than anything.
