Axiom Home Page Forums General Discussion Stereo LFR1100 Actives hum

That was one of the configurations I tried. Same result.

Subs are connected to the AVR by RCA. All RCA connections are converted to XLR before going into any Axiom gear with adapters just because I'm paranoid about RCA connections being ripped off by too-tight connectors on the ends of cables. It happened a couple of times way back in the day, but I'm still traumatized. Ha ha.

Cv, try disconnecting the sub and the internet from the avr. I assume all the other inputs to the avr are off the same wall socket As the avr ... if not disconnect those as well

rrlev, great instinct. I had already tried disconnecting the ethernet cable from the AVR with no change, but I hadn't tried the subwoofers. Pulling out Sub 1, the hum disappeared almost entirely. Plugging it back in, it was back in full force. Sub 2 pulled, no change. I had re-checked the ground screw on Sub 2 yesterday, but I hadn't yet re-checked the one on Sub 1, since it's more of a pain to pull away from the wall to have access to the back. After I un-screwed it a little more and plugged it back in, I'm treated to the same silence. Whew.

Mojo, I'm so sorry I put you through the mental exercise. I appreciate you putting so much thought into the troubleshooting. But I still have no idea why the hum got worse after introducing the line filter. It wasn't a subtle difference. The only thing I can think is that maybe the power cord of the power strip I was plugging the line filter into bumped the ground screw on the back of the EP800 just enough to make that difference. That's the most plausible thing I can think of.

Replacing an EP800 at around the same time as the upgrade to Actives made me assume the new hum was an Actives thing, especially after reading someone else was having a similar experience with the Actives.

I'd better go enjoy my system before I mess it up again.

Charles, are you using ADA-1500s or ADA-1250s?

1500s.

Rich, that was very good find. I am glad you are noise-free, Charles. Anyone using separate amps for each speaker, and particularly 1250s or 1500s, is in better shape than me for sure. The 1250 and 1500 has better noise rejection than the 1000.

P.S. Charles, that mental exercise was conducted when I first got my actives so no harm done.

Glad everything's good

I apologize for not responding sooner Charles.

I’m the individual who had luck with that specific line filter. In my case I was getting noise injected directly into my ADA1250-5s. No inputs plugged into them, just connected to the speakers.

It would appear that I have crappy wiring in my home and am getting DC noise injected across all electrical circuits, regardless of whether they are dedicated or not. The DC offset did the trick.

Daisy chaining two together actually ended up working best in my environment.

Hope that gives you more context and happy to answer any additional questions.

Hey, no worries. I'm glad we both found our solutions. Once in a while I still have weird sounds (not the hum) coming from my speakers. The next time it shows up, I'll have to remember to record it. It's just once in a while, so it hasn't seemed like a priority.