Re: LFR1100 Actives hum
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Joined: Jul 2006
Posts: 12,077 Likes: 7
Founder, Axiom Upgrade Club shareholder in the making
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OP
Founder, Axiom Upgrade Club shareholder in the making
Joined: Jul 2006
Posts: 12,077 Likes: 7 |
Charles, I would try connecting the same channel's DSP and ADA to the filter. That way, they will both be supplied from the same potential voltage. That was one of the configurations I tried. Same result.
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Re: LFR1100 Actives hum
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Joined: Jul 2006
Posts: 12,077 Likes: 7
Founder, Axiom Upgrade Club shareholder in the making
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OP
Founder, Axiom Upgrade Club shareholder in the making
Joined: Jul 2006
Posts: 12,077 Likes: 7 |
How is the sub connected? To dsp or AVR? By xlr or rca? 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.
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Re: LFR1100 Actives hum
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Joined: Sep 2009
Posts: 1,901 Likes: 101
connoisseur
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connoisseur
Joined: Sep 2009
Posts: 1,901 Likes: 101 |
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
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Re: LFR1100 Actives hum
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Joined: Jul 2006
Posts: 12,077 Likes: 7
Founder, Axiom Upgrade Club shareholder in the making
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OP
Founder, Axiom Upgrade Club shareholder in the making
Joined: Jul 2006
Posts: 12,077 Likes: 7 |
Cv, try disconnecting the sub and the internet from the avr. 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.
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Re: LFR1100 Actives hum
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Joined: Jan 2007
Posts: 10,490 Likes: 116
shareholder in the making
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shareholder in the making
Joined: Jan 2007
Posts: 10,490 Likes: 116 |
Charles, are you using ADA-1500s or ADA-1250s?
House of the Rising Sone Out in the mid or far field Dedicated mid-woofers are over-rated
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Re: LFR1100 Actives hum
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Joined: Jul 2006
Posts: 12,077 Likes: 7
Founder, Axiom Upgrade Club shareholder in the making
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OP
Founder, Axiom Upgrade Club shareholder in the making
Joined: Jul 2006
Posts: 12,077 Likes: 7 |
Charles, are you using ADA-1500s or ADA-1250s? 1500s.
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Re: LFR1100 Actives hum
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Joined: Jan 2007
Posts: 10,490 Likes: 116
shareholder in the making
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shareholder in the making
Joined: Jan 2007
Posts: 10,490 Likes: 116 |
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.
Last edited by Mojo; 10/15/20 12:38 AM.
House of the Rising Sone Out in the mid or far field Dedicated mid-woofers are over-rated
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Re: LFR1100 Actives hum
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Joined: Sep 2009
Posts: 1,901 Likes: 101
connoisseur
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connoisseur
Joined: Sep 2009
Posts: 1,901 Likes: 101 |
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Re: LFR1100 Actives hum
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Joined: Aug 2007
Posts: 118
veteran
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veteran
Joined: Aug 2007
Posts: 118 |
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.
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Re: LFR1100 Actives hum
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Joined: Jul 2006
Posts: 12,077 Likes: 7
Founder, Axiom Upgrade Club shareholder in the making
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OP
Founder, Axiom Upgrade Club shareholder in the making
Joined: Jul 2006
Posts: 12,077 Likes: 7 |
I apologize for not responding sooner Charles. 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.
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