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Post by The History Kid on Mar 8, 2016 16:40:43 GMT -5
Wanted to get some thoughts from the community before calling in to Emotiva. I bought a UPA-2 from them in April, and it's been running smooth until I noticed a buzzing noise just recently. The sound is not very loud, but noticeable at low levels and emits only from the right channel. There's never any kind of hum from the low-pass drivers, only the horn. So I tried some troubleshooting... - Try the same speaker with the same wire on a different amp (Fusion 8100). I was unable to replicate the issue, ruling out the speaker as a problem.
- Use the same amplifier and plug in a different speaker. The noise was audible in the same capacity with the different speaker.
- Check/fasten connections on the end of the amplifier. This has not worsened nor improved the issue.
What else might I look at? Missing anything, or am I best just to call Emotiva instead? |
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Post by garbulky on Mar 8, 2016 17:24:22 GMT -5
Switch the RCA wire with the other one. Then if that doesn't follow the wire, switch the speaker wires.
Also disconnect the source and see if it still buzzes
Also at the back of the UPA-2 is a gain knob. Wiggle that back and forth a few times to clear out any dust. See if that helps.
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Post by The History Kid on Mar 8, 2016 18:06:10 GMT -5
Will try these things tonight when I get back from class. Can probably test those first two things in a single pass. Never heard of an issue with the gain knob though, that's a new one.
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Post by The History Kid on Mar 8, 2016 18:22:58 GMT -5
Had a moment to check it out actually just now. Seems like it persists regardless of if a source is connected or not.
That being said, does this sound like something in that channel? Kinda bummed at the thought it might have to go in.
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Post by Axis on Mar 8, 2016 19:22:58 GMT -5
If it just the Right Channel like Garbulky says remove all the interconnects for the Left Channel and use them for the Right Channel. A bad interconnect anywhere in the chain can cause a Hum. Isolate it and if it is not associated with another component or cable it is the Amp.
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Post by Axis on Mar 8, 2016 19:50:55 GMT -5
Also do not think of the Channel on the Amp that has a Hum as Left or Right. Example use the left outputs of the source and pre into the channel with hum. Mix it up using only one channel and one speaker.
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Post by The History Kid on Mar 8, 2016 22:11:27 GMT -5
Will give it another go tomorrow, and update you all. Midterm week was a terrible week to find this issue. I'll keep you guys posted!
Thanks for the input!
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Post by knucklehead on Mar 8, 2016 23:45:40 GMT -5
Disconnect everything but the speakers to the amp. If you still have a buzz in that one channel and you've switched speaker wires to rule a bad wire out then it is probably internal to the amp. Sounds like it may be a bad capacitor.
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Deleted
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Post by Deleted on Mar 9, 2016 0:17:34 GMT -5
Will give it another go tomorrow, and update you all. Midterm week was a terrible week to find this issue. I'll keep you guys posted! Thanks for the input! You sure it's not stress from preparing for your midterms?   (Getting a little buzz on probably is not the best way to lessen the stress!) |
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Post by The History Kid on Mar 9, 2016 0:34:06 GMT -5
You sure it's not stress from preparing for your midterms? (Getting a little buzz on probably is not the best way to lessen the stress!) It certainly could be this semester. I've never had midterms like these, they're a nightmare, and two of the classes I'm still trying to figure out what the hell the professors are talking about. Alas, I don't think the sound artifact is related to that though. I can safely say alcohol has nothing to do with my midterms. lol |
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Post by Deleted on Mar 9, 2016 2:37:12 GMT -5
You sure it's not stress from preparing for your midterms? (Getting a little buzz on probably is not the best way to lessen the stress!) It certainly could be this semester. I've never had midterms like these, they're a nightmare, and two of the classes I'm still trying to figure out what the hell the professors are talking about. Alas, I don't think the sound artifact is related to that though. I can safely say alcohol has nothing to do with my midterms. lol Who said anything about alcohol?  However, I do sympathize as in college I had a Chinese PhD calculus professor. His accent was so bad and he covered his mouth with his hand while talking (I have no idea why) that I had no idea what he was saying. Good luck in your exams! |
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Post by The History Kid on Mar 9, 2016 13:49:43 GMT -5
So I disconnected the line in's and tried a new speaker with new wire on that channel, and the buzzing still persists. At this point am I best off calling in and having an RMA set up? Figures ahead of spring break that my power amp would do this...
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Post by The History Kid on Mar 9, 2016 16:29:16 GMT -5
Just spoke with Emotiva - the generally feeling is that it's due to the horns, and a simple noise artifact coming from the room. Since it doesn't change with volume or gain, and it's not going to impact my speakers and is not noticeable at higher levels, I think I'm going to let it go. Sidenote: I did get some good tips for resolving my XDA-2 remote issue.
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