rontj
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Post by rontj on Oct 31, 2013 17:38:34 GMT -5
I power on my receiver, and the 12DCV trigger passes from my receiver to my XPA5. After a few seconds pause, the blue light of the amp powers on, followed by a single "click" from the amp, with about a couple seconds pause, followed by a rapid "click-click", then another 3-4 second pause, then I hear medium-level hissing out of my speakers (not sure if all 5 or not) for about 1/4 to 1/2 second. Then all is fine and ready to roll. I guess I assumed there would be no clicking, and no hissing from my speakers. Being my first-owned dedicated amp, is this normal behavior? Thanks.
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Post by frenchyfranky on Oct 31, 2013 17:44:44 GMT -5
All the click are from normal start-up relay operation, for the hiss I don't think.
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Post by macromicroman on Oct 31, 2013 17:47:46 GMT -5
When I power on my Pioneer VSX-52 the trigger switches turn on both my XPA-5 and UPA-200. ON the XPA-5 I get a click and then red lights going from left to right. The red lights then turn blue. On the UPA-200 don't get red lights only a click and then two blue lights. I get no hissing sound from the speakers.
Hope this helps
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rontj
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Post by rontj on Oct 31, 2013 17:49:48 GMT -5
All the click are from normal start-up relay operation, for the hiss I don't think. OK, good to know. I'm unable to get the hissing to duplicate at any time other than at amp power-on. And it's always for the same short 1/4-1/2 second duration. Thanks for your response. |
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Post by frenchyfranky on Oct 31, 2013 18:02:53 GMT -5
All the click are from normal start-up relay operation, for the hiss I don't think. OK, good to know. I'm unable to get the hissing to duplicate at any time other than at amp power-on. And it's always for the same short 1/4-1/2 second duration. Thanks for your response. The hissing intrigue me but I don't think that it is important, if you're in doubt, it is better to contact Emotiva. |
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stiehl11
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Post by stiehl11 on Oct 31, 2013 18:06:38 GMT -5
I get the same momentary hissing from my UPA-2. To me, it's not a major issue and it is no louder or softer regardless what I have the volume at.
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rontj
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Post by rontj on Oct 31, 2013 18:26:03 GMT -5
I get the same momentary hissing from my UPA-2. To me, it's not a major issue and it is no louder or softer regardless what I have the volume at. Exactly. Same here. It always suddenly begins, and suddenly ceases. I've tried changing inputs on my AVR, no change in hissing. I'm not too concerned about it, but do think I'll call Emotiva tech and ask what their thoughts are. |
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Post by geebo on Oct 31, 2013 19:53:15 GMT -5
With my XPA-5 I get one click, red lights come on in succession, then the blue lights come on and it's ready. No hiss.
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Post by zenithblue67bug on Nov 1, 2013 2:00:00 GMT -5
With my XPA-5 I get one click, red lights come on in succession, then the blue lights come on and it's ready. No hiss. Identical description on how my xpa-5 works. FWIW, mine is a gen 1. |
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Post by wizardofoz on Nov 1, 2013 9:50:05 GMT -5
Does it hiss when the rca are disconnected...or try switching the inputs to bal instead of unplugging the rca's, it it goes away then maybe its the preamp/prepro outputs hissing
Maybe the pre outs are not muting like the speakers on the avr do
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Post by Dark Ranger on Nov 1, 2013 15:53:07 GMT -5
My XPA-200 hisses for about 0.25 - 0.5 seconds along with several clicks each time it's turned on. The hiss occurs just before the two red LEDs switch to blue. It's done this from day one. However, it's also the only Emotiva amplifier I own that hisses at start-up. Not sure why it does, but it's not a concern because the XPA-200 works just fine.
I wouldn't worry about it, but do contact Emotiva if you're curious about it. I'd be interested what they say.
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Post by Gary Cook on Nov 1, 2013 16:56:56 GMT -5
What brand and model of receiver? Cheers Gary |
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rontj
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Post by rontj on Nov 1, 2013 20:39:23 GMT -5
Does it hiss when the rca are disconnected...or try switching the inputs to bal instead of unplugging the rca's, it it goes away then maybe its the preamp/prepro outputs hissing Maybe the pre outs are not muting like the speakers on the avr do I'll try changing to balanced, and see what happens. For whatever reason, turned on my system about an hour ago to finish a Blu-ray, and at the point in time when the hissing should have occurred, it didn't. And of course, there is no single variable that has changed that I can identify. As of yet, I've done no troubleshooting. I first wanted to identify if it was expected, and now I know it seems it is not. |
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rontj
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Post by rontj on Nov 1, 2013 20:40:30 GMT -5
My XPA-200 hisses for about 0.25 - 0.5 seconds along with several clicks each time it's turned on. The hiss occurs just before the two red LEDs switch to blue. It's done this from day one. However, it's also the only Emotiva amplifier I own that hisses at start-up. Not sure why it does, but it's not a concern because the XPA-200 works just fine. I wouldn't worry about it, but do contact Emotiva if you're curious about it. I'd be interested what they say. Yeah, very similar (if not identical) to the behavior of my amp. |
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rontj
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Post by rontj on Nov 1, 2013 20:41:05 GMT -5
What brand and model of receiver? Cheers Gary Denon AVR-X4000. |
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Post by Gary Cook on Nov 2, 2013 0:36:35 GMT -5
What brand and model of receiver? Denon AVR-X4000. Ahh, the new model. I seem to recall reading somewhere that they had adjustable trigger delay, if so it may pay to increase the delay (switching on the XPA-5) until the processor is ready to go. I suspect that the Denon is not fully powered up when the XPA-5 starts receiving signals, hence the noise. Cheers Gary |
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rontj
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Post by rontj on Nov 2, 2013 16:25:36 GMT -5
Ahh, the new model. I seem to recall reading somewhere that they had adjustable trigger delay, if so it may pay to increase the delay (switching on the XPA-5) until the processor is ready to go. I suspect that the Denon is not fully powered up when the XPA-5 starts receiving signals, hence the noise. Cheers Gary That is very interesting, indeed, Gary. Coincidentally, I think last night, my speakers did not hiss, and another time (may have been during the same power-on), the amp didn't do the second fast-paced "click-click", only the first click. My point being, that the behavior isn't exactly the same every time. So there is some variable in there. I didn't know about an adjustable trigger delay. I'll look into that. EDIT: Just looked at the manual, and it mentions nothing of any adjustments within the trigger out. |
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rontj
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Post by rontj on Nov 2, 2013 16:41:04 GMT -5
Does it hiss when the rca are disconnected...or try switching the inputs to bal instead of unplugging the rca's, it it goes away then maybe its the preamp/prepro outputs hissing Maybe the pre outs are not muting like the speakers on the avr do I tried balanced, and no change in behavior. All exactly the same. Also tried turning the amp on via the Standby button on the front panel, and again, exact same behavior. Also, noticed, when turning on/off only the amp (not via the 12VDC trigger), that I was aware of a soft "thump" in my speakers when turning off the amp. Probably not aware of it when pressing "all off" on my RTI remote because of the clicking from multiple devices powering off. I'll call Emo tech Monday and see what they say (about brief speaker hiss). |
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Post by wizardofoz on Nov 3, 2013 3:27:31 GMT -5
Odd if it is doing it on balanced input with northing connected, or RCA with nothing else powered up - I don't recall either of my xpa-5's (gen1) making such a hiss noise then being silent. non of my other XPA/UPA amps exhibit such behaviour either.
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rontj
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Post by rontj on Nov 3, 2013 15:00:27 GMT -5
Odd if it is doing it on balanced input with northing connected, or RCA with nothing else powered up - I don't recall either of my xpa-5's (gen1) making such a hiss noise then being silent. non of my other XPA/UPA amps exhibit such behaviour either. Right, which demonstrates that the cause is not signal related. I wonder if the cause is due to my amp being plugged in to my PS Audio power conditioner. The conditioner does have a dedicated single duplex receptacle to keep the heavy current draw of power amps from affecting more sensitive source equipment. But I wonder if that's the cause of the multiple clicking, and the hissing. It's not easy to do, but I think I'll pull out my cabinet and plug my amp straight into the wall to test. |
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