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Post by House on Dec 20, 2011 10:59:07 GMT -5
i just thought id throw another piece of beef in this already sour stew....
Both My XPA-2's CLICK! after about 30 minutes of being used.......Oh and they are bridged AGAIN now LMAO.
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Post by roadrunner on Dec 20, 2011 17:47:37 GMT -5
Rickie
I don't know if this is your problem, but about thirty years ago I had a similar buzz that only lasted a minute of two after powering up the system. After much trouble shooting I was unable to find any obvious reasons and started picking the minds of the better repair shops and speaker manufacturers. The only explanation that seemed to hold water was that the buzz was coming from the voice coils and once they came up to operating tolerances the buzz went away.
I was told that if the buzz worsened or lasted longer and longer I would need to replace the driver. Over the following two years there was no change in behavior and at that point I sold them and upgraded to other speakers. I never replaced the drivers to see if that was the issue or not, but that was the only explanation I ran across that sounded plausible.
Maybe Lonnie can massage that explanation to see if it sounds plausible to him.
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Post by monkumonku on Dec 20, 2011 17:56:43 GMT -5
Rickie I don't know if this is your problem, but about thirty years ago I had a similar buzz that only lasted a minute of two after powering up the system. After much trouble shooting I was unable to find any obvious reasons and started picking the minds of the better repair shops and speaker manufacturers. The only explanation that seemed to hold water was that the buzz was coming from the voice coils and once they came up to operating tolerances the buzz went away. I was told that if the buzz worsened or lasted longer and longer I would need to replace the driver. Over the following two years there was no change in behavior and at that point I sold them and upgraded to other speakers. I never replaced the drivers to see if that was the issue or not, but that was the only explanation I ran across that sounded plausible. Maybe Lonnie can massage that explanation to see if it sounds plausible to him. Thanks. So you are thinking it may be in the speaker? When you had this problem, did you try switching out the speakers to see if that made any difference? I guess I can try doing that although I don't have any non-Mirage speakers anymore. I guess that's a good reason to go out and get some Salk Songtowers. ;D |
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NorthStar
Seeker Of Truth
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Post by NorthStar on Dec 20, 2011 18:21:03 GMT -5
1. The buzz you hear on start up is he same for me too. gone after a minute or 2.it is only from one amp/speaker and when i swap them around with other amps it follows, so definitely Amp. Also tried with all sources disconnected. Same. also keen to hear any feedback on the cause. on the clicking... mine do it. I've had my amps apart many times replacing LED panels, and yep there is some pretty big heat-sinks in there along with a lot of differing metals so can see why. Acceptable to me from a design perspective? no not really. living with it... i think i am way worse company so yeah no problem. 2. they also make gobs of good noise too. 1. I believe it's normal with many amps from various manufacturers; in my personal experience. [You can always leave your amps ON, permanently.] 2. That's the GOOD compensation side of it.  * If you set your monoblock amps on floor stands near their respective loudspeaker; with good floor isolation; you will eliminate the noise resonances from walls and shelves of your audio racks, and let your amps freely breathe, just the way they supposed to. |
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NorthStar
Seeker Of Truth
"And it stoned me to my soul" - Van Morrison
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Post by NorthStar on Dec 20, 2011 18:32:03 GMT -5
And remember; 1,000+ Watts RMS (into 4 Ohms) with 32 dB Gain equals to some logical physics. Action, Reaction, & Interaction (Electrical) with the rest of your electronic components, including your loudspeakers. Some amps might be perhaps more quiet, with less power and gain; and some of them also cost $100,000! Make your play... |
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Post by 12elfthfloor on Dec 20, 2011 22:02:57 GMT -5
LOTR, just to let you know their habitat.
The amps are on their own independent stands, 2 inches away from the marble floor, and on spikes. The walls side and back are 1.8 meters away, the ceiling is 3 metres away. They are on an independent electrical circuits. Cables whilst stock are elevated.
The front end is on the other side of the room about 6 meters away.
There is no other equipment next to them except for the speakers, (lovely things that they are).
The average room temp is 25 -30 degrees. I have also left the Amps running from a Friday till the following Monday just for shits and giggles.
... click click click. dont get me wrong its not so regular i can dance to it, just random.
But no worries, i'm even considering a second pair for bi-amping. But will be asking for a lifetime of replacement LED panels :-)
The buzz: definitely would like to know more. It is specifically the amp, and i have a curious mind to such matters.
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NorthStar
Seeker Of Truth
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Post by NorthStar on Dec 20, 2011 22:20:46 GMT -5
I was simply using your post to address all the other readers. ...Because you seem to be a really down to earth individual.  {You have the right attitude; you don't give up, to the contrary, you are still going up.} |
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Post by 12elfthfloor on Dec 21, 2011 0:20:08 GMT -5
Thats cool i presumed as much but your post was very relevant and mighty decent of you, so out self interest based on a desire to learn more i thought id like to respond.
Speaking of learning... i just found something nearly as controversial as speaker cables... record cleaning machines and which variety. a lighter moment did prevail when I read a post where some poor chap told the world he changed the power cable on his RCM and swore he could tell the difference. He also asked for opinions.
oh my... the responses... definitely haven't laughed that hard in ages.
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Deleted
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Post by Deleted on Dec 21, 2011 0:29:51 GMT -5
Well, you could get a class D amp thats the same power as the xpa-1, though it's only 12 pounds and barely gets warm and sounds fantastic. Who would want that though right?  |
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hemster
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Particle Manufacturer
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Post by hemster on Dec 21, 2011 1:19:44 GMT -5
Well, you could get a class D amp thats the same power as the xpa-1, though it's only 12 pounds and barely gets warm and sounds fantastic. Who would want that though right? Likely the same person that wants to shed some weight from their wallet! |
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Post by monkumonku on Dec 21, 2011 16:54:03 GMT -5
Okay, so I thought maybe the buzz I hear when starting up the XPA-'s might be in the speaker cable. So I disconnected that cable from the XPA-1 and now when I turn on the amps, there is no more buzz coming from the speakers. That seems to have solved the problem.
Just to be sure, I put the cable back on the XPA-1 but this time disconnected it from the speakers. And sure enough, the buzz disappeared.
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NorthStar
Seeker Of Truth
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Post by NorthStar on Dec 21, 2011 16:56:35 GMT -5
I knew it all along! |
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Deleted
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Post by Deleted on Dec 22, 2011 15:57:12 GMT -5
Well, you could get a class D amp thats the same power as the xpa-1, though it's only 12 pounds and barely gets warm and sounds fantastic. Who would want that though right? Likely the same person that wants to shed some weight from their wallet! it's actually $200 cheaper for 2! |
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Post by 12elfthfloor on Dec 22, 2011 17:12:51 GMT -5
Okay, so I thought maybe the buzz I hear when starting up the XPA-'s might be in the speaker cable. So I disconnected that cable from the XPA-1 and now when I turn on the amps, there is no more buzz coming from the speakers. That seems to have solved the problem. Just to be sure, I put the cable back on the XPA-1 but this time disconnected it from the speakers. And sure enough, the buzz disappeared. I don't quite understand this, can you clarify? You saying that you changed your speaker cable with another cable and the buzz went away? |
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Post by monkumonku on Dec 22, 2011 17:29:44 GMT -5
Okay, so I thought maybe the buzz I hear when starting up the XPA-'s might be in the speaker cable. So I disconnected that cable from the XPA-1 and now when I turn on the amps, there is no more buzz coming from the speakers. That seems to have solved the problem. Just to be sure, I put the cable back on the XPA-1 but this time disconnected it from the speakers. And sure enough, the buzz disappeared. I don't quite understand this, can you clarify? You saying that you changed your speaker cable with another cable and the buzz went away? No, actually I was just trying to be funny to see if anyone noticed.. I was saying that I disconnected the cable completely from the speaker to the amp and then the buzz went away. I guess I should have added that all the rest of the sound went away too. I really haven't tried anything else from what I originally did to try and eliminate the buzzing. I have some locking banana plugs I intend to install this weekend but I doubt that this is going to make any difference. I just got the plugs because they look nice. |
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ske
Minor Hero
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Post by ske on Dec 22, 2011 17:57:45 GMT -5
This is a 2 for 1 thread. Clicking and buzzing! I too have the buzzing issue. It will happen at 2 different times. If I start playing music as soon as I switch on the amp, in about 1 minute the music will get fuzzed out for about 15 seconds and then ease back to normal within about another 30 seconds. The other time it happens is even stranger. My XPA-2 is downstream of my UPA-2. The UPA-2 has a cool pass-through feature for the pre-amp input. The signal goes from the receiver to the input of the UPA-2, then from the UPA-2 output to the XPA-2 input. The UPA-2 provides music to other parts of the house, and the XPA-2 to the living room only. This setup reduces the complexity of my multi-room system. Last night I had both amps on at the same time during dinner in order to warm up the XPA-2 for later use that night (see below regarding warming up). Later on, with music still playing, I turned off the UPA-2 while leaving the XPA-2 on. The exact same issue I described before happened again. Strange, but I'm not all that concerned. I am curious as to what it is though. I also wonder if Lonnie thinks these message boards are such a great idea? The clicking sound is a whole other story (XPA-2). If Emotiva can reproduce the issue at their shop, then they will probably replace the heatsinks. Murphy’s Law guarantees they will not be able to reproduce it, and you will be out the $$ for shipping, and worried about damage in transit. Besides, what if the new heatsinks are worse than the originals? Murphy’s Law again. I have all the screws (including on the straps inside) barely finger tight. I also warm the amp up for a while before use. Allowing the metal to slowly settle in. My guess is that if I left the amp on 24/7, there would be no clicking. Just as there is not clicking when the amp is off 24/7. Maybe I should try that… In all honesty, I can say the clicking now does not occur every time I use the amp. If I do hear it happen, I just say to myself, “I’m not hearing that…†I am glad to read in this thread that there are high-end amps out there that have the same heatsink clicking issue. Funny how that works... |
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Post by roadrunner on Dec 22, 2011 17:59:01 GMT -5
Rickie,
Just a thought. Have you tried de-coupling the amp from the surface they are sitting on? It is possible the buzz is coming from resonance and are no longer audible after a period of warming up. I have cured similar problems in the past by decoupling the power amps. Worth a try...
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Post by 12elfthfloor on Dec 22, 2011 18:02:08 GMT -5
Ha ha Thought so... Never reread a post so many times. I tried different cables all sorts of crap, still there.
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Post by monkumonku on Dec 22, 2011 18:22:53 GMT -5
Rickie, Just a thought. Have you tried de-coupling the amp from the surface they are sitting on? It is possible the buzz is coming from resonance and are no longer audible after a period of warming up. I have cured similar problems in the past by decoupling the power amps. Worth a try... Thanks for the suggestion. But the thought of trying to decouple a 75 lb. box sort of doesn't appeal to me. ;D I could try and lift up each corner and slide one of those sorbothane (sp?) vibration reducers under each foot but then my back and rest of my body would probably be resonating with pain. ;D Do you really think that could be a problem? Right now the amps are sitting on wood shelves made by Studiotech. |
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hemster
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Post by hemster on Dec 22, 2011 18:30:35 GMT -5
^ Pain? That what they make Ibuprofen for! No pain, no gain! I suffered a neck strain for a week when I painted my ceiling and put the projector up. |
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