any buzz or hum on XPA-2?

[Viktor]

Jan 7, 2012 18:12:17 GMT -5 kong73 said:

Have you tried a 3 prong female to 2 prong male cheater plug? This might help eliminate that if it is a grounding issue. My PE 1000 watt amp produces a hum IF I don't use the cheater plug.

Hmm... I'm no electrician, but doesn't that defeat the purpose of grounding?

[pavowren]

[UPDATE]
xpa-2 arrived, unpacked, connected the power cord, turned it on. No buzz/hum. No sound. Then, i pushed the front power button. Still absolutely no sound with my ear laying on the grill. now, i have switched out the old parasound with this HEAVY monster, and all i hear is sweet music!

do i have to register this amp? where is the serial #?

[House]

good question, i still need to register all my emo gear if it needs to be registered lol.

[roadrunner]

Congrats on your new XPA-2. You are going to love listening to music with this power amp. No, you do not have to do anything to register your XPA-2. All you will ever need is your name and date of purchase to receive warranty work.

[apollo7777]

I bought a re-furbished XPA-5 from Emotiva. I was assured that the unit was just a return, and that it would meet all the specs of a new unit. Maybe it does, maybe it doesn't. I don't know what "the specs" are, but this unit emits a loud buzz that can be heard anywhere in the room. I disconnected all cabling except the power cord. Still a loud buzzing. I plugged the amp into another outlet. Loud buzzing. I moved the amp to another room, with nothing connected to it. Loud buzzing.

I called the Emotiva tech support line, and they told me the transformers buzz.

I read about a lot of owners with extremely expensive speakers and processors that use Emotiva amps, and I can't believe that they find this buzzing acceptable. There must be some units that perform fine and others that don't, otherwise people would not use these amps. I wish I could return it, but it's past the 30 days.

Has anyone sent in an amp that buzzed to Emotiva for service, and had the problem corrected???

[pavowren]

as stated earlier, my new xpa-2 is fortunately dead quiet. yes, it seems many amps do buzz or hum, but surely one should not hear it from normal listening position. from what you say, your xpa-5 is defective. as i understand it, it could be mechanical buzz due to imperfect winding or coating of transformer. in this case, all one can try is to dampen it somehow, either outside or inside. if the buzz is electrical, then it's the infamous ground loop. there are tons of suggestions on the net for remedy.

good luck in solving your problem. i know how irritating it can be!

[astrallite]

In my house, it may be a voltage or electrical issue, but all Class A/B power amplifiers (my D-Sonic 1000S ICEPower amp doesn't hum) for some reason have audible hum, at various levels--I mean even with nothing connected to the amp except speaker wire, there will be 60Hz hum coming out of the speakers. None of the receivers I've owned (which is over a dozen) hummed except the Harman AVR 7550HD, which I went through 3 of them and found out they all hummed so its part of the design.

Now I've got the Yamaha RX-Z11 (a total beast), an RX-A3000, a Onkyo 875, and Pioneer SC-55, and none of them hum...I can use any receiver as a pre-pro and another receiver as amp, there's no hum...hook up a power amp, there's hum. Power amp with nothing connected to it, there's hum. I've used cheater plugs and they don't do anything for me, so maybe its voltage ripple and not a ground loop? Who knows.

So my conclusion is, there must be some kind of power filtration (maybe regulator board?) that receiver manufacturers are installing to remove 60Hz cycling hum that power amplifier manufacturers generally don't bother with, and thus, you have hum if your house electricity has some voltage variance with separates, but completely noiseless with A/V receivers.

[garbulky]

Assuming you are not used some sort of line conditioner/ups and are plugging your amp direct to the wall then it's possible you may have some sort of DC on the line. Emotiva's CMX may help if that's what it is. (But I'm no expert on this so grain of salt and all that....)

[mgm]

Try shorting the RCA jack inputs (instead of leaving them open). If the hum is still there, then it is most likely a problem with your amp. Make sure you do the short before turning your amp on, or else you might get a loud thump through your speakers when you touch the inputs.

[sergeantynot]

Feb 15, 2012 3:24:42 GMT -5 apollo7777 said:

I bought a re-furbished XPA-5 from Emotiva. I was assured that the unit was just a return, and that it would meet all the specs of a new unit.

Did you call Emo for their B-stock unit, or was it available on their site? I will be looking to add either an XPA-2 or monoblocks soon. That would be good to know.

[ocezam]

Apr 11, 2013 17:15:57 GMT -5 sergeantynot said:

Did you call Emo for their B-stock unit, or was it available on their site? I will be looking to add either an XPA-2 or monoblocks soon. That would be good to know.

You have to call Emotiva to check pricing and availability of B stock. it's not on the website.


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