Just bought an new Emotiva amp.. buzzing? Help - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 34 Old 03-08-2020, 11:54 AM - Thread Starter
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Just bought an new Emotiva amp.. buzzing? Help

Hello everyone, I just purchased an Emotiva BasX A5175 .. upon hookup I noticed quite an audable buzzing coming from speakers. Checked for cables... other stuff plugged in.. ect.

Finally with it plugged in by itself with just speakers only (nothing on circuit or rca cables) directly to outlet.. still buzzzz.

Anyone experienced this?
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post #2 of 34 Old 03-09-2020, 12:09 AM
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Quote:
Originally Posted by btbed View Post
Hello everyone, I just purchased an Emotiva BasX A5175 .. upon hookup I noticed quite an audable buzzing coming from speakers. Checked for cables... other stuff plugged in.. ect.

Finally with it plugged in by itself with just speakers only (nothing on circuit or rca cables) directly to outlet.. still buzzzz.

Anyone experienced this?
I'm retired electrician so I would first start with power supply. Anything else on the same circuit? Florescent lights? Can you easily plug into a different circuit to test? Have you got one of those cheap outlet testers to check polarity and ground? Like this? https://www.amazon.com/dp/B01EMEZ3J2...erz_origin1-20
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post #3 of 34 Old 03-09-2020, 04:04 AM
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If you have cable tv unplug the coax cable coming into the cable box. Coax/cable tv is notorious for causing hum as the cable installers often don’t ground it correctly.

Mine caused a very loud hum.
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post #4 of 34 Old 03-09-2020, 06:34 AM
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Try the cheater plug, like the one below:

https://www.amazon.com/GE-Polarized-...90653880&psc=1

Cheater plug is not a permanence solution but it helps you to identify the ground loop hum and work your way back to find the cause(s). Again, I would not recommend you to use the cheater plug with the power amplifier as it's dangerous for high power equipment!
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post #5 of 34 Old 03-09-2020, 09:53 AM
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^^^... Emotiva does not use the three prong (earth ground) AC socket on any of their newer amplifiers. The "cheater" is already in place.

If you are hearing noise from your speakers (hum) with nothing connected to the inputs of the amp (including the input cables themselves), you could have noise on your AC line. Dimmer switches, LED and florescent lighting and wall wart AC adapters are known to throw noise back into the AC lines.

A simple test would be to try running a heavy duty extension cord from a known "dedicated" line (your washing machine for example) and see if the noise goes away. If it does, an inexpensive solution would be an AC line noise conditioner. Emotiva, themselves, makes a great one... the CMX-2. The CMX-2 filters AC line noise, but also eliminates DC offset (which toroidal transformers, like found in the A5175, can be sensitive to). Since they are not surge suppressors and do not limit current, they are safe to use with amplifiers.

Here's a direct link to the CMX-2...

https://emotiva.com/collections/acce...products/cmx-2

If the noise persists even after trying a dedicated (or different) AC line, I would contact Emotiva for suggestions or a replacement.

Hope this helps...

Last edited by DOC1963; 03-09-2020 at 09:58 AM.
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post #6 of 34 Old 03-09-2020, 10:09 AM - Thread Starter
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Quote:
Originally Posted by Peja View Post
Quote:
Originally Posted by btbed View Post
Hello everyone, I just purchased an Emotiva BasX A5175 .. upon hookup I noticed quite an audable buzzing coming from speakers. Checked for cables... other stuff plugged in.. ect.

Finally with it plugged in by itself with just speakers only (nothing on circuit or rca cables) directly to outlet.. still buzzzz.

Anyone experienced this?
I'm retired electrician so I would first start with power supply. Anything else on the same circuit? Florescent lights? Can you easily plug into a different circuit to test? Have you got one of those cheap outlet testers to check polarity and ground? Like this? https://www.amazon.com/dp/B01EMEZ3J2...erz_origin1-20
Quote:
Originally Posted by jsc79 View Post
If you have cable tv unplug the coax cable coming into the cable box. Coax/cable tv is notorious for causing hum as the cable installers often don’️t ground it correctly.

Mine caused a very loud hum.
Quote:
Originally Posted by btran33 View Post
Try the cheater plug, like the one below:

https://www.amazon.com/GE-Polarized-...90653880&psc=1

Cheater plug is not a permanence solution but it helps you to identify the ground loop hum and work your way back to find the cause(s). Again, I would not recommend you to use the cheater plug with the power amplifier as it's dangerous for high power equipment!
Thank you for the replies guys.. this is more of a buzz than ground hum. Nothing else on line and even with dedicated line still buzz with only speakers. Like electrical buzz from transformer or something through speakers. Not even a hiss.

I've contacted Emotiva and we are going to try a replacement unit. I hope 2nd times a charm.
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post #7 of 34 Old 03-09-2020, 10:47 AM
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I'm impressed that Emotiva didn't try to have you do more tests before proceeding with an RMA.

The phrase I usually think of is "jumping through hoops". Nice that they didn't make you do that. Makes me feel good about my XPA3 Gen3 purchase.
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post #8 of 34 Old 03-09-2020, 10:50 AM - Thread Starter
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I'm impressed that Emotiva didn't try to have you do more tests before proceeding with an RMA.

The phrase I usually think of is "jumping through hoops". Nice that they didn't make you do that. Makes me feel good about my XPA3 Gen3 purchase.
Yes me too.. guy basically said sounds like you tried everything you could think of. Its definitely an electrical issue in the Amp itself. Maybe loose solder joint.. who knows. Crossing my fingers...
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post #9 of 34 Old 03-09-2020, 10:51 AM - Thread Starter
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I'm impressed that Emotiva didn't try to have you do more tests before proceeding with an RMA.

The phrase I usually think of is "jumping through hoops". Nice that they didn't make you do that. Makes me feel good about my XPA3 Gen3 purchase.
How is your XPA3?
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post #10 of 34 Old 03-09-2020, 01:00 PM
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Try to run a ground wire between your amp and processor(or receiver). Worked for me, mine was a hum.

As mentioned above rule out an ungrounded cable/sat first.

Here's my thread:
https://www.avsforum.com/forum/90-re...l-hum-amp.html

Best
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post #11 of 34 Old 03-09-2020, 05:55 PM - Thread Starter
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Originally Posted by Audioguy1 View Post
Try to run a ground wire between your amp and processor(or receiver). Worked for me, mine was a hum.

As mentioned above rule out an ungrounded cable/sat first.

Here's my thread:
https://www.avsforum.com/forum/90-re...l-hum-amp.html

Best
Yeah this is a buzz with just amp alone .. nothing else to cause ground loop. Too bad .. was looking forward to using it
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post #12 of 34 Old 03-09-2020, 08:20 PM
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How is your XPA3?
I have had no problems with it. No hum or other spurious noise. It runs cool.
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post #13 of 34 Old 03-09-2020, 11:10 PM - Thread Starter
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How is your XPA3?
I have had no problems with it. No hum or other spurious noise. It runs cool.
Glad to hear it .. I'm hoping my next one is good
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post #14 of 34 Old 03-10-2020, 12:18 PM
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Glad to hear it .. I'm hoping my next one is good
Good luck. I hope that Emotiva gets you the replacement very quickly.
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post #15 of 34 Old 03-11-2020, 08:15 PM
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Glad to hear it .. I'm hoping my next one is good

Definitely let us know what happens. If the second amp yields the same result, more sleuthing is in order. Hopefully the replacement just works though!

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post #16 of 34 Old 03-11-2020, 10:28 PM
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Yeah this is a buzz with just amp alone .. nothing else to cause ground loop. Too bad .. was looking forward to using it
I would still try his idea. It worked in my system.
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post #17 of 34 Old 03-12-2020, 10:21 AM - Thread Starter
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Glad to hear it .. I'm hoping my next one is good

Definitely let us know what happens. If the second amp yields the same result, more sleuthing is in order. Hopefully the replacement just works though! [IMG class=inlineimg]/forum/images/smilies/smile.gif[/IMG]
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Yeah this is a buzz with just amp alone .. nothing else to cause ground loop. Too bad .. was looking forward to using it
I would still try his idea. It worked in my system.

Thanks guys .. I will definitely keep you posted and try the ground trick if problem is still there with 2nd amp.
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post #18 of 34 Old 03-12-2020, 10:25 AM
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I would still try his idea. It worked in my system.
I don't get it. If the amp isn't connected to anything but the AC power and the speakers, how could there be a ground loop? With no input to the amp, the only source of a buzz would be some local EMI source. "btbed" has already determined that to be absent.

I think that the RMA was appropriate.
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post #19 of 34 Old 03-12-2020, 12:06 PM
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I don't get it. If the amp isn't connected to anything but the AC power and the speakers, how could there be a ground loop? With no input to the amp, the only source of a buzz would be some local EMI source. "btbed" has already determined that to be absent.

I think that the RMA was appropriate.

Especially since the amp does not use a 3-prong, grounded arrangement. But I'm no electrical engineer, it's internally grounded somehow, so if the neutral line in the house was screwy, couldn't that do something weird? Like I said, I'm NOT an electrical engineer....
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post #20 of 34 Old 03-12-2020, 12:23 PM - Thread Starter
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Yes I tried all that, and never had a problem with anything else on the same line. Marantz quiet as a mouse...ect.
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post #21 of 34 Old 04-02-2020, 02:33 PM - Thread Starter
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Glad to hear it .. I'm hoping my next one is good

Definitely let us know what happens. If the second amp yields the same result, more sleuthing is in order. Hopefully the replacement just works though! [IMG class=inlineimg]/forum/images/smilies/smile.gif[/IMG]
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I would still try his idea. It worked in my system.
I don't get it. If the amp isn't connected to anything but the AC power and the speakers, how could there be a ground loop? With no input to the amp, the only source of a buzz would be some local EMI source. "btbed" has already determined that to be absent.

I think that the RMA was appropriate.

So second A5175 did not work out either... I stumped the tech department and one of the designers of the amp actually.... So from here it has been returned and I am going to try a XPA3 for one last kick at the can 😁
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post #22 of 34 Old 04-02-2020, 03:39 PM
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So second A5175 did not work out either... I stumped the tech department and one of the designers of the amp actually.... So from here it has been returned and I am going to try a XPA3 for one last kick at the can 😁

Well, at least it sounds like Emotiva is trying to take care of you, so there's something to be said for that. Hey, you know what they say, 3rd time is a charm! I'll cross my fingers for you and hope it works!

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post #23 of 34 Old 04-02-2020, 05:22 PM
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So second A5175 did not work out either... I stumped the tech department and one of the designers of the amp actually.... So from here it has been returned and I am going to try a XPA3 for one last kick at the can 😁
Shoulda bought a Parasound, what do I know anyway...bought a parasound.

Plug into a different circuit, use an extension cord if you have to. Circuits can be identified by throwing breakers off and taking note of effected outlets. Some shared outlets share power with your fridge, etc.

Beware the fluorescent lighting circuits and proximity as well. You can also unplug speakers to isolate a potential problem.

If this doesn't work, tell the claims department I'll buy it from ya...I'm looking for a boat anchor anyway.

Cheers from Canada,

Stay happy, stay healthy
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post #24 of 34 Old 04-02-2020, 11:31 PM
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So second A5175 did not work out either... I stumped the tech department and one of the designers of the amp actually.... So from here it has been returned and I am going to try a XPA3 for one last kick at the can 😁
Sorry to hear that.

I guess that the support they gave must have impressed you, if you're willing to try a different amp that costs so much more than the 5175.

Maybe I've just been lucky. My maxim: it's better to be lucky than smart.
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post #25 of 34 Old 04-02-2020, 11:45 PM
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How is your XPA3?
I recently purchased an XPA-7 Gen 3 & had buzzing after trying everything like grounds & disconnecting probable devices connected to my AVR I was left scratching my head.

I happened to have a Wi-Fi smart plug near the rear of the amp & when I disconnect it the buzzing totally disappeared. I had another amp in the exact same place & never had this issue.

The plug was a good 11" away from the amp!

I have since relocated the plug & I am buzz free so I would make sure there is nothing near to the back of the amp that could cause interference.
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post #26 of 34 Old 04-03-2020, 04:27 PM - Thread Starter
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So second A5175 did not work out either... I stumped the tech department and one of the designers of the amp actually.... So from here it has been returned and I am going to try a XPA3 for one last kick at the can 😁

Well, at least it sounds like Emotiva is trying to take care of you, so there's something to be said for that. Hey, you know what they say, 3rd time is a charm! I'll cross my fingers for you and hope it works! [IMG class=inlineimg]/forum/images/smilies/redface.gif[/IMG]
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Originally Posted by btbed View Post
So second A5175 did not work out either... I stumped the tech department and one of the designers of the amp actually.... So from here it has been returned and I am going to try a XPA3 for one last kick at the can 😁
Shoulda bought a Parasound, what do I know anyway...bought a parasound.

Plug into a different circuit, use an extension cord if you have to. Circuits can be identified by throwing breakers off and taking note of effected outlets. Some shared outlets share power with your fridge, etc.

Beware the fluorescent lighting circuits and proximity as well. You can also unplug speakers to isolate a potential problem.

If this doesn't work, tell the claims department I'll buy it from ya...I'm looking for a boat anchor anyway.

Cheers from Canada,

Stay happy, stay healthy
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Quote:
Originally Posted by btbed View Post
So second A5175 did not work out either... I stumped the tech department and one of the designers of the amp actually.... So from here it has been returned and I am going to try a XPA3 for one last kick at the can 😁
Sorry to hear that.

I guess that the support they gave must have impressed you, if you're willing to try a different amp that costs so much more than the 5175.

Maybe I've just been lucky. My maxim: it's better to be lucky than smart.
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Quote:
Originally Posted by btbed View Post
How is your XPA3?
I recently purchased an XPA-7 Gen 3 & had buzzing after trying everything like grounds & disconnecting probable devices connected to my AVR I was left scratching my head.

I happened to have a Wi-Fi smart plug near the rear of the amp & when I disconnect it the buzzing totally disappeared. I had another amp in the exact same place & never had this issue.

The plug was a good 11" away from the amp!

I have since relocated the plug & I am buzz free so I would make sure there is nothing near to the back of the amp that could cause interference.

Thanks for the replies guys..

I have to commend the support at Emotiva.. we tried everything we could think of.. I even talked to one of the techs that helped design the BasX series.

I'm crossing my fingers on the XPA3 .. it is a different design so it'll have that going for it. Should have it Wednesday. It was a head scratcher for sure with the A5175. Even tried a mixing board to see if it was my Marantz sr7013. Crazy.
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Thanks for the replies guys..

I have to commend the support at Emotiva.. we tried everything we could think of.. I even talked to one of the techs that helped design the BasX series.

I'm crossing my fingers on the XPA3 .. it is a different design so it'll have that going for it. Should have it Wednesday. It was a head scratcher for sure with the A5175. Even tried a mixing board to see if it was my Marantz sr7013. Crazy.
Rule out a shorted driver by hooking up one speaker at a time. Try a different circuit as mentioned, you can even swap out cables. If all else fails, ask your neighbour to use his outlet to rule your home power being the culprit. You can run an extension cord or bring the amp to his garage. Brutal man, brutal. Maybe a bad batch of amps. Plug direct to wall, no power conditioner.

Best!
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post #28 of 34 Old 04-11-2020, 10:27 PM - Thread Starter
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Thanks for the replies guys..

I have to commend the support at Emotiva.. we tried everything we could think of.. I even talked to one of the techs that helped design the BasX series.

I'm crossing my fingers on the XPA3 .. it is a different design so it'll have that going for it. Should have it Wednesday. It was a head scratcher for sure with the A5175. Even tried a mixing board to see if it was my Marantz sr7013. Crazy.
Rule out a shorted driver by hooking up one speaker at a time. Try a different circuit as mentioned, you can even swap out cables. If all else fails, ask your neighbour to use his outlet to rule your home power being the culprit. You can run an extension cord or bring the amp to his garage. Brutal man, brutal. Maybe a bad batch of amps. Plug direct to wall, no power conditioner.

Best!
Well got the XPA 3 ... much better noise floor .. still a bit of buzz but not really heard at listening position. Definitely happier. Must be something on my end that the BasX was really sensitive to I have to guess from here.
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post #29 of 34 Old 04-11-2020, 10:45 PM
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That's odd there's still a trace of buzz w/ the xpa amp. I just received the A5175 & A300 on Saturday, no buzz or hiss coming thru my maggies, subs, or in-walls. I hope you are able to find out what's going on.

There's room for ALL of God's creatures...right next to the mashed potatoes!
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post #30 of 34 Old 04-12-2020, 09:32 AM
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Quote:
Originally Posted by btbed View Post
Well got the XPA 3 ... much better noise floor .. still a bit of buzz but not really heard at listening position. Definitely happier. Must be something on my end that the BasX was really sensitive to I have to guess from here.
Glad your good. My low level hum was definitely audible from listening positions, drove me nuts.

Stay safe, stay healthy!
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