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Anthem MRX Receivers - 300, 500, 700 Owners Thread & Tweaking Guide - Page 137

post #4081 of 16451
Quote:
Originally Posted by Brian-HD View Post

I am using a PS Audio filter and I have no issue with hum. I did noticed some posts with Panamax filter and the MRX.

APC H10, no issues.
post #4082 of 16451
Quote:
Originally Posted by Brian-HD View Post


I am using a PS Audio filter and I have no issue with hum. I did noticed some posts with Panamax filter and the MRX.

I use a panamax and no hum. Sounds like a possible grounding loop problem if both units did it. Let Anthem know.
John
post #4083 of 16451
I have the 300 through a Panamax and have no humming issues with my first or second unit.

Must be the Panamax and the terroidal transformer not playing nice. Try plugging directly to the outlet and see what happens.
post #4084 of 16451
Quote:
Originally Posted by jayray View Post

I use a panamax and no hum. Sounds like a possible grounding loop problem if both units did it. Let Anthem know.
John

Very true and could be another component in his setup causing it when the MRX is plugged into the panamax. Read some strange ground loop issues, no fun.
post #4085 of 16451
The hum is there even when I have removed all connections ! I will try plugging direct into the wall socket later on. The unit I returned I tried plugging direct into a socket - it was not as loud, but it was there. It was also not in the cabinet and that have played a role in it not seeming so loud. (Thank-you to all who are responding. I need to decide if I should make a stand on this)
post #4086 of 16451
I just plugged in directly into a wall socket. No difference. The hum is still there. I am getting the impression that I should not be hearing this. Should I contact Anthem directly?
post #4087 of 16451
Quote:
Originally Posted by swimhike181 View Post

I just plugged in directly into a wall socket. No difference. The hum is still there. I am getting the impression that I should not be hearing this. Should I contact Anthem directly?

Yes, I would contact them and tell them you tried two units with the same results. Maybe like you have said, it could be normal but it's amplified when installed in your cabinet.

When you plugged it in at the dealer do you have to have your ear next to the receiver to here it?
post #4088 of 16451
Parrot,
Didn't think it sounded like Patrick Jayne but it sure as heck sounds like Jayne from Firefly and Serendipity. Love them both, but quite different guys. Remember when Jayne and crew landed on some obscure planet and found statues of him being worshipped? What a hoot! Anyone who has not seen F and S as well as Mentalist is surely missing some great wntertainment.
TJG
post #4089 of 16451
Quote:
Originally Posted by TJG55 View Post

Parrot,
Didn't think it sounded like Patrick Jayne but it sure as heck sounds like Jayne from Firefly and Serendipity. Love them both, but quite different guys. Remember when Jayne and crew landed on some obscure planet and found statues of him being worshipped? What a hoot! Anyone who has not seen F and S as well as Mentalist is surely missing some great wntertainment.
TJG



"Jayne!
The Man they call Jayne!
He robbed from the rich and he gave to the poor,
He stood up to the man and he gave him what for.
Our love for him now, aint hard to explain,
The hero of Canton, the man they call Jayne!
Our Jayne saw the Mudders' backs breakin'
He saw the Mudders lament
And he saw the magistrate takin'
Every dollar and leavin' five cents
So he said, "You can't do that to my people"
"You can't crush them under your heel"
Jayne strapped on his hat
And in five seconds flat
Stole everything Boss Higgins had to steal
He robbed from the rich and he gave to the poor
Stood up to the Man and he gave him what for
Our love for him now ain't hard to explain
The Hero of Canton, the man they call Jayne
Now here is what separates heroes
From common folk like you and I
The man they call Jayne
He turned 'round his plane
And let that money hit sky
He dropped it onto our houses
He dropped it into our yards
And the man call Jayne
He turned round his plane
And headed out for the stars
He robbed from the rich and he gave to the poor
Stood up to the Man and he gave him what for
Our love for him now ain't hard to explain
The Hero of Canton, the man they call Jayne!
"
post #4090 of 16451
Quote:
Originally Posted by swimhike181 View Post

I just plugged in directly into a wall socket. No difference. The hum is still there. I am getting the impression that I should not be hearing this. Should I contact Anthem directly?

The hum you are hearing, is this coming from your speakers? Does the hum get louder as you increase the volume of the receiver? Or is the hum comming directly from the receiver itself. If it is coming from the receiver, can you tell where it is coming from?

If you place your hand on the receiver and apply gentle pressure does the hum change and or can you feel any sort of vibration? Same with your cabinet, does applying gentle pressure to the back/sides/shelves/doors change the hum at all???

What is near your cabinet? Are there any large transformers? Perhaps some kind of electric equipment with a motor? Are there florescent lights near the equipment? What equipment is in the cabinet above/below the MRX?

If you are familar with what a "60 cycle hum" sounds like, does the sound you hear sound similar or is it a higher/lower in pitch? (i.e. is it similar to a florescent light with a bad ballast that hums)
post #4091 of 16451
P
Where did you get that? Thanks for all the typing. It's great!
TJG
post #4092 of 16451
Quote:
Originally Posted by jayray View Post

I think you mean GENTLE pressure
John

I missed that
post #4093 of 16451
Quote:
Originally Posted by eric-t View Post

I missed that

Yes, between my poor spelling (shamefully so really) and my quickly rushed posts during lunch… My posts do make for some of the best entertainment at times (other times they just make me want to cry)!
post #4094 of 16451
Quote:
Originally Posted by Tigger! View Post

Yes, between my poor spelling (shamefully so really) and my quickly rushed posts during lunch My posts do make for some of the best entertainment at times (other times they just make me want to cry)!

I needed a good laugh today, thanks Tigger, you are a great contributor as well as jayray and thank you both for your knowledge
post #4095 of 16451
Quote:
Originally Posted by eric-t View Post

I needed a good laugh today, thanks Tigger, you are a great contributor as well as jayray and thank you both for your knowledge

Thanks, I've learned a lot on here since I joined this forum. Just think, pretty soon you will be answering all the questions and Jayray and I can sit back and relax

Honestly, I don't know how a few of the long term members on here keep up there fantastic dedication to answering all the questions us newer members ask. But I know I sure appreciated all the help I received. If I can help out a couple of new members, all the better!
post #4096 of 16451
The sound seems to be coming from the rear left side. No change when I place a hand firmly on the unit or cabinet. I do feel a vibration. The sound is not at all in the speakers. The 700 is on the top shelf, directly below it is a dvd player. The hum is there regardless to if the dvd player is on or not.

It does sound similar to a florescent shop light. It is a low pitch hum.

The disturbing thing is that in-between songs, I can definitely hear it. (I live alone, no neighbors - and when the fridge is not running - dead quiet.)
post #4097 of 16451
Quote:
Originally Posted by swimhike181 View Post

The sound seems to be coming from the rear left side. No change when I place a hand firmly on the unit or cabinet. I do feel a vibration. The sound is not at all in the speakers. The 700 is on the top shelf, directly below it is a dvd player. The hum is there regardless to if the dvd player is on or not.

It does sound similar to a florescent shop light. It is a low pitch hum.

The disturbing thing is that in-between songs, I can definitely hear it. (I live alone, no neighbors - and when the fridge is not running - dead quiet.)

My Two Cent recommendation is.

Pick up the unit and bring it to other rooms just to see how
the House Power is.

You said it did not do it at the Dealer. This is a simple way
to try and see if something at home is doing it.

You might also MEASURE your line voltage - a big variance
can cause HUM.
post #4098 of 16451
Quote:
Originally Posted by drhankz View Post

My Two Cent recommendation is.

Pick up the unit and bring it to other rooms just to see how
the House Power is.

You said it did not do it at the Dealer. This is a simple way
to try and see if something at home is doing it.

You might also MEASURE your line voltage - a big variance
can cause HUM.

I second the above, especially trying it at least 20 feet away from your cabinet (to make sure there is not something localized to the cabinet... if it looks localized, than we can focus our attention there).

Also, make sure you try it on a different circuit (note, just a different wall outlet or even going to the next room over does not mean you are necessarily on a different circuit). Also try turning on and off things like your lights and see if any of them seem to make a difference.

How old is your house and wiring? If the outlet you are plugging the MRX in is not polarized, you can try pluging the cord in 180 degrees and see if perhaps that helps.

Also wouldn't hurt to pick up a quick outlet tester (they are like $10 I think at Home Depot). You would be surpirsed how often an outlet is miss wired. When I was looking at houses I would walk around and just plug the thing in... it was interesting to see how one outlet would be fine and another in the same house was wrong.
post #4099 of 16451
Quote:
Originally Posted by swimhike181 View Post

The sound seems to be coming from the rear left side. No change when I place a hand firmly on the unit or cabinet. I do feel a vibration. The sound is not at all in the speakers.

This is interesting, if you support the back left corner of the MRX with your hand under the MRX, do you feel the vibration? Does your hand help to deaden the vibrations and sound?

The odd thing is you state the sound went away when you were at your dealers? Is it possible your cabinet is taking a very small vibration and magnifying it into a hum like a giant sound board in a piano?

***Once you have a chance to play a bit more, I would report what you are experiencing to Anthem. It maybe something they are aware of and can recommend a fix for. At a minimum, there is a good chance your dealer received several MRXs that are all fron the same production batch and run... and that there was a specific problem with a series of MRXs (as much as we would all hate to think about this), this will help them to start tracking the issue. (I would guess your dealer took delivery of the first one you tried and the second at the same time, heck their serial numbers may even be one or two apart).***
post #4100 of 16451
Quote:
Originally Posted by sukumar View Post

I just ordered Paradigm Studio speakers (100,adp590,center 690). I am about to research this forum. I have Onkyo 708 receiver that I bought 7 months back.

Is it worth to upgrade to Anthem MRX 500?

Absolutely worth it! I had an Onkyo 705 with my studio speakers and there is no comparison! The sound that comes out of my Paradigms from the Anthem is in another league. I am a proud MRX 700 owner!
post #4101 of 16451
Quote:
Originally Posted by swimhike181 View Post

The sound seems to be coming from the rear left side. No change when I place a hand firmly on the unit or cabinet. I do feel a vibration. The sound is not at all in the speakers. The 700 is on the top shelf, directly below it is a dvd player. The hum is there regardless to if the dvd player is on or not.

It does sound similar to a florescent shop light. It is a low pitch hum.

The disturbing thing is that in-between songs, I can definitely hear it. (I live alone, no neighbors - and when the fridge is not running - dead quiet.)

Is your unit running hot? Do our MRX's have fans inside that turn on when they are running hot, and is the vibration the fan?

You are going to make me focus in on my 700, but for the most part I have not noticed any sound or vibration coming from it.
post #4102 of 16451
Alright. I have had the MRX700 on all day while I was busy (I work out of my house in a different room.) At the end of the day I settled in to watch some cycling on the TV. I noticed that in-between adds, during audio dead space - it was quiet??? I turn down the volume and - the receiver was dead quiet??? I turned it off and turned it on again. Still no humming? Nothing else had changed. I will shut down tonight and then try again tomorrow to see if it is an issue only when the unit is cold. Hopefully - the noise is gone for good - but very unsettling as to why.
post #4103 of 16451
Quote:
Originally Posted by swimhike181 View Post

Alright. I have had the MRX700 on all day while I was busy (I work out of my house in a different room.) At the end of the day I settled in to watch some cycling on the TV. I noticed that in-between adds, during audio dead space - it was quiet??? I turn down the volume and - the receiver was dead quiet??? I turned it off and turned it on again. Still no humming? Nothing else had changed. I will shut down tonight and then try again tomorrow to see if it is an issue only when the unit is cold. Hopefully - the noise is gone for good - but very unsettling as to why.

Interesting Was the vibration still present?
post #4104 of 16451
No noise, no vibration, and no clue as to what is different. All I can think of is that it could be a temperature related thing. I do keep my house cold - mid 50's today. Perhaps when the unit hits a certain temperature it resolved? It will be shut down tonight and I will see if it hum is back when I start it up tomorrow. In the mean time - very much enjoying some acoustic guitar music with no humming between songs !!!
post #4105 of 16451
Quote:
Originally Posted by swimhike181 View Post

No noise, no vibration, and no clue as to what is different. All I can think of is that it could be a temperature related thing. I do keep my house cold - mid 50's today. Perhaps when the unit hits a certain temperature it resolved? It will be shut down tonight and I will see if it hum is back when I start it up tomorrow. In the mean time - very much enjoying some acoustic guitar music with no humming between songs !!!

Congrats!?!?!?!? I think?

I've never noticed any hum from my 700, but I will say my place is never much below 65... and the dynaco driving my subs has its own hum that needs to be looked into... so if my 700 had a very quite hum, I would probably not have noticed it.

I'm hoping it is gone for you.
post #4106 of 16451
Quote:
Originally Posted by GangGreenD View Post

Is your unit running hot? Do our MRX's have fans inside that turn on when they are running hot, and is the vibration the fan?

No fan.
post #4107 of 16451
As I went to turn off the 700 last night - I noticed that the hum had returned??? I left the unit on all last night and the hum is still there. So, the question is - why did it go away for a few hours, from 5 ish until 9? It seems that it is either an intermittent fault within the unit or something environmental within my house. Later on, I will hit the circuit breaker and turn off the whole house except for the living room and see what that yields. Also, based on a suggestion, if that does change things I'll plug the 700 in to other sockets that are on a different breaker.
post #4108 of 16451
Quote:
Originally Posted by swimhike181 View Post

As I went to turn off the 700 last night - I noticed that the hum had returned??? I left the unit on all last night and the hum is still there. So, the question is - why did it go away for a few hours, from 5 ish until 9? It seems that it is either an intermittent fault within the unit or something environmental within my house. Later on, I will hit the circuit breaker and turn off the whole house except for the living room and see what that yields. Also, based on a suggestion, if that does change things I'll plug the 700 in to other sockets that are on a different breaker.

Even if the hum is still there when turning off all other circuits I would still test it on other circuits as well.
post #4109 of 16451
Well, I shut down every circuit breaker. One by one I turned them back on and checked the receiver for noise. Quiet as a church mouse. The curious thing I did find is that where as I had my electric heat removed and replaced with oil 20 years ago, there were circuits for the hot water heater, sone heating zones, and a long since gone trash compactor in an on position... I did put those on to see if I could cause the noise - it did not (and then I set them off for good.)

So, in summery. The hum was there this morning, consistently. I shut off every circuit and switched them back on, one at a time. The receiver is now dead quiet. I have turned the receiver on/off several times. The noise definitely points to a circuit breaker issue. It could be (a) one of the dead end circuits was causing an issue or (b) The circuit that the receiver is plugged into had an improper seat and needed to be reset. (This circuit breaker box is a joke, poor quality and needs to be upgraded.)

So, we will wait and see. Thank you all for your help and suggestions. This web site and all of you are awesome. I'll be back on when I am brave enough to open the ARC box with questions I am sure.

I hope that my thread did not discourage anyone from the Anthem MRX 700. My previous receiver was a HK 510 - and the difference in clarity, spacial sound, acoustic guitar reproduction and natural sounding voice is marked. The MRX 700 produces a beautiful sound!

Thanks,
-Herb
post #4110 of 16451
Quote:
Originally Posted by swimhike181 View Post

Hi, Last week I brought home a MRX700, set it up (it is in a cabinet) and was surprised at a humming noise coming out of the receiver. It is loud enough to hear sitting 10 feet away in between songs. The glass cabinet doors are even closed! I do have it plugged into a panamax power filter. I brought it back and of course, you could hardly hear it in the show room. The dealer swapped it with another one. I set that up last night and the same thing. Is this normal and I am expecting too much for wanting a receiver that makes no noise? Is that the nature of a toroidal transformer - to be loud? Would I have been better off with the 500? The rev number of the firmware is 50.02. I did search this thread and did not find similar issues so I am wondering if this is to be expected.

Thanks,
-Herb

Quote:
Originally Posted by swimhike181 View Post

Well, I shut down every circuit breaker. One by one I turned them back on and checked the receiver for noise. Quiet as a church mouse. The curious thing I did find is that where as I had my electric heat removed and replaced with oil 20 years ago, there were circuits for the hot water heater, sone heating zones, and a long since gone trash compactor in an on position... I did put those on to see if I could cause the noise - it did not (and then I set them off for good.)

So, in summery. The hum was there this morning, consistently. I shut off every circuit and switched them back on, one at a time. The receiver is now dead quiet. I have turned the receiver on/off several times. The noise definitely points to a circuit breaker issue. It could be (a) one of the dead end circuits was causing an issue or (b) The circuit that the receiver is plugged into had an improper seat and needed to be reset. (This circuit breaker box is a joke, poor quality and needs to be upgraded.)

So, we will wait and see. Thank you all for your help and suggestions. This web site and all of you are awesome. I'll be back on when I am brave enough to open the ARC box with questions I am sure.

I hope that my thread did not discourage anyone from the Anthem MRX 700. My previous receiver was a HK 510 - and the difference in clarity, spacial sound, acoustic guitar reproduction and natural sounding voice is marked. The MRX 700 produces a beautiful sound!

Thanks,
-Herb

Sounds like you are on to something and believe there is an issue with your service panel and or circuits.
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