Xpr5 very slight hum in surrounds only

[Deleted]

Front speakers are dead silent. Back left and right have a slight hum

Any thoughts to why? Or a way to fix

Edit. Doesn't matter which channel I plug hem into. They still have the gym. And only the surrounds

[Deleted]

Yeah. Thanks for the reply

However all my speakers are exactly the same. So "smaller" more hum doesn't help here

Just don't want to drive myself nuts trying to fix it if it's just the wiring

[sonicseeker]

Mar 29, 2015 12:40:52 GMT -5 @bmoney said:

Front speakers are dead silent. Back left and right have a slight hum

Any thoughts to why? Or a way to fix

Edit. Doesn't matter which channel I plug hem into. They still have the gym. And only the surrounds

You may have already done these things but,
Are you using the same wire type to all speakers.
Can you get access to the wire or are they in wall.
Did you move one of the speakers to a different position like a front to see if it follows the speaker.
Do you have any spare wire to run a temp. to the speaker or speakers.
You say you moved the outputs to a different channel and they still do this?

[Deleted]

Well I am finishing up construction of my new Ht and the wires are now buried in wall

Al the outputs in the amp make the slight him but only to the surrounds. I'm very Curious where the contamination is coming from. Has to be in the wire runs.

It's not terrible. I am going to try direct from the avr see if that matters then I'll know it's the wire run

[Deleted]

Confirmed its the xpr5

For some reason to those speakers it sends a hum

[creimes]

How close to the elctrical wiring or lights are the speaker wires ?

[Deleted]

Within a couple feet.

I thought if that too. But why does it go away with avr amp?

[bootman]

Mar 29, 2015 15:11:13 GMT -5 @bmoney said:

Confirmed its the xpr5

For some reason to those speakers it sends a hum

Are you sure the hum isn't coming from the preouts?

Just for grins wire the surrounds outs to the fronts and see if the hum follows.

[creimes]

Not sure, seems odd, does the XPR-5 exhibit the hum when you move one of the LCR speakers to that binding post/channel

[deltadube]

did you try switching up the mains to the back and vice versa..

see if the mains hum..

I had a slight hum last summer after moving my rack around a bit..

was just the way the cables where crossing .. and it stopped..

cheers

[Deleted]

Let me try it out and I'll report back

[Deleted]

im stumped.

When switching the same out out to output to the front speakers. Hum is there

Tried different rca cable. Nothing.

Maybe it's the preout on the avr??

[Gary Cook]

Trouble shooting 101, there are 5 pieces of hardware involved;
1. Speakers
2. Speaker cables
3. Power Amp
4. Interconnects
5. Processor/AVR

What we are looking to do is isolate the source, hopefully it's only one source, but it can be a combination.

So the first job is to swap only #1, which it seems you have already done. So it's not the speakers themselves.
Next swap #2 only.
Then #3 only.
Then #4.
And lastly #5.

My guess, and it's only a guess, is that commonly with the longer speaker wire run interference has more chance to make its way into the wiring. Especially in wall wiring with power cables in proximity which manifests itself as hum (not hiss or buzz).

Cheers
Gary

[Deleted]

Only ones I havent/can't do is 2 and 5

So I guess I have narrowed it down. Thanks!

[vcautokid]

Are switches in correct position for balanced, or single ended? Just a thought. Also with the amp off cycle the switches to he sure the correct input type selected.

[Deleted]

Is it possibly a dimmer switch related problem.  if any dimmer switches on same line turn off and see if you can still hear hum

[bootman]

Mar 29, 2015 16:40:39 GMT -5 @bmoney said:

im stumped.

When switching the same out out to output to the front speakers. Hum is there

Tried different rca cable. Nothing.

Maybe it's the preout on the avr??

I think you found it.

[USNRet]

Hum is always a introduction of 60 hz noise from the power. Hiss on the other hand is completely different. I see you have Klipsch; yours are not as sensitive as my Belles but high gain amps do not play well with efficient speakers. I had to ditch the Emo XPA-1s as the floor noise was too high but again you stated HUM not floor noise / hiss.

Where it (60 hz hum) is being fed into your system is the question. Power up the amp with nothing connected to it except the speakers (and power, DUH). Is the hum there?

If still there connect another speaker to the humming output of the amp. If the hum now goes to the previously silent speaker you have an amp issue. If the hum is not present in the previously silent speaker you have a speaker wire issue. In the later case run a new wire across the floor to the surround and check the channel / speaker.

Report results.

[Deleted]

Mar 29, 2015 18:43:47 GMT -5 signaltransduction said:

Is it possibly a dimmer switch related problem.  if any dimmer switches on same line turn off and see if you can still hear hum

Funny enough that's not the issue. And I'll tel you why I know

For some reason today the dimmer started tripping the amps protection. Every time I would fade up or down it would trip it

I then took the amp and put it on a completely different circuit by running an extension cord.

Now it doesn't trip. But the slight hummus still there

Again it is very faint. But loud enough to hear when silent. Also it doesn't get louder when turning up volume.

The hum does jump to other speakers when they are put in the surround outputs of the amp.

Like I said I think I have found the issue. It's the preout on the avr.

Because when it is not connected to the amp either on amp side or avr side. The gym goes away

Guess there isn't much I can do about that

Come to think of it. I never had my surrounds hooked to the amp. Because he way ATMOS and amp assign is setup. I had to run LCR and front top L/R from the xpr. And surrounds and Top rear R/L from the avr. This is the first time using he surround preouts from this avr!

[tommy89]

If you have a ground loop hum it will not come from all your speakers 
you are probably getting interference somewhere. It will not come out of all your speakers.