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Sound Distortion HELP!!

matthewcoupe

New member
May 20, 2012
4
0
0
Hi Guys,

I have hit a serious wall and dont know what to do.... I have the following set up:

ONKYO Nr 717 Av reciever

Connected via pre out

Audiolab - 8200 DQ & Audiolab 8200 P which is used to power my fronts but also my audio hifi. These are connected Monitor Audio BX5's which are biwired.

I currently have a massive issue with a hhhmm distortion coming through. The distortion is running through the whole system but seems to originate when I connect the audio lab to the AV stuff through the Pre-out.

I also seem to be having problems with my Sonos system that is connected to Audio I dont know whether that is related or just network issues.

So far I have done the following:

Made sure I seperate the speaker wire from power supplies

All connections are top quality inter-connects

I have got specialists power blocks to remove distortion on that side

I am not the most technologically advanced so there may be something completely stupid that I am doing. Any help would be greatly appreciated as it is soo annouying and I really want to sort it out..

Thanks
 

John Duncan

Well-known member
Jan 8, 2008
2,027
13
19,695
Does the audiolab have a fixed gain input for AV purposes or do you set the volume to 12 o'clock or similar?

Also, is there a bluray player connected via hdmi in all of this?
 

matthewcoupe

New member
May 20, 2012
4
0
0
The Audiolab does have fixed gain input, and it is switch on.

There is not blueray player. Just tthe following:

Vrigin media box - connect to Onkyo

Sonos Player - Connected to Audio lab

Boxee - Connected to Onkyo
 

richardw42

New member
May 2, 2010
299
0
0
What is it about the Sonos that disappoints ? Is it connected via optical.

Re your RCA (analogue) cables. Have you tried different s sets ?

I bought a pair of shielded cables from eBay for less than a fiver. They Go between a Yamaha AVR and Active speakers
 

John Duncan

Well-known member
Jan 8, 2008
2,027
13
19,695
The problem is there when there's nothing playing, right? Feels to me like you have one of two problems - a ground loop or a gain mismatch between your AV receiver and amp, or you have a ground loop.

You can try to eliminate the first by NOT using the fixed level AV input, but putting it into a variable level input, setting the volume to 12 o'clock, and rerunning calibration on the receiver. If the problem is better or worse, try the volume at 9 o'clock or 3 o'clock (for example) and recalinrate again, to see if the problem can be resolved.

If that doesn't work, you should try a ground loop isolator which can be had for a few quid on eBay.
 

arrabon

New member
Mar 27, 2013
2
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0
Had you previously performed any Audyssey calibration with the Onkyo before connecting the Audiolab? In the Onkyo settings, try checking the levels for your front speakers and reducing them if they're boosted or just recalibrate the receiver with the Audiolab set to fixed gain.

Does it happen with a particular source, or just all the time?

What's the problem with the Sonos? The sonos also has variable and fixed volume options in the settings too.
 

matthewcoupe

New member
May 20, 2012
4
0
0
Right

Thanks everyone for the advice so far, unfortunately I can only say soo far...

I have done the following:

Plugged Amps into the same power block

Reperfomed the Oddysey callobration

put in a Loop isolater

also reduced the length of my cable cable

I have not turned off the fixed gain yet, as I am not sure how I should approach this, should I turn down the gain so the hhmm dispears then up the input form the amp, or is it just a test to see if the hhmm doesnt apper

Interestingly enough though when conforming the callobration test there was no hhmm what so ever..

Any other ideas?
 

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