Supernait + Denon = Loud Hum !
Posted by: Evlampi on 10 January 2009
Hello everyone, today I was setting up a sistem in my fellow`s house.
The system contains.
Supernait
Cd5x
Denon avr 3808
dvd Sony
Tv Loewe
Speakers - Monitor Audio PL300
Everything is Ok .. the sound is good,
But in cinema mode .. when I connected the supernait to the preout of Denon avr 3808 in AV Gain mode ... in order to use the PL300 as a front in the home cinema system
A Great Hum Appeared !
When the supernait is in CD source mode .. it`s Ok, but when i switch to AV it`s terrible!
Any suggestions how to remove the HUM ?
Posted on: 10 January 2009 by andy c
You have an earth loop - its possibly the TV that causes is - do a process of deduction - have just the Denon connected to the Naim 1st, then go on - I had the same issue until i used optical interconnects to my 2805, then standard chord phono's to the 252...
Posted on: 10 January 2009 by Evlampi
I`m using coaxial and hdmi to the denon and rca transparent from the denon to the supernait.
in monday i`l try the optical idea!
Thanks a lot.
So I have two days to collect different solutions
Posted on: 10 January 2009 by andy c
the hum will be caused not by the denon in isolation, but probably by the DVD player link, or tv link. My denon processes no picture at all, just audio...and I had to do it that way to eradicate aid hum. i did try ground loop isolators and all sorts...but if in any doubt ring naim up or consult your dealer?
Posted on: 10 January 2009 by fatcat
Unpugging the CD5x may help. Or Not.
Posted on: 10 January 2009 by Adam Meredith
Posted on: 11 January 2009 by fatcat
quote:
Originally posted by Adam Meredith:
quote:
Originally posted by fatcat:
Unpugging the CD5x may help. Or Not.
It may well and is the wrong thing to do.
If it does - it just confirms that you have an earth loop as a result of connecting an additional earth to the system which is at a different potential to the main system earth.
If it stops the hum, it is obviously the RIGHT thing to do.
I’ve used a Denon AVR 3803 hooked up to a Naim amp/Rotel CD player without a problem. There is no need to throw a Naim CD player into the mix.
Posted on: 11 January 2009 by Adam Meredith
quote:
Originally posted by fatcat:
If it stops the hum, it is obviously the RIGHT thing to do.
I’ve used a Denon AVR 3803 hooked up to a Naim amp/Rotel CD player without a problem. There is no need to throw a Naim CD player into the mix.
NO - given that the enquiry relates to a system with a Naim CD present the details of your system are frankly irrelevant.
The Naim part of this system wants to be earthed via the DIN connection to the CD player. Disconnecting the CD removes this designed-in connection AND makes it rather difficult to play CDs.
Within such a system it is better to apply solutions to the tagged-on AV system and identify the additional earth potential/s and isolate it/them.
Posted on: 11 January 2009 by fatcat
quote:
NO - given that the enquiry relates to a system with a Naim CD present the details of your system are frankly irrelevant.
Given that it states a Denon AVR 3803 works fine WITH a Naim amp/WITHOUT a Naim CD player it is definitely relevant. Particularly as you are suggesting a Denon AVR 3808 should not be used without a Naim Cd player
quote:
The Naim part of this system wants to be earthed via the DIN connection to the CD player. Disconnecting the CD
removes this designed-in connection AND makes it rather difficult to play CDs.
How many people watch DVD’s AND listen to CD’s at the same time.
quote:
Within such a system it is better to apply solutions to the tagged-on AV system and identify the additional earth potential/s and isolate it/them.
One of your links suggests an earth loop breaker compromises sound quality. Are you really suggesting this as a solution.
Posted on: 12 January 2009 by Evlampi
The problem is solved
The Optical cable did the job.
Thank you everyone
Posted on: 12 January 2009 by Adam Meredith
quote:
Originally posted by Evlampi:
Thank you everyone.
Funny - I don't see fatcat's contribution here.
Posted on: 12 January 2009 by fatcat
quote:
Originally posted by Adam Meredith:
quote:
Originally posted by Evlampi:
Thank you everyone.
Funny - I don't see fatcat's contribution here.
LOL
You think its funny that I didn’t manage to become aware of Evlampi’s post within TWENTY FOUR MINUTES.
Be sensible, four or five hour and you may have had a point.
It’s reassuring that on this occasion, popular and readily available AV equipment has been successfully connected to a Supernait, without the need to disconnect the Naim Cd player.
Posted on: 12 January 2009 by Adam Meredith
quote:
Originally posted by fatcat:
You think its funny that I didn’t manage to become aware of Evlampi’s post within TWENTY FOUR MINUTES.
No - I meant that it didn't seem necessary to include your 'solution' in the general thanks.
Posted on: 12 January 2009 by winkyincanada
quote:
Originally posted by fatcat:
How many people watch DVD’s AND listen to CD’s at the same time.
I do. I'd also counter by asking "Even of they don't, how many people want to be ar$ed plugging and unplugging kit when changing from one to the other?"
The optical solution seems a good one. Many criticise the sound of toslink SPDIF, but at least it does eliminate an earth path.
Posted on: 12 January 2009 by Evlampi
Hey fellows
do not fight.
The general thanks was about everyone`s desire to help - whether or not successful
And to be more specific
Adam special thanks for you ... everything is Ok now,
And if the system develop to a state when it is no way that only optic cable is going to the avr 3808 .. I`ll be forced to try the Ground Loop Isolator solution, I found several places to buy one
Thanks again and Peace!
Posted on: 13 January 2009 by fatcat
Evlampi
I have a cunning plan to get you to unplug the CD5x.
If your Sony DVD player has digital out, connect it to a digital input on the 3808. Then connect an output from the 3808 to a supernait input.
I intend to hook up a Pioneer DV717/Denon AVR 3803 at the weekend to my Naim amps. I would appreciate your thoughts on which output to use on the AVR 3803.
Tape out and Zone 2 appear to be options, with the possible use of Pure Direct
Posted on: 21 January 2009 by blythe
I cured the earth hum on a friends system by installing a seperate earth wire screwed to the case of his DVD player which I connected to the earth pin of a standard UK 3 pin plug. This was plugged into the standard wall socket and eliminated the hum immediately. (Optical cables not an option on a NAIT 5)
Posted on: 21 January 2009 by winkyincanada
OK, here's a strange one. I arrived hme this afternoon to find the power off to my building. My NAIM kit was switched on, and I didn't think to turn it off ready for when the power was restored.
The power came back on, and the kit emitted a fairly loud buzzy, scratchy, hummy noise. This independent of the volume control or input selected, although I could "mute" it. I tried turning everything (SN and HC) off and on again. No result. Still buzzing. I then unplugged my DVD player audio from the CD-in connections. Buzzing stopped. I then plugged the DVD back in - buzzing stayed stopped! Huh?
The DVD player is the only non-optical connection I use.
Anybody have an explanation?
