AV2 sensitive to mains pollution!?
Posted by: Adrian F. on 13 January 2004
Hello everyone!
I recently extended my naim stereo system by adding an AV2 and NAPV175. Now I get goosebumps even with movies, not only music
But I added an annoying problem too. When use the AV2 to listen to DVD over a coax-digital cable, or the TV over standard RCA cable, I get "pop" noises induced somewhere to the front speakers. They are irregularly - but every few minutes. Sometimes they are quiet like a static click or a little scratch on vinyl, but sometimes it pop's as frightening loud that I almost fell of my couch and fear for my speakers...
The same DVD and TV where directly connected to my NAC252 before and never made problems like this. I found the light switch in this room to induce loud pop's like this when the AV2 is on (even when muted but on the av input). With the AV2 in standby and only 2 channel use over the 252 there is no problem.
Could the new AV2/NAP175 be faulty? Anything else I should check?
Thank's a lot for any experience in this area!
happy listening
Adrian
[This message was edited by Adrian Frauchiger on TUESDAY 13 January 2004 at 12:19.]
I recently extended my naim stereo system by adding an AV2 and NAPV175. Now I get goosebumps even with movies, not only music
But I added an annoying problem too. When use the AV2 to listen to DVD over a coax-digital cable, or the TV over standard RCA cable, I get "pop" noises induced somewhere to the front speakers. They are irregularly - but every few minutes. Sometimes they are quiet like a static click or a little scratch on vinyl, but sometimes it pop's as frightening loud that I almost fell of my couch and fear for my speakers...
The same DVD and TV where directly connected to my NAC252 before and never made problems like this. I found the light switch in this room to induce loud pop's like this when the AV2 is on (even when muted but on the av input). With the AV2 in standby and only 2 channel use over the 252 there is no problem.
Could the new AV2/NAP175 be faulty? Anything else I should check?
Thank's a lot for any experience in this area!
happy listening
Adrian
[This message was edited by Adrian Frauchiger on TUESDAY 13 January 2004 at 12:19.]
Hello Steve
Thank you for the idea. But every HiFi/AV equipment plugs into the same wall outlet connected via a multiple-socket mains block. I didn't change anything with the existing equipment (look at my personal profile). Just added the 2 multichannel boxes, and connected the AV sources from the 252 to the AV2. That's what leaves me a bit helpless - where does this sensitivity suddenly come from??
There is no separate spur. But I don't want to spend money in this rented flat, because I intend to move to something bigger this year. I'm perfectly happy with the sound, when the stuff woulden't "pop".
It was one additional reason to the musical quality, ect. to go the naim-route in AV too. Proper star-earthing, seamless integration, same consistent concept, ect. Hoped to save me from this kind of problems.
Don't know - probably I'm looking at the wrong places... Richard, Manu, anyone,
happy listening
Adrian
Thank you for the idea. But every HiFi/AV equipment plugs into the same wall outlet connected via a multiple-socket mains block. I didn't change anything with the existing equipment (look at my personal profile). Just added the 2 multichannel boxes, and connected the AV sources from the 252 to the AV2. That's what leaves me a bit helpless - where does this sensitivity suddenly come from??
There is no separate spur. But I don't want to spend money in this rented flat, because I intend to move to something bigger this year. I'm perfectly happy with the sound, when the stuff woulden't "pop".
It was one additional reason to the musical quality, ect. to go the naim-route in AV too. Proper star-earthing, seamless integration, same consistent concept, ect. Hoped to save me from this kind of problems.
Don't know - probably I'm looking at the wrong places... Richard, Manu, anyone,
happy listening
Adrian
Hello Manu! I guess I live 6 hours earlier here than you...
I mailed my local dealer because of the software. Most naim dealers around here are more conservative with good know-how in classical hi-end, 2channel area. The hometheatre dealers instead have knowledge about beamers, videoscalers, ect., but think with a fat receiver, over 100 connectors on the back and tiny satellites the sound-heaven is reached
The direct mode was not the solution, so the pops come from somewhere else. Because of short space, the TV/DVD/VCR is separated from the full naim rack. So I had to take a 3m long digital coax cable from DVD to AV2. Because the local naim dealers had the preferred Chord ProDac cable only at 1m on stock I took a cheaper Bandridge Profigold cable from the homecinema dealer. Since the cable runs about 2m parallel with the speaker and mains cables, could it be, that it the pops gets picked up there (bad shielding)? I pluged the cable out of the AV2 and for about 30min I had no noises, but late night it was less often anyway. So I keep on testing. Could a digital optical cable help, if this is the point where it gets the pops?
greetings from switzerland
happy listening
Adrian
I mailed my local dealer because of the software. Most naim dealers around here are more conservative with good know-how in classical hi-end, 2channel area. The hometheatre dealers instead have knowledge about beamers, videoscalers, ect., but think with a fat receiver, over 100 connectors on the back and tiny satellites the sound-heaven is reached
The direct mode was not the solution, so the pops come from somewhere else. Because of short space, the TV/DVD/VCR is separated from the full naim rack. So I had to take a 3m long digital coax cable from DVD to AV2. Because the local naim dealers had the preferred Chord ProDac cable only at 1m on stock I took a cheaper Bandridge Profigold cable from the homecinema dealer. Since the cable runs about 2m parallel with the speaker and mains cables, could it be, that it the pops gets picked up there (bad shielding)? I pluged the cable out of the AV2 and for about 30min I had no noises, but late night it was less often anyway. So I keep on testing. Could a digital optical cable help, if this is the point where it gets the pops?
greetings from switzerland
happy listening
Adrian
Derek: Your pt is answered. For the curious - it was about a former employer not hifi...
Alex: The Update is not yet made. My dealer just phoned me back. He hasn't the software, so he goes to the distributor and he probably to naim. I post back if the new software is installed, but I think it will take a few days.
The entertainment system is at home - but unfortunately I have to work now and then
There is only the analogue connection from the TV and the digital connection from the DVD player. The last thing I did yesterday night, I pluged out this digital cable from the DVD to listen to TV. No pops for the short test, but I'll test it for longer this evening when I'm back home.
For the cable - I meant it the other way round than you seem to think. I assumed that peaks on the mains cable could have induced these pops to the digital cable.
happy listening
Adrian
Alex: The Update is not yet made. My dealer just phoned me back. He hasn't the software, so he goes to the distributor and he probably to naim. I post back if the new software is installed, but I think it will take a few days.
The entertainment system is at home - but unfortunately I have to work now and then
There is only the analogue connection from the TV and the digital connection from the DVD player. The last thing I did yesterday night, I pluged out this digital cable from the DVD to listen to TV. No pops for the short test, but I'll test it for longer this evening when I'm back home.
For the cable - I meant it the other way round than you seem to think. I assumed that peaks on the mains cable could have induced these pops to the digital cable.
happy listening
Adrian
quote:
Originally posted by Manu:
Karyboue,
Je ne suis pas sûr que je comprends ce que tu veux dire au sujet du 175.
Les masses des 3 speakers sont communes et communes également avec les masses des entrées.
Emmanuel
All opinions are my own, and reflect those of the organisation i work for, even if not stipulated.
Salut,
Je te passe un lien car c'est compliqué à expliquer : http://www.hifi-cables.com/sens.html
Le problème avec le 175 est qu'avec la prise électrique dans le bon sens, la mesure sur la Din centrale donne une valeur inférieure à la Din arrière. Si j'inverse la prise, la valeur sur la Din centrale augmente et devient supérieure à celle prise sur la din arrière qui elle a baissé
.J'ai bien pensé à supprimer la terre mais je prends toute la pollution des voisin par la prise d'antenne TV collective.
L'autre solution est de n'avoir qu'un appareil connecté à la terre mais j'ai essayé et ca ne marche pas du tout.
Quand au "ronflement" du 175 à 6h du matin tous les jours ce n'est pas une blague et ce n'est pas un ronflement d'enceinte mais bien le 175. Ca dure 1/2 heure et ca donne l'impression qu'un petit bonhomme se sert de mon 175 comme salle de bain et utilise son rasoir électrique
.