Grounding issue...I think

PSOVLSK

I posted about this a couple of weeks ago, but I'm still having the problem and I'm desperate for help:o I just bought an Adcom 545 off of Audiogon and have it hooked up to my H/K 7300 running the front R/L. I have LSi 7's and an LSiC up front, so the reason for my purchase was to take a little strain off of the H/K. (this has ben a success, the H/K is running much cooler).

The problem?? I'm getting a "popping" sound out of my front R/L speakers when I change TV channels, change the source on my AVR, make selections from the menus on a DVD, etc. I assume this is a grounding problem, but how do I fix it? I've tried 1) plugging the amp into a different socket. 2) running a ground wire from my Monster MK3500 to the amp. (I used a strand of 14g speaker wire to do this, could that have been the reason it didn't work?)

The "popping' isn't very loud, but is obviously annoying. It's not damaging my speakers is it?

Any ideas would be greatly appreciated.

Thanks also to McLoki and referer for their responses to my previous post on this subject.

ben62670

try unplugging the cable tv wire. You may need a filter. My Adcoms are very sensative to CATV noise.
Ben

dkg999

I read a thread in another forum that was about specific HTR receivers that when you added an external amp developed this problem. I tried to find it again but was not successful in the search. I have a slight muffled thump that occurs when I switch sources on my Yamaha HTR, and it is caused by the Outlaw ICBM bass management unit I have running, and is a known side effect with that unit. It's barely noticable so I don't worry about it.

I would disconnect your cable or satellite coax and see if that stops it. If it does then it is probably related to the lack of grounding of the cable/satellite feed and you need an isolator.

PSOVLSK

Thanks guys. I unplugged my DirecTV receiver from my powercenter and the coax from the wall, but the popping is still there. Anybody have any other ides??? I'm at a loss as to what to do.

Poee7R

My 545 has been doing this also, not a loud bump moreso just a little thump when i lower the volume all the way down or change dvd's etc.

At the moment i have mine biamping my center channel, but it has done it thorugh different speakers pushing the fronts also. Ive changed cables, rerouted the cables, and tryed two other outlets. Nothing has changed and ive learned to live with it as it seems minor.

Never did do it in my 2 channel rig though, so not sure what it could be.

Dave

Systems

Sounds like the AVR is sending a little pulse of DC to the pre outs when switching.

tonyb

Try a cheater plug on the amp or the AVR,
sometimes this helps.

PSOVLSK

GV#27: I was wondering if it had something to do with the preouts. If this is the case, I guess there's no solution.

tonyb: Forgive my ignorance, but what's a cheater plug?:o

Thanks for the help.

cfrizz

Go to Radio Shack & get a plug that you will plug your 3 prong cord into & then you plug the 2 prong end into the wall, protector whatever. It did a wonderful job of taking the hum away that I had from my amp!

PSOVLSK

cfrizz: I'll have to check and see if Radio Shack has an adapter that does the opposite (my power cord has a two-prong plug). This was actually my first idea as to how to solve the problem, but I went to Home Depot and they didn't have an adapter that would convert a two-prong to a three-prong. I think I'll go to Radioshack.com right now and see if they have it. That would be great.

tonyb

Your power cord on your amp or AVR only has 2 prongs ?
Maybe up grade the power cord if that is the case.
Also make sure no bare wires are touching terminals they
shoudn't be in the rear of the avr.

PSOVLSK

tony: my amp power cord has two prongs.

I checked out radioshack.com and they don't seem to have an adapted that I need. I run across a ground loop isolator like the one I used in my car system many years ago. Never thought about using this for HT and frankly I don't know if I like the idea, but if anyone has any positive experience...I might just give it a shot.

Thanks to all for the suggestions:)

tonyb

Try changeing it out and see if it helps.Keep us posted.

PSOVLSK

Just thought I'd give an update on my problem. This may not be the best solution, but it seems to be working. I've run a RadioShack ground loop isolator from AVR to amp AND ground wire from amp to power conditioner. I haven't calibrated and honestly have only watched one movie since doing this, but I didn't notice a loss in audio quality (but then again, I'm no audiophile:D ). Anyway, hope this helps someone else who runs into the same problem. Thanks for all the suggestions.

bchivers

\\\\

TennesseeOutlaw

They are more likely to have that plug in Home Depot or Lowe's..