ground loop problem

over50

I`m trying to fix a ground loop. I`m getting a humming from my psw505 coming from onkyo606. Need help, how do you attach a ground loop isolator when all the connections are HDMI. I have search and all i see are rca and cable hook ups. I have installed a isolator on the cable, didn't fix the humming.Any ideas will be helpful.

disneyjoe7

I'm confused, the subwoofer is connect with a rca cable, and not a HDMI cable right?

Also could you put the subwoofer to the same outlet with the onkyo avr, that could help.

over50

The sub has a single cable connected to lfe, the ground loops i see for sale have rca red&white cables.i`m going to undo all the cords make sure no power cords are with speaker wire ect. i`m also going to unplug all the banana plugs check for any loose wires . i don`t know if i wasted my money, i bought a ground loop ,Hum X .it plugs into the electrical socket. I`v also look at the internet ,some owners on the sr606 claim that hum noise thorough speakers when connected by hdmi is a 606 problem. solution is replace a resister. if the serial # is marked with a B at the end, its already been done. what gets me is the hum isn`t all the time, its random and only can notice when there is no audio.

george daniel

do you have CATV connected anywhere in the system?

jinjuku

Pick up a hum eliminator they range from ones at Rat Shack for ~$15 to something like the Samson S-Convert/ART Cleanbox for ~$50-60.

Or as suggested plug the subs power into the same outlet as the AVR.

Face

You can run a ground cord from the chassis of the plate amp to the chassis of your receiver. If possible, plug everything into the same outlet/line. If your cable tv is causing it, check out the Cable TV RF Isolator on this page: http://www.jensen-transformers.com/iso_vid.html I run one before my HD box and cable modem and it didn't cause any loss in performance.

FYI, I don't believe a HDMI ground loop isolator exists, yet. Last time I contacted Jensen transformers about one, they said it may not even be possible to make one that would be trouble free.

AudioGenics

how did you determine it was a ground loop ?

do you have your components installed and connected correctly ?

over50

I separated the cords so that power,speaker wire, hdmi are not tie together, seem to help. I`m not positive that's its a ground loop.it could be something else interfering. i am positive the hum/buzz is coming from the 505.Thanks for the ideas/keep them coming.Thanks

disneyjoe7

Are the sub and the AVR connected to the same outlet?

disneyjoe7

Another thought it could be a bad sub cable, is there another cable you could try?

over50

i just bought a new sub cable from monoprice, same result. Onkyo advise me to reset the AVR to original settings. I`m waiting till after i install Hum X on tuesday . This weekend i will retie all the cables, and make sure power,speaker,hdmi are all kept separate. its frustrating because i`m running out of ideas and i still get a hum from 505.

Face

Since you're ignoring the question, I would guess the answer is no. Either run a longer power cord from the sub to the same outlet as the receiver, or run a small gauge wire from the plate amp chassis to the receiver's chassis.

disneyjoe7

Or he could move the sub to test so the cord could be the same outlet, I assume it's not the same outlet.

over50

I have a Tripp Model: ISOBAR6DBS surge protector, all my devices are hook to the Tripp including the comcast cable.

disneyjoe7

Ok so next have you disconnected the cable from this surge protector to see if this is the problem?


Also those this sub give you the hum noise without the cable connected to the sub?



Steve

disneyjoe7

Cable as in comcast cable not to confuse you. Hums are ground loop which can come from many sources trying to eliminate possible problems one at a time to help you out.

kevhed72

One weird thing to check...if your up for it.....see if the metallic shielding - the 2nd layer of weaved string metal fibers of the cables - is in contact with the connector. The theory is that this metal shielding can generate a ground loop from outside the house, since many cable TV feeds are not properly grounded either outside the house, or at the source. If you can cut back all this shielding and replace the cable into the connector so it (the metallic shielding) do NOT touch the connector to your CTV box, this may help. I actually did this and it helped...now I need my first cup of coffee.

george daniel

hell,,I'm confused-- the only ground loop issues I've ever experienced were when I had my CATV connected and the component (CATV receiver) was connected to the pre amp--hummmm,, then I just simply disconnected the cable(CATV) and then hum was gone,,,simple fix was a jensen isolator that simply goes inline with the cable--no more hum,,, with that said,,and I may be way off base,,have you tried disconnecting the CATV co-ax cable?

BorisBoris

I'm facing a similar issue.. I have a small Logitech Z-5500 setup for my PC and recently the sub started making a hum/popping sound every few minutes, sometimes every few seconds. It's not a constant sound but more of a "hummmb" or "bumpgp" sound...

I've tried different outlets, can't try a different cable since it's built into the sub, would replacing the fuse help solve this problem? Any other ideas?

Sorry to hijack, but didn't want to start a different thread for a similar topic.

Thanks

disneyjoe7

BorisBoris,

May need to reset your AVR, or cable to sub is bad, and or something in the house is given you noise over the ac line. Hairdryer or ceiling fan controllers, something along those lines.

over50

Yes, I have disconnected the cable and same results. I still get the hum. That`s why i`m thinking its the onkyo606. I did email Onkyo, they advise me to do a receiver reset to its original factory settings. That`s my last resort. I will then have to set all the settings again. But i`m running out of ideas. Today i`m going to separate all the cables,so all power,speaker,hdmi are all separate from each other. I have thought about having an electrian run a new line just for my home theater system .

disneyjoe7

disneyjoe7 wrote: »

Ok so next have you disconnected the cable from this surge protector to see if this is the problem?


Ok check.


Also does this sub give you the hum noise without the cable connected to the sub?


Did you do this?

over50

I did disconnect the cable from my surge protector, no change . Still had the same hum. I did pull the cable connected to the sub, when i did this the noise stop .

disneyjoe7

Ok do you have pre amp outputs on that avr? If so put the sub to a L or R output to see if it still hums.

BTW is the volume controller all the "Up" on the sub?

over50

No pre amp. i have a single pre out from avr to sub. the volume is at noon.

disneyjoe7

Any update on your side?

If you still have a problem, have you tried a cheater plug on the sub ac plug?



http://www.summitsource.com/popup_image.php?pID=8800&image=0&osCsid=mth1ooh0tp19ijivn7gckema93

BorisBoris

disneyjoe7 wrote: »

BorisBoris,

May need to reset your AVR, or cable to sub is bad, and or something in the house is given you noise over the ac line. Hairdryer or ceiling fan controllers, something along those lines.

Tried reseting, unplugging, turning on and off the Logitech AVR time and time again with no luck.. it started recently (last month or so) when I've had it in mostly the same room since ownership for the last few years without this problem, how would I go about replacing a built in sub cable?

[Deleted User]

disneyjoe7 wrote: »

Any update on your side?

If you still have a problem, have you tried a cheater plug on the sub ac plug?

You would use the existing cord. What this plug does is lifts the ground pin thus converting a 3 pin plug to a 2 pin plug. :cool:

jinjuku

over50 wrote: »

I did disconnect the cable from my surge protector, no change . Still had the same hum. I did pull the cable connected to the sub, when i did this the noise stop .

Go to radio shack, pick up a $16 hum eliminator and try it out.

They even have *gasp* a return policy. You get all your $$ back if you don't like it.

TrashyTrucker

nap wrote: »

disneyjoe7 wrote: »

Any update on your side?

If you still have a problem, have you tried a cheater plug on the sub ac plug?

You would use the existing cord. What this plug does is lifts the ground pin thus converting a 3 pin plug to a 2 pin plug. :cool:

Don't mean to hijack this thread but...
I used these cheater plugs to stop the ground loop interference in my system. My two amps are both on the cheater plugs to stop this hum.

Tell me I didnt waste hundreds and hundreds of dollars on AQ PC's and AQ king cobra IC's to have to rely on a cheap 2 dollar part? :mad:

I am using the Panamax 5100 to condition the incoming ac. I have ea. amp powered by AQ pc's. BUT! on my source/avr (pre) I am also using a AQ pc that is 3 prong too, but the avr has only a 2 prong input.

Q: perhaps on the pre I should roll the AQ pc with the stock pc to see if that works? Just thought of that while typing.

But those dang cheater's work now :mad:

thanks for reading,
Matt :biggrin:

disneyjoe7

If using a power conditioner I would roll some equipment plugs to help with hum. I use a Monster 5100 which uses an isolation transformers to isolated ac outlets, I assume to reduce any hum / noise problems.