Hum from RB-1080 without cable TV or Satellite

[audiofan]

Hi
I know that the "hum" thing has been asked many time in the forum. However, most question related to the interference of cable TV or Satellite Dish.

Here is my situation: I don't have any cable tv or satellite dish connected in the system. Whenever i turn power on 1080, there is buzzing sound coming from the tweeter. Not too loud to recognize, but it's there.

Do you know the good way to eliminate this? Cheater plug is not an option due to safety issue, but it works because i have tried. Right now i plug 1080 directly to the wall. I'm not sure Monster power conditioner will help ....


thanks a lot.

[will1066]

I am also afflicted with this. I think the culprit is mains noise (or audio cables picking up junk from nearby power cables), but I haven't had the time to test my guess.

[audiofan]

I forgot to mention that i have track light with dimmer. Some has mentioned in this forum that dimmer may cause the problem too. I have tried to turn off the light , but the hum is still there. My interconnect is from CobaltCable.com . But my speaker wire is Soundking from partsexpress.com . Not sure which one causes the problem

[Aussie Geoff]

Audiofan,

I was getting this and I used a high quality mains filter that filtered active, nuetral and ground and the problem went away...

We have 240V in Aussie so that the ones I used (and lots of others) wont work in the USA... But I'm sure you will find one there...

Geoff

[GRCRYSTYK]

Aussie Geoff,..
Do you have a link to this product? This sounds like sort of a whole house power filter. Is that right,....Where does it go in the system? Outside on the meter, or inside the home?

Thanks >>>--->

[Aussie Geoff]

Hi,

Here's a LINK to a thread covering it

Geoff

[ds22030]

I just got the 1080 about a month ago and had the quiet buzzz. I took a 14 guage wire, put U clips at the end, unscrewed a screw on the body/housing of my AVR and the 1080, and tightened the screws to establish a common ground. Total cost was about $2 or less. Absolute silence.

[will1066]

Can I accomplish the same thing by unwinding a metal-wire coat hanger, cutting out a small segment, bending small hooks on both ends, and fastening it between my pre/pro and the 1080?

[ht_addict]

Hi
I know that the "hum" thing has been asked many time in the forum. However, most question related to the interference of cable TV or Satellite Dish.

Here is my situation: I don't have any cable tv or satellite dish connected in the system. Whenever i turn power on 1080, there is buzzing sound coming from the tweeter. Not too loud to recognize, but it's there.

Do you know the good way to eliminate this? Cheater plug is not an option due to safety issue, but it works because i have tried. Right now i plug 1080 directly to the wall. I'm not sure Monster power conditioner will help ....


thanks a lot.

Do you only hear the hum with your ear next too the tweeter or at what distance? If you use a digital coax to hook your dvd to receiver/prepro then try an optical and see what happens.

ht_addict

[mitch57]

ht_addict,

I tried that with my 1095 but it had no effect. I disconnected my DVD coax and used optical. I also tried disconnecting the SAT cable from the wall and the SAT box. None of these worked for me.

I still have a very, very slight hum/buzz when I put my ear right up to the tweeter. Increasing the volume with no source does not change the volume of the hum/buzz. I don't really want to spend a bunch of money to silence a hum/buzz that I can't here from my listening position or even when I am standing right in front of the speaker.

Does anyone have any other cheap ideas to try?

[audiofan]

ht_addict, I can only hear it if i put my ear next to the tweeter and I can't hear a thing from my listening position. i do have coax digital, but i don't have optical digital cable. I think i will borrow one from my friend to try it out.


ds22030, I am no expert on this, but i was wondering whether it is unsafe as the case of using cheater plug? Your idea is great, by the way.

[ds22030]

Guys, I got my idea from this board!!! Dont remember who posted it but the credit goes to that guy....Thanks Guy!

Although a wire hanger will work, its thick. Just get an interconnect and contact the ends to fasteners on the housing of the pre/pro and the amp and see if you hear the buzz go down to make sure it works. Try a couple different fasteners on the housings as I found that some just reduce the buzz while others completely ELIMINATE it. My speakers are dead silent....absolultely no buzz. Just get a couple small connectors, crimp it to the wires and connect the two housings. You really dont even need the connectors but it makes install and removal easier.
As to the safety, admittedly, I am not sure but I dont quite see how a common ground is going to hurt.

Good luck.

[will1066]

True, the coathanger wire is thick. I'll look for some high-gauge wire and try it, thanks.

[PewterTA]

Would it make sense at all to remove one of the screws on the back (just back it out a little), attach a piece of wire (with a connector) to it, tighten it down, and attach the other end to the phono ground?

Just curious if that would be an easy option for grounding the case!?

[ds22030]

Actually Pewter, now that I remember, I attached one end to my antenna loop ground for my AVR. Worked fine.

[Andrew Pratt]

I still have a very, very slight hum/buzz when I put my ear right up to the tweeter.

If you have to put your ear within a foot of the tweeter its normal background noise and nothing to worry about. If you can hear it from the listening sopt several meters away then its obviously something you'd want to remedy.

[hired goon]

G'day,

I was getting this and I used a high quality mains filter that filtered active, nuetral and ground and the problem went away...

I've got the same mains filter, and I'm still getting a buzz from my 1095. Disconnected cables and power cords for all other components -- still got the buzz.

Guess I'll have to try this earthing trick...

--Geoff

[will1066]

I tried with a regular single-ended interconnect, placed one end on the 1080 and the other end on my pre/pro and it reduced the noise significantly (not completely). Will need to rig up a wire. I have some spare interconnect wire that's thin enough but it has no connectors. If I just strip the jacket on the ends and attach bare wire to the screws on the pre/pro and amp, will that be okay?

[audiofan]

I tried the same way ds22030 suggested last night and it worked great. Noise is reduced 98% . I can only hear it if i put my ear close to tweeter and pay close attention to the buzz. So I'm happy. Basically, i use a spare speaker wire, strip off both end and use connector i bought from Home Depot. THen i connect one end to the receiver screw and one end to 1080 screw.

I'm no expert on the electronic, but after doing this , i think sound is much better or it's just my imagination...

[ds22030]

good to hear its working out. Will1066, make sure you try different screws at different locations as it will make a difference. Audiofan, technically, it should sound better since there is no noise floor....but I seriously doubt you would hear it when listening to music

[will1066]

Thanks, ds. Bare wire on the screws is OK?

[ds22030]

Will, bare wire at the very ends of an insulated wire should work fine. Totally bare wire would not be advisable tho as it could short something..

[will1066]

Gotcha. I will report back. Thanks.