Another 1095 buzz story

[H.Donald]

Since adding a RMB 1095 to my system,I have had the buzz.I know that all amps give off a little something and that nothing is completely quiet.But my buzz seemed to be louder at times thereby more noticable and annoying.I have tried seperating power cables from interconnects,I use high grade,sheilded interconnects,everything is run thru a Monster 5100 and my cable box is on the side run thru a Monster 3500.The 5100,1095 and 1068 are on a dedicated line.Despite all this,last night while watching a movie the buzz was very much there during low passages.It is particular bothersome when it comes thru the surrounds. :M And I can hear it all from listening position without looking..listening for it.
Now for the good news...I had read elsewhere on this forum about grounding the 1095 to the 1068[have not been able to locate thread].
Well anyway...it worked :T.This morning I simply took a piece of 14ga.speaker wire and added some connectors,screwed them to the back of both units and prestO,changO...surrounds, NO HUM!!!center, ALMOST NO HUM!!There was a little decrease buzz in the mains...but it took away 99% from the surrounds and 75% from the center.Not truly believing...I took ground away...and there was the buzz again.I reconnected and away it went.My question is this :why so little affect on the mains??The 5 speakers are all run by the 1095...a 1070 powers the rears.I have used different screws on the 1095 housing.Some have no effect,others the same result...no effect on mains.I could live with how things are now...buzz is heard about 3 feet from mains.Whoever made suggestion on other thread...thanks :T

[PewterTA]

That's really weird, I have my 1095/1080/1098/RT1080 (plus DVD & TV & Sub) all on the same 15amp circuit that is shared with another room in the house... No buzzing at all...

I took my 1080 over to my friend's house and there was a buzzing on his system, we hooked the Comcast HD Cable through his Monster 2500 and the buzzing is completely gone, it's 100% silent (except for the little bit of hiss you get with ANY system showing there's current going through it).

It sounds like you are doing everything correctly... I would say though with you using the 1070 to power the rears, are you grounding all three pieces? You should... What you *might* want to try is getting an in-line isolator for your cable line (well try disconnecting the cable line all together and see if you get the buzzing still) that might help. If it still buzzes, disconnect the amp from everything else but the speakers and see if it still buzzes...it shouldn't, if it does, there's probably something wrong with the unit I would think.

Like I said, mine's dead quiet, actually my Yamaha Rx-v1400 made more noise than my Rotel gear I have now....

[Kevin D]

That's really weird, I have my 1095/1080/1098/RT1080 (plus DVD & TV & Sub) all on the same 15amp circuit that is shared with another room in the house... No buzzing at all...

Holy choking power Batman! I'd say get at least a 20amp circuit in there, but then again you would probably get a buzz just for the effort..

Kevin D.

[Raphie]

Which combination works best (screws wise) can you tell we which screws give the lowest hum (facing both backpanels?)

ThnX

Raphie

[H.Donald]

The lower right and side screws on the outer casing of the 1095 yeilded the best results.
On the 1068 it was unimportant.

The 1070 and the rears perform with no buzz...so I have left them alone.
As for cable...the box and line are on the other side of tv...away from the 1095/1068,also the box is plugged in its own outlet...so I don't think it's cable.

What I'm getting now is acceptable from the mains...just curious as to why buzz has been removed from center and surrounds but remains somewhat in mains.
Perhaps in the future I will go thru unplugging everything,but for now I can accept as is.

[Locutus2k]

The lower right and side screws on the outer casing of the 1095 yeilded the best results.
On the 1068 it was unimportant.

The 1070 and the rears perform with no buzz...so I have left them alone.
As for cable...the box and line are on the other side of tv...away from the 1095/1068,also the box is plugged in its own outlet...so I don't think it's cable.

What I'm getting now is acceptable from the mains...just curious as to why buzz has been removed from center and surrounds but remains somewhat in mains.
Perhaps in the future I will go thru unplugging everything,but for now I can accept as is.

Is the 1095 the only grounded component in your gear? If it is than your solution is, for now, the best. You can try a cheater plug and connect to ground the 1095 through one screw (wire in the outlet).
Otherwise, if you have others grounded components in your system, you can just use a cheater plug on the 1095 and let the "grounding safety" to the other(s) component. No buzz and the system is safe: this is called "one point grounding".
Merry Xmas,

Locutus2k

[Leef DaLucky]

Other than the cheater plug method,
i know Mitch pitched up a link to a 1095 review.
That particular reviewer experienced a grounding buzz and was able to eliminate it using some kinda Jensen grounding device.
Mitch's thread

also i believe Bing had handcrafted a similar device for his. Looks like a winner though. Probably worth investigating.

Cheers, and happy holidays,
mikey

P.S. found the link on the grounding article

[Raphie]

Took all preivous advise on this board
I think i need to take mine back for repair or swap.
disconnected all interlinks, buzz still there, isolated ground from powerplug, buzz still there. the buzz is mainly in the main & surround right speaker, i swapped the speakers buzz stayed. I think the amplifier is just defect.

[H.Donald]

Don't think I want to use a cheater plug,I am trying to live with buzz from front speakers for now ...it was really annoying when coming thru surrounds also...so at least that has stopped.Maybe ,I'll just experiment with moving ground around.Still I wonder why buzz stopped from center and surrounds and not mains?I used a 14ga. wire for gound,think if I added another it would help?Would hate to take amp back but at times the buzz sounds angry...like I don't want to be.I can live with a little...but at times I hear it from listening position.

[PewterTA]

ha ha, Kevin, I agree I am probably choking the system... But right now I have no other options.

It doesn't sound bad and the only slight flicker is when the power is kicked on to everything...otherwise nothing seems to bother it...sounds good and no buzzing!

Once I get my house, you can guarantee a nice 20amp line is going in...then I'll probably have tons of buzzing. lol

[H.Donald]

It seems the buzz turns us all into pessimists...

[H.Donald]

does anyone have an answer?

I called my dealer today and told him the latest...all he could offer was... ''that's interesting'',when I told him of my grounding the amp and processor.He had no explaination of why there is still significant buzz from mains but virtually none from center and surrounds.He had no helpful advice other than disconnect cable box,interconnects ect...blab,blab been there ,did that...I'm trying to live with it,but I'm still curious.

[Aussie Geoff]

H.Donald,

We have a had a few people where a resistor needed to be replaced in one to 5 of the input chanels of their RMB-1095 and each of those chanels has a buzz / hum that wouldn't go away...

Food for thought...

Geoff

[H.Donald]

Thanks,I don't want to even think about going in for service ...yet.Trying to peacefully co-exsist for now.

[H.Donald]

buzz story two...

A few days ago,I changed outlets and all is well.The bottom line is the 1095 did not want to be on the same line as the 1068.There is nothing but pure silence coming from all speakers.The formaly noisey mains have only the slightest buzz which can only be heard 6 inches away.
It was interesting...originally both were plugged into a Monster 5100 center which was plugged into a dedicated line.Cable box and other video equipment was plugged into another outlet.A third outlet was behind the paneling on the other side of the basement.This outlet I had never used because I assumed there were lights and whatever run on this line.Also when I plugged the 5100 in there it would always read[112-116] much lower than the dedicated line[118-120].Anyway...the only way the amp is quiet is with this third line and the 1068 into the Monster plugged into the dedicated line...go figure.
I tried all combos...the 1095 into the dedicated line and the 1068 into the third line and got noise,Monster in third line,1095 into dedicated line and got noise.The 1095 is quiet as a mouse in the third line...and that's where it will be.The 1068/Monster is on the dedicated line.I know the amp is not getting the same amount of juice...but what can I do?buy a Monster avs 2000?
All I know it sounds great and there IS NO BUZZ.I even got rid of the ground

[mitch57]

So which is it? Quiet as a mouse or only a slight buzz from the mains that can be heard 6 inches away?

[H.Donald]

To me having to be that close to hear anything means "quiet as a mouse".

[PewterTA]

Good to hear!

I've always felt that most people's buzzing was an issue with either the cable line, or the power line to the room. Just because you have a good dedicated line ran, doesn't always mean that it's a well grounded line and there isn't interference in the line.

Glad that you are in Bliss!!! ha ha

Though mine's still quiet until 1 inch away from the tweeter. ha ha.