rmb-1075 HISSS from speakers

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I am getting a static hiss in my 1075, As i have said previously I am not using the best cables. Howerver i am now wondering if it is not the amp it self making the hiss and not the pre or the cables.

It is somthing after reading threw the site i am pondering.

I do not belive i have a grounding issue, I am using a three prong plug and a pluging into a power cleaner.

I am notusing any coax imputs on the pre ither and mind you i never had a hiss before i started using the pre outs.

I am not the lukiest in buying hi/fi gear So with every time i get a peice i am increasingly suspect, even more when it is made in china,.

I do not have a mechanical buzz and the machine runs cold as ice,

These are klipsch speakers mind you so they are rather efficent.
The noise happens even at -99.5 db the lowest level my pre will go and you can hear this HISS sound from all 5 of my speakers, the Hiss does not increas as the volume increases as tested with a blank imput. I have had this amp for about a week now and have been running it alot, I enjoy the detail and punch it gives my system but i can not deal with this hiss issue when listening to low volume it drives me nuts.

When i unplug the pre from the amp and keep the speakers hooked up i do not hear a hiss from the amp, it is only when i have the pre hooked up and when the pre/ is putting out any sort of signal.

I am a tad worried that a simple cable swap will not solve this problem.
Ok that was a tad long winded just wanted to be sure i descibed my setup completly

I have a tivo, hdtv, cd/dvd, md, all plugged in to my pre/pre.
My pre is a yamie 2300, I am using tosslink for 3 or of 4 of the given items, all items are pluged into the same grounded power supply unit. even the antena and sat disk are double grounded threw this block. The cables running to the amp are less than 1 metter in length and are gold ended yeah they are not great but should not induce this much hiss i never had hiss issues with them in use with the yamie before when i used them to hook up a md and cd player.

I am just a nervous tekkie, I get paid to find problems and fix them before they blow up in my offices face, So yeah i am parrinoid a tad

Thanks for all the replys.

[PewterTA]

Have you tried touble shooting it. As in, have just the amp connected to the speakers, nothing connected to the amp (interconnects). Turn the amp on, it should be silent (with just an ever so slight amount of noise in the tweeters (this is normal from electricity being sent to the speaker), but should not be audible from more than an inch or two away. After you do that, and if there is little to no hiss, try connecting one interconnect and turning on both the pre/amp and see if you get hiss. Do this for all the cables until you find out what "part" is causing the hiss you have.

If you get hiss right off the bat when you have only the amp and speakers hooked up, there could be an issue with your power, try moving the amp to another circuit and see...

This is at least a starting point for you to try to figure out where the problem might lie.

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Thanks for the response.

I have tryed no internnects hooked up and the beast is dead quite. I hook up even one interconnect and it has hiss in the channel but the others stay quite.

i will try further testing this evening and update on the ideas you have posted. I will try anohter circuit however i already know i have bad power hence the huge monster power bad i had video artifacts and they are all now gone with the use of the power bar,

I am suspect of ither my pre or cables,

Any real way to test ither of those?

thanks again i know i sound like a loon, but it is what an It job will do to you

[soldonandy]

I feel your pain because I have had problems with their amps. I did however, reduce the buzz by swapping interconnects that were not shielded with shielded interconnects. Not to knock Rotel but they give you this mystic that their gear is high end but sometimes we forget that it caters to the budget "audiophile" crowd (including myself) and its made in China. I have earned the right to complain a little, I have invested hard earned cash into several Rotel pieces and although I have had some satisfaction, I have found the amps to be noisy. Hope you can solve your issue, the 1075 is about as good as it gets for $1,000 if the buzz doesn't get to you.

[DrBoom]

I used to have a 1075 and to my recollection it didn't hiss at all.
Poweramps are about the only Rotel product that (imo) don't produce hiss.
It's definately not a grounding issue because the 1075 isn't grounded, at least mine wasn't so I assume it's that way anywhere in the world.
Cables could be it, but they usually tend to pick up low frequency hum instead of high frequency hiss because of the length.
So my guess would be the pre-amp, and let's not forget the ultra sensitive Klipsch speakers.
They make any hiss problem more audible ofcourse, even though they don't produce any hiss by themselves (how could they).

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Well i am some what thinking that it is the pre/pro dew to the fact when i heard the same amp on a pair of logans it was quite as a mouse. you would think that a ton of reviews would have this mother hisses but you do not find that so it has to ither be an isolated amp issue or a pre/pro not being so hot or bad cables. I got new cables on order so time will tell i hope to get this all worked out cause for sub 1k it sounds like a champ under load and inbetween and as for the budget bit, I have heard a B&K and it was the worst sound i have every heard in my life, so it is a taste thing minus this hiss issue.

I have tryed unhooking all the interconnects and the amp goes dead quite plug in interconnects and it is dead quite
Put signal down the cable and bam you have the high frequency hisss sound from all the tweaters. it is not that loud and it is at a constant.

I mean if it is the amp them well i can always haul it back to the dealer and be like this shit does not sound what is on ur floor take it and cram it.. or get it fixed. But other than this issue i am by far please with it even for somthing twice the money they do not have the punch my klipsch would like. As for the design it fallows page with B&K and Aragon of the like so it is not a fundamental design flaw...

I am pondering this one any more imput would help gratly

[Boone38]

If you check the other threads, I had the same problem. No his when the 1068 was turned down to Min on the knob. The sec you turn it up the his starts and stays regardless of the volume.

Prior some one talked about the shielding and I would agree. I had pluged and unpluged the cables several times and even reversed the pre outs to isloate the noise. I too was using the Monster 5100. This did not help.

I then bought some better cables and the hum went away. Also make sure the ends are all the way into the jacket. hope this helps.

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so cables helped out alot I hope that solves my issue they are on order

so you are saying that right after you upgraded the cables the hiss went away that is confrotating news to hear that is for sure

[Kirby]

I had 3 1056 receivers. All had the hiss issue. Like you said on mim there is no hiss but I can sit 10 ft from my speakers and hear hiss when the volume is on 1. The his does not increase until you get to about 75 and then the noise gets very loud. I finally gave up on Rotel and went with a Denon until I can afford to buy Anthem. Rotel has a pretty good sound but the QC issues and the hiss issue should not be there in this price range. By the way if you use bypass for stereo, the hiss continues to come from the centre and the rear surround speakers.

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I am hoping a new set of cables will help the issue. also if not i am for sure going to haul this back to the dealer and be like fix it or i want my cash back my yamie was dead quite was tinny as all can be but was quite. for 1k i am not going to live with a hiss for the rest of the time i own it

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Update:
I have placed all new interconnects on.
The hiss remains however the performace of the actual sounds is far better.

I have begun to question the amp on how clean the output trannys are opperating. I am working with my dealer he was kinda stunned to hear that i have a hiss issue now ither he truly has not or like most sales in things plays dumb time will tell.
does any one know any good alternate dealers in the middle tennessee area any help would be greatly appreated. The amp once u get past the hiss sound is exactly what my speakers and ears like, however the hiss is like nails on a chalk board to me it drives me bonkers when the room is silent and i hear this noise when the amp is barly running at all.

So any more thoughts would be great help thanks

[Elvis]

If you have speakers hooked to the amp and no hiss,the amps fine,it sounds like the pre/pro is the culprit.

[ekkoville]

arrow, I would suggest trying a new pre/pro also. That seems like the only change you haven't made. Their may be something the yamaha produces that the amp is relaying. Curiously, what Klipsch model do you run?

Erik

[csuzor]

Let me confirm: RSP1068 hisses.
When on mute, nothing (maybe mute shorts each output, the RMB1075 sees nothing).
Any other volume setting, either digital coax or analog or external inputs (all with no music) or unconnected input, all cause some hiss from the tweaters of all channels, and from 50+ volume setting also from midranges.
What's just as bad, crosstalk: when a source which is not playing is selected, at 40+ volume setting another analog source can be heard.
Of course, all of this with my ears very close to the speaker, but it does become perceptible at several meters at 70+ volume settings.

I have pro quality OCC pre->amp connects, other interconnects are average but will not change any of these results (hiss also from non-connected inputs).
I have an APC UPS connected for all the power supplies, which effectively filters the line from noise.

Does this mean I will enjoy the RSP1068 less now? probably not. But I will turn other inputs off to avoid crosstalk, and I will use mute when no source is playing (or standby, but never off).

Christophe

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I am running Rf-3 all around and a rc-3 center Klipsch. I will try another pre/pro when i get a chance i know it is only thing i have not tryed dew to lack of funds and avalabilty.