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  1. #1

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    Default Buzzing sound from Rotel 1095 amplifier

    I just bought a Rotel 1095 power amp from ebay. It gives a buzzing sound even if the CD player is not playing. Listed below is the trouble shooting I have done so far.

    1. Turn off the entire stereo system, only the 1095 is on - I can still hear buzzing sound coming from the speakers.
    2. Changed the RCA interconnects from the pre amp to the 1095 - I can still hear buzzing sound coming from the speakers.
    3. Disconnected the RCA interconnect. I still hear a Buzzing sound.
    4. Connected a dedicated speaker cable from the 1095 to the speaker to ensure no ground loops. I can still hear a buzzing sound.
    5. Connected to a different outlet - I can still hear a buzzing sound.
    6. Use a monster cable power filter (HTS1600) - I can still hear a buzzing sound.
    7. If I disconnect the speaker cable . The buzzing sound goes away
    8. Used another power amplifier. There is no buzzing sound.

    I have a feeling, it is the 1095 that is the problem.

    I'll appreciate comments.

    Thanks in advance....

  2. #2

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    If the amp is on with nothing connected,and there is no buzzing,then chances are it is not the amp.ground loop buzz can come from various places within your system.Try a cheapo 2 buck cheater plug on the amp.Some gear is just more sensitive to ground loops.

  3. #3

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    Yes, there is buzzing even if there is nothing connected. I have a 1080 which is driving my fronts. If I really press my ear to the speakers I can hear a little buzzing sound. But the 1095 the buzzing sound is a bit loader.

    Tony, you mentionedf a cheapo 2 buck cheater plug. What is this plug, can you tell what it is and I will buy one. I run to walmart if I can get it there?

    Thanks in advance

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    Any Home Depot,hardware store,it's a plug that connects to the plug on the power cord to your amp and makes the 3 prongs into 2 prongs,essentially doing away with the ground.Not to worry though,the amp will still be grounded by way of the I/C's.For the 2 bucks,it's worth a shot.

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    I thought you said when you removed the speaker cables,the buzzing stopped?

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    Ok I understand. Maybe I can also try a Rodioshack noise suppressor?
    Thanks

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    My man,this is important,with the amp on,and nothing connected to it,can you hear buzzing from the amp itself? If so,then you have a problem with the amp and would not recommend lifting the ground at that stage of the game.If no buzzing is comming from the amp itself,then your good to go,try a cheater plug.Got it?

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    How loud is the buzzing? And i'm thinking that if you remove the speaker cables it's obviously not going to buzz, since the amp is no longer connected to the speakers. If there's nothing else connected to the amp except the speakers and you're getting a loud buzz, i'm thinking there's something wrong with the amp.
    Speakers: Polk LSi15
    Pre: Adcom GFP-750 with HT Bypass
    Amp: Pass Labs X-150
    CD/DVD Player: Classe CDP-10
    Interconnects: MIT Shortgun S3 Pro XLR
    Speaker cables: MIT MH-750 bi-wire
    TT:Micro Seiki DD-35
    Cartridge:Denon DL-160
    Phono Pre:PS Audio GCPH

  9. #9

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    Yes, the buzzing stops if I remove the speaker cables.

    I had an extra power cord. I removed the ground terminal with a pair of pliers. To my surprise the buzzing was minimized , even though there is still a buzzing but it is now very low!

    Thanks a million for the advise.

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    Quote Originally Posted by Tomasito View Post
    Yes, the buzzing stops if I remove the speaker cables.

    I had an extra power cord. I removed the ground terminal with a pair of pliers. To my surprise the buzzing was minimized , even though there is still a buzzing but it is now very low!

    Thanks a million for the advise.
    Did you finally find the 1095 in silver? How much did you pay?

    7.2 Set Up
    Onkyo 805
    X-Box
    3DO
    PS3
    Velodyne DPS10 sub
    Polk Audio 2- RTI 12's
    Polk Audio CSI 5
    Polk Audio 4- FXI 5's
    Pronto 7500 LCD remote
    Gefen HD video 1080p scaler
    Mitsubishi TV 73927 1080p

    Future purchase Rotel RMB 1095 200x5 THX

  11. #11

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    I was able to win the ebay auction for $1,050 + shipping of $85. It still carries the factory warranty.

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    Where do you live that they charged $85 shipping? Talk about being raped.

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    did you contact the seller about the buzzing problem? if so, what did he say? try one of them $1.50 three prong cheater wall plugs.. that some times may help with a buzz or humm problem.

    do you have a ceiling fan in that room by chance or florescent lighting? both of those can introduce sound problems. lastly.... there may be something going bad on the inside of the amp.

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    Quote Originally Posted by dorokusai View Post
    Where do you live that they charged $85 shipping? Talk about being raped.
    and this is helping him to solve his problem how ?? ;)

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    Quote Originally Posted by Tomasito View Post
    I was able to win the ebay auction for $1,050 + shipping of $85. It still carries the factory warranty.
    Great find, congrats on the new buy, hope you solve the buzz.

    7.2 Set Up
    Onkyo 805
    X-Box
    3DO
    PS3
    Velodyne DPS10 sub
    Polk Audio 2- RTI 12's
    Polk Audio CSI 5
    Polk Audio 4- FXI 5's
    Pronto 7500 LCD remote
    Gefen HD video 1080p scaler
    Mitsubishi TV 73927 1080p

    Future purchase Rotel RMB 1095 200x5 THX

  16. #16

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    Quote Originally Posted by danger boy View Post
    and this is helping him to solve his problem how ?? ;)
    I misread and thought he bought another amplifier while still having a problem.

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    Quote Originally Posted by Tomasito View Post
    Yes, there is buzzing even if there is nothing connected. I have a 1080 which is driving my fronts. If I really press my ear to the speakers I can hear a little buzzing sound. But the 1095 the buzzing sound is a bit loader.

    Tony, you mentionedf a cheapo 2 buck cheater plug. What is this plug, can you tell what it is and I will buy one. I run to walmart if I can get it there?

    Thanks in advance
    Hi Tomasito,

    I also purchased a RB-991 second hand on eBay Oz and had exact same issues. Tried everything you did but to no avail. I ended up taking it to an authorised Rotel repairer here in Oz and the amp did have an internal issue (my amp was out of warranty). It cost me $220 AUD to repair, but is whisper quiet since the repairs.

    I note you said it is still under warranty,that being the case, I would return it to Rotel / an authorised repairer to have it fixed while still under warranty - you have nothing to lose.
    Regards - Gaz from the land of Oz

    Main
    Denon AVR-4520
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  18. #18

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    Hello Gaz,
    I was able to minimize the buzzing sound by using the 3 prong to 2 prong socket adapter. There is still a buzzing sound, but I have to press my ear to the speaker to hear it.

    Gaz,
    Did Rotel tell you what was the cause of the buzzing sound?

    I do plan to get the amp check by Rotel.

  19. #19

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    Quote Originally Posted by Tomasito View Post
    Hello Gaz,
    I was able to minimize the buzzing sound by using the 3 prong to 2 prong socket adapter. There is still a buzzing sound, but I have to press my ear to the speaker to hear it.

    Gaz,
    Did Rotel tell you what was the cause of the buzzing sound?

    I do plan to get the amp check by Rotel.
    Yes - there was a few issues:

    1. I had 2 output transistors replaced.
    2. Some repairs to the pre amplifier?
    3. 2 resistors replaced
    4. Plus some dry solder joints fixed.

    My buzzing would drown out the music unless at a substantial volume level. When connected to the pre-outs of a Yamaha RX-V2700, it was a lot worse than when it was hooked to either a Marantz SR-5300 or a SR-8001 - Marantz obviously filter their pre out connections better for interference.

    Anyway, hope all goes well with the 1095, as I will be upgrading to a new one of these in the short term. Let me / us know how you progress with your humming.
    Regards - Gaz from the land of Oz

    Main
    Denon AVR-4520
    Emotiva MPS-2 7 Channel Amp (driving all LSi's)
    Emotiva XPA-2 (driving RTiA9s)
    Cambridge Audio Azur 851C / 850E / 752-BD
    Polk Audio Cherry LSi9s - LSiC - Cherry LSi7s - PSW505 - RTiA9s
    Panasonic TH-P60UT50A 60' 3D Plasma
    Foxtel Digital HD+
    Belkin - Pure AV PF40

    Bedroom
    Denon AVR-3808
    Denon DVD-3930
    Polk Audio SurroundBAR - PSW250
    Fujitsu P42HHS10W/P42HHS10A 42' HD Plasma - HD STB

  20. #20

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    Hello Gaz,

    The humming is now un-noticeable.
    Unlike the buzzing sound you had, I can only hear the buzzing sound with the sound off, and I have to press my ear to the speaker to hear it.
    I want to send the amp in to Rotel for checking, but it just weights too much. I can hardly carry or pick it up. My problem is bringing it to UPS for shipping.

    At present. I am very happy with it. Good ebay buy.

    I don't know why the buzzing sound was minimize. Maybe somebody can explain.

    If anybody is interested....
    I'll be posting another thread on my experiment in using a high end microphone in the MCACC calibration.

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