Rsp 1068 Hum

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  • mitzipurr
    Member
    • Feb 2005
    • 47

    Rsp 1068 Hum

    Hi Folks

    I am devastated my beloved RSP1068 which has up to now worked perfectly has developed a intermittent hum. Even with both power amps turned off you can still hear it anybody any ideas please??? :cry:
  • ejuanpiman
    Senior Member
    • Nov 2006
    • 100

    #2
    sounds like a ground loop, look for a screw in the back of the chassis and ground it to something with a wire, good source is the screw in the middle of an outlet

    Comment

    • mitzipurr
      Member
      • Feb 2005
      • 47

      #3
      Originally posted by ejuanpiman
      sounds like a ground loop, look for a screw in the back of the chassis and ground it to something with a wire, good source is the screw in the middle of an outlet

      Many thanks for that. I am not sure what you mean by outlet. Do you mean the center screw in a electric socket. If its any help I live in Spain and the voltage is 220v.

      I am also puzzled why its only just started. That is why I thought of a fault on the processor first? .


      Many thanks

      Comment

      • ejuanpiman
        Senior Member
        • Nov 2006
        • 100

        #4
        well yea, the electric socket, what i mean by the middle screw is atleast in the united states its a common ground, thats what i did, if you look at the electric socket faceplate it is attached to the wall by a screw in the middle, wich holds it against the wall, i attactched a 16 gauge wire to it and it works fine now.

        Comment

        • Kevin D
          Ultra Senior Member
          • Oct 2002
          • 4601

          #5
          Isthe 1068 itself humming, or humming through the speakers?

          Kevin D.

          Comment

          • mitzipurr
            Member
            • Feb 2005
            • 47

            #6
            Originally posted by Kevin D
            Isthe 1068 itself humming, or humming through the speakers?

            Kevin D.

            Hi Kevin its humming through the speakers but if you turn the amps off its still there. Even if you turn the volume to 1 you can still hear it as loud but if you turn the volume to zero no hum. I have disconnected both subwoofer leads from processor, unpluged optical lead from satellite reciever but no difference. The speakers are Def tech BP2002 with powered subwoofers. The amps are RB985mk2 and RB993 if this helps.


            Thanks for any help

            Comment

            • Kevin D
              Ultra Senior Member
              • Oct 2002
              • 4601

              #7
              Still there when you unplug power from the speakers (built in sub amps)?

              Kevin D.
              Last edited by Kevin D; 27 January 2007, 22:27 Saturday.

              Comment

              • ejuanpiman
                Senior Member
                • Nov 2006
                • 100

                #8
                yea id follow kevins remark, i had something similar only it would go away when i would turn on the amp, sounds like a ground loop

                Comment

                • mitzipurr
                  Member
                  • Feb 2005
                  • 47

                  #9
                  Originally posted by Kevin D
                  Still there when you unplug power from the speakers (built in sub amps)?

                  Kevin D.

                  Yes even with no power from the built in sub amps just the same.

                  Comment

                  • mitzipurr
                    Member
                    • Feb 2005
                    • 47

                    #10
                    Originally posted by ejuanpiman
                    yea id follow kevins remark, i had something similar only it would go away when i would turn on the amp, sounds like a ground loop

                    Ejuanpiman I have followed your advice and attached a wire to the back of the processor but just left the other end on the ceramic tiled floor and fingers crossed no hum for the last two hours. It could just be a coincidence (hope not) because it is something that comes and goes.


                    Many thanks

                    Comment

                    • ejuanpiman
                      Senior Member
                      • Nov 2006
                      • 100

                      #11
                      mitzipurr i dont know how well the ground is just by leaving it on the floor, i would suggest youd try with a well ground just an observation..., have you done any current change to your setup before this started?

                      Comment

                      • mitzipurr
                        Member
                        • Feb 2005
                        • 47

                        #12
                        Originally posted by ejuanpiman
                        mitzipurr i dont know how well the ground is just by leaving it on the floor, i would suggest youd try with a well ground just an observation..., have you done any current change to your setup before this started?

                        No have not changed anything its wierd have not heard it all tonight since doing the wire thing like you suggest. I will try tomorrow and find a better earth. Forget to mention that everything is plugged into a Rotel RLC1050 power distributer which in over two years has never give me a problem.

                        Comment

                        • ejuanpiman
                          Senior Member
                          • Nov 2006
                          • 100

                          #13
                          if it works then great you found your problem...

                          Comment

                          • mitzipurr
                            Member
                            • Feb 2005
                            • 47

                            #14
                            Originally posted by ejuanpiman
                            if it works then great you found your problem...
                            Hi second nights viewing with no hum so fingers crossed its cured . Will keep you posted.


                            Many thanks

                            Comment

                            • mitzipurr
                              Member
                              • Feb 2005
                              • 47

                              #15
                              Originally posted by mitzipurr
                              Hi second nights viewing with no hum so fingers crossed its cured . Will keep you posted.


                              Many thanks

                              Just to let everbody know still no hum :T


                              Many thanks

                              Comment

                              • ejuanpiman
                                Senior Member
                                • Nov 2006
                                • 100

                                #16
                                no problem, make sure you grounded it well with a good cable and a good ground.

                                Comment

                                • ekkoville
                                  Senior Member
                                  • Aug 2004
                                  • 392

                                  #17
                                  Mitz, what kind of cable did you use to ground with and to what screw? Just curious.
                                  ____________________
                                  Erik
                                  Just another case of the man trying to keep us down! :B

                                  Comment

                                  • Club1820
                                    Senior Member
                                    • Jan 2006
                                    • 269

                                    #18
                                    But its not actually grounded, right? Isnt the other end just hanging there on the floor?
                                    Rotel 1068, Rotel 1060, Rotel 1055, Rotel 1095, Rotel 956, Rotel RLC-1040, M&K VX-860 Sub, Whatmough M30s, Squeezebox 3

                                    Comment

                                    • ejuanpiman
                                      Senior Member
                                      • Nov 2006
                                      • 100

                                      #19
                                      yea it is, i mean your supposed to look at the outlet, and on the outlet on your wall theyre is a screw in the middle in between both outputs that holds the faceplate to the wall, that screw is comon ground, so you attach a 16 awg wire from the screw on the outlet to a screw on the chassis of your reciever, processor, tunner whatever is the problem to eliminate the ground loop.

                                      Comment

                                      • Club1820
                                        Senior Member
                                        • Jan 2006
                                        • 269

                                        #20
                                        Originally posted by ejuanpiman
                                        yea it is, i mean your supposed to look at the outlet, and on the outlet on your wall theyre is a screw in the middle in between both outputs that holds the faceplate to the wall, that screw is comon ground, so you attach a 16 awg wire from the screw on the outlet to a screw on the chassis of your reciever, processor, tunner whatever is the problem to eliminate the ground loop.
                                        Not so sure - see below. Unless he changed something and didnt post. ?

                                        Originally posted by mitzipurr
                                        Ejuanpiman I have followed your advice and attached a wire to the back of the processor but just left the other end on the ceramic tiled floor and fingers crossed no hum for the last two hours. It could just be a coincidence (hope not) because it is something that comes and goes.
                                        Rotel 1068, Rotel 1060, Rotel 1055, Rotel 1095, Rotel 956, Rotel RLC-1040, M&K VX-860 Sub, Whatmough M30s, Squeezebox 3

                                        Comment

                                        • ejuanpiman
                                          Senior Member
                                          • Nov 2006
                                          • 100

                                          #21
                                          im assuming he did attach it to something, and i hope he just doesnt have it hanging on the floor...

                                          Comment

                                          • Elvis
                                            Senior Member
                                            • Jan 2005
                                            • 106

                                            #22
                                            Man.....I'm confused.You turn off the amp and the 1068 hums through speakers,then hook a wire to the back of the 1068 and lay it on the floor and no hum.All's I can say is "very interesting".

                                            Comment

                                            • ejuanpiman
                                              Senior Member
                                              • Nov 2006
                                              • 100

                                              #23
                                              yea and guess what!, you attach a wire to the positive and negative outputs of your amplifier turn it on, and music comes out of these round things called speakers wow !, no thats "very intresting"

                                              Comment

                                              • mitzipurr
                                                Member
                                                • Feb 2005
                                                • 47

                                                #24
                                                Originally posted by ekkoville
                                                Mitz, what kind of cable did you use to ground with and to what screw? Just curious.

                                                Sorry for no follow up folks. Since doing the mod with the wire zero hum. Coud be just coincidence?

                                                ekkoville took a screw at the back of the cover. Used 5 amp mains wire bared a end and twisted it in a loop pushed the screw through the loop screwed the screw back into the chassis cover then bared the other end and left it trailing on the floor where it still is! I live in Spain and we have ceramic tiled floors. Could to do with it working?

                                                Comment

                                                • mitzipurr
                                                  Member
                                                  • Feb 2005
                                                  • 47

                                                  #25
                                                  Originally posted by Club1820
                                                  But its not actually grounded, right? Isnt the other end just hanging there on the floor?

                                                  Yes but the strange thing it is working.

                                                  Comment

                                                  • mitzipurr
                                                    Member
                                                    • Feb 2005
                                                    • 47

                                                    #26
                                                    Originally posted by ejuanpiman
                                                    yea it is, i mean your supposed to look at the outlet, and on the outlet on your wall theyre is a screw in the middle in between both outputs that holds the faceplate to the wall, that screw is comon ground, so you attach a 16 awg wire from the screw on the outlet to a screw on the chassis of your reciever, processor, tunner whatever is the problem to eliminate the ground loop.

                                                    ejuanpiman given the state of wiring in most Spanish houses I would be very reluctant to go anywhere near connecting a expensive processor by such a method. I

                                                    Comment

                                                    • mitzipurr
                                                      Member
                                                      • Feb 2005
                                                      • 47

                                                      #27
                                                      Originally posted by Club1820
                                                      Not so sure - see below. Unless he changed something and didnt post. ?

                                                      Nothing changed and still no hum!

                                                      Comment

                                                      • mitzipurr
                                                        Member
                                                        • Feb 2005
                                                        • 47

                                                        #28
                                                        Originally posted by ejuanpiman
                                                        im assuming he did attach it to something, and i hope he just doesnt have it hanging on the floor...

                                                        No still on the floor

                                                        Comment

                                                        • mitzipurr
                                                          Member
                                                          • Feb 2005
                                                          • 47

                                                          #29
                                                          Originally posted by Elvis
                                                          Man.....I'm confused.You turn off the amp and the 1068 hums through speakers,then hook a wire to the back of the 1068 and lay it on the floor and no hum.All's I can say is "very interesting".

                                                          I am also totally confused but now its has quet as a mouse weird :E

                                                          Comment

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