RB-1080 repair and change in sound

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  • mave
    Member
    • Dec 2004
    • 34
    #1

    RB-1080 repair and change in sound

    I've had my RB-1080 repaired. This time not a fuse but a "resistance" (translated from Dutch - hope I'm right..) needed to be changed.
    Can that result in a different sound ? It is as if the bass is less tight and the sound stays more inside the speakers...
    Or will some more hours of using it solve the problem ??

    Thanks
    Tags: None
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    • JDH
      Senior Member
      • Sep 2004
      • 270
      #2
      Originally posted by mave
      I've had my RB-1080 repaired. This time not a fuse but a "resistance" (translated from Dutch - hope I'm right..) needed to be changed.
      Can that result in a different sound ? It is as if the bass is less tight and the sound stays more inside the speakers...
      Or will some more hours of using it solve the problem ??

      Thanks
      I had the Fuse/Resistor/Capacitor modification to hopefully fix the left channel fuse failure problem, I didn't notice any change in sound quality, however for what ever reason I notice that it runs considerably cooler than the two unmodified RB-1080 power amps I had originally prior to their exchanged for a new modified unit.
      Last edited by JDH; 13 June 2005, 07:56 Monday.
      Bits of HT & 2ch Stuff: Rotel, Pro-ject, Oppo, Bel Canto, Elektra Audio, Benchmark, Panasonic, DSPeaker, Epson, Slim Devices, Belkin, Philips Pronto, Harmony, URC, Sennheisser, AKG, HTPC under development, KEF, Whatmough, Definitive Technology & Pardigm Signiture speakers
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        • DrJRapp
          Super Senior Member
          • Apr 2003
          • 1204
          #3
          The whole fix of the 1080 consists of changing a resistor, a capacitor, the fuses and readjusting the bias for optimum. When my 1080 repair was done, I too noticed a sound quality change similar to what you describe. The explanation from Rotel was that the bias adjustment caused the shift in sound at lower levels.
          Jerry Rappaport
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            • mave
              Member
              • Dec 2004
              • 34
              #4
              DRJRapp, meaning I have to live with it or have them "undo" the modification ??
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                • DrJRapp
                  Super Senior Member
                  • Apr 2003
                  • 1204
                  #5
                  Do you find the sound less pleasing? I didn't. I found the 1080 to have more bottom end at lower volumes. Perhaps you may call this "less tight"...to me there was just more there.
                  Jerry Rappaport
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                    • mave
                      Member
                      • Dec 2004
                      • 34
                      #6
                      Yes, I like the bass to sound strong and tight and not a bit "zooming" like it does now. I'll contact them to see what can be done. Maybe they used different resistors or something....
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                        • Cowanrg
                          Senior Member
                          • Feb 2004
                          • 225
                          #7
                          some parts take time to break in. not sure of that mod would apply though...

                          you could always readjust the bias
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                            • gianni
                              Senior Member
                              • Nov 2002
                              • 524
                              #8
                              Does anyone know if the problem requiring this fix to the rb-1080 affects the rb-1070 or is this specific to the 1080?

                              Thanks
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                                • Mitchell
                                  Senior Member
                                  • Sep 2004
                                  • 202
                                  #9
                                  Originally posted by gianni
                                  Does anyone know if the problem requiring this fix to the rb-1080 affects the rb-1070 or is this specific to the 1080?

                                  Thanks
                                  The problem to the 1080 is unique to the 1080 as I understand it.
                                  Mitchell
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