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  • Amp channel cutting out

    I've got a Harman/Kardon HK 590i, just now the right channel started cutting out. If I turn up the volume either on the receiver it's self, or on the PC hooked up to the receiver the right channel will come back. Then it'll go back out again sooner or later.

    This sort of thing seems to be a common problem. I've got an old Onkyo out in the garage with a similar issue and my old Klipsch Promedia 2.1 computer speakers had this problem at some point. It seems to be a really common failure mode on audio equipment.

    Is there any one thing in particular that causes this sort of behavior? I don't have problems with the headphone output on my computer and I've checked all the wires and the connections at the amp and at the speakers so I suspect it's a problem with the amp it's self either on the board or in the volume pot. Any ideas as to how to fix the problem, how I might keep this from happening on pieces of equipment down the road? The Onkyo still has the problem, the HK receiver just started doing it. I replaced the volume potentiometer on my Klipsch PC speakers and it fixed them for a while, but eventually they got cranky again and I just gave them away and stopped using them.

    Thanks for the help
    -Skllit

  • #2
    Does this happen with different sources? I experience this once in a while when I play FLAC files through Foobar and the buffer is not set correctly. Just a thought.
    Some people are addicted to Vicodin. I'm addicted to speaker building.

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    • #3
      A worn out switch, a cracked solder joint, or a bad potentiometer in the signal path can all cause the signal to drop out like that. When you crank the signal, the extra voltage can bridge the gap temporarily giving you your on then off again effect.
      Electronics engineer, woofer enthusiast, and musician.
      Wogg Music
      Published projects: PPA100 Bass Guitar Amp, ISO El-Cheapo Sub, Indy 8 2.1 powered sub, MicroSat, SuperNova Minimus

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      • #4
        It does happen with pretty much any source, my phone, my computer, doesn't matter which input either. I think Wogg is probably correct. I ordered some contact cleaner on amazon prime the other night so we'll try that when it arrives. If that's not it then I guess I have to decide if I feel like tearing the thing apart trying to find the bad joint. Maybe I'll just shove the whole thing in the oven and try to reflow it, we'll see.

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        • #5
          Originally posted by evilskillit View Post
          I've got a Harman/Kardon HK 590i, just now the right channel started cutting out. If I turn up the volume either on the receiver it's self, or on the PC hooked up to the receiver the right channel will come back. Then it'll go back out again sooner or later.

          This sort of thing seems to be a common problem. I've got an old Onkyo out in the garage with a similar issue and my old Klipsch Promedia 2.1 computer speakers had this problem at some point. It seems to be a really common failure mode on audio equipment.

          Is there any one thing in particular that causes this sort of behavior? I don't have problems with the headphone output on my computer and I've checked all the wires and the connections at the amp and at the speakers so I suspect it's a problem with the amp it's self either on the board or in the volume pot. Any ideas as to how to fix the problem, how I might keep this from happening on pieces of equipment down the road? The Onkyo still has the problem, the HK receiver just started doing it. I replaced the volume potentiometer on my Klipsch PC speakers and it fixed them for a while, but eventually they got cranky again and I just gave them away and stopped using them.

          Thanks for the help
          -Skllit

          In the case of the Promedia's the problem is usually the barrel connector on the plate amp breaks or it's solder joints go bad. Because the sub often gets put under a desk and feet push it into the wall, it causes unneeded stress on that connector. I have Promedia 2.1 sub sitting here with that exact problem, I've seen several of these systems that have this issue.

          Most all of these problems are usually due to bad pots, switches, connectors or bad solder joints. If you can spot it and fix it by hand with an iron... That is the best way... If not, the oven/reflow technique can often resurrect if you can strip it down far enough to not have any soft plastic etc... that can melt under the heat.

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          • #6
            Originally posted by evilskillit View Post
            I've got a Harman/Kardon HK 590i, just now the right channel started cutting out. If I turn up the volume either on the receiver it's self, or on the PC hooked up to the receiver the right channel will come back. Then it'll go back out again sooner or later.

            This sort of thing seems to be a common problem. I've got an old Onkyo out in the garage with a similar issue and my old Klipsch Promedia 2.1 computer speakers had this problem at some point. It seems to be a really common failure mode on audio equipment.

            Is there any one thing in particular that causes this sort of behavior?
            Yes.. a short in the speaker or speaker wiring. Is it always the right side and was it always the right side with the other receiver? If you switch speakers L to R does the problem follow the speaker or not?

            Paul O

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            • #7
              Hi,

              I had a similar problem with a NAD amp a while ago. At low "throttle", one channel dropped out from time to time but when I increased the volume, the sound came back.

              Turned out to be a bad speaker output relay. A new one cost abt 5 USD. Fixed the problem in 5 minutes.

              Just my 2 cents...

              Regards//lasse
              Perry Mason talking to his dentist:

              "Do you swear to take the tooth, the whole tooth and nothing but the tooth, so help you God?"

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              • #8
                I had similar problems with a receiver. As lasse stated, it was also the speaker output/ protection relay that had intermittant continuity at the contacts. If present, these relays should be near the speaker terminals on the amp board. The covers of these relays come off and I cleaned the contacts by pulling a tiny strip of super-fine sand paper between the contacts. The problem has not occurred since.

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                • #9
                  He's a SPAMMER!!
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                  • #10
                    Originally posted by djg

                    Welcome to the forum vlommes.
                    Really? You're welcoming a spambot?
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                    • #11
                      Or wave 'Bye-Bye".
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                      • #12
                        Even the spambots are treated politely here
                        Francis

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