Buzzing Amp

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  • rich0372
    Member
    • Jul 2004
    • 83

    Buzzing Amp

    I have a buzzing sound coming from my amp it's weird comes in waves about 5 seconds each quiet then buzz back and fourth I allready have an isolater on my cable line. my old amp didn't do this any thoughts??
  • Andrew Pratt
    Moderator Emeritus
    • Aug 2000
    • 16507

    #2
    What happens when you pull the cable line completely?

    Comment

    • rich0372
      Member
      • Jul 2004
      • 83

      #3
      Originally posted by Andrew Pratt
      What happens when you pull the cable line completely?

      It still does it I powered the amp down for a while then turned back the niose is not as loud now but when I turn on my receiver it gets loud for a few seconds then then down to a whisper Rich

      Comment

      • David Meek
        Moderator Emeritus
        • Aug 2000
        • 8938

        #4
        Something cyclical like that makes me think it's some power source you have on the circuit. Try running a heavy-guage extension cord from the amp to a plug in the farthest corner of the house you can reach. That plug should be on a separate circuit. If you need to, try it with several plugs all over the house and see if the hum disappears. If so, then it's somenting on that circuit and you may be able to isolate it.

        Generally, cable companies are the culprit for ground-loop hums as they will in many cases put in a second ground and not use the existing "house" ground. But, from your description and as you've disconnected the cable entirely, then that ain't it (as they say here in Texas).
        .

        David - Trigger-happy HTGuide Admin

        Comment

        • Andrew Pratt
          Moderator Emeritus
          • Aug 2000
          • 16507

          #5
          I've seen things like regrigerator or freezer compressors do strange things like that as they cycle on and off so I'm with David in that its likely something on that power circuit that's doing the humming.

          Comment

          • ht_addict
            Senior Member
            • Dec 2002
            • 508

            #6
            Do you have your amp plugged into your HTS5100? Try running it straight to the wall and see what happens. Other than that its time to remove all the interconnects from your gear and plug them back in one at a time till it happens. Before you do that I would also suggest you replace any coax interconnects with optical between your components(dvd to receiver, cable/sat to receiver, etc). Worked for me when I had a buzz problem.

            Comment

            • rich0372
              Member
              • Jul 2004
              • 83

              #7
              I don't know how but, the amp doesn't buzz anymore it's dead quiet the funny thing is I didn't do anything I was going to play with it today to figure it out. I guess the AMP God stopped by my house while I was at work Rich

              Comment

              • Stoney
                Senior Member
                • Dec 2004
                • 232

                #8
                It may be some other appliance in your house inducing a noise on your AC lines. I had a vaporizer that was in a different room that would induce a hum in my sub amps even when they were in standby mode. If your hum comes back, happy searching.
                Emotiva UPA-700 Amp
                Emotiva UMC 200 pre/pro
                B&W DM605 S2 Mains
                DM602 S2 Surrounds
                DM601 S2 Rear Surrounds
                CC6 S2 Center.
                ASW 1000 Sub

                Comment

                • mitch57
                  Senior Member
                  • Nov 2004
                  • 429

                  #9
                  I went through a very similar situation. I even bought a new amp from a different manufacturer and had the same problem. Read my post.



                  If it comes back I have a solution for you. It took me months to find one and it's not cheap but it solved the problem.
                  Mitch
                  :stupidpc:

                  Comment

                  • brucek
                    HTG Expert
                    • Aug 2000
                    • 303

                    #10
                    I have a buzzing sound coming from my amp it's weird comes in waves about 5 seconds each quiet then buzz back and fourth......................

                    I don't know how but, the amp doesn't buzz anymore
                    I suspect your joy will be short lived...

                    What you're experiencing is undoubtedly due to DC bias in the hot to neutral AC line. Toroidal transformers are notorious for this problem (low impedance and small cores) and are usually spec'd to tolerate a certain amount of DC flux offset on the line. Some amplifiers are more susceptible to this annoyance than others.

                    I have an HK5800 amplifier that I use in my office that has always suffered from this problem (although I've masked it). The buzz/humm noise would come and go at various times during the day. Quite annoying.

                    There are a couple of ways to block the DC from reaching your amplifier. One is with a DC blocker circuit (a poor solution) or with a balanced power unit. The DC won't pass through the balanced power unit.

                    I was reading an interesting white paper from Plitron that addresses the DC voltage problem and indicates their transformers are somewhat tolerant of an asymmetrical line. A bit technical, but addresses the DC problem.



                    In part:

                    =========================
                    "Designing low noise transformers under adverse line conditions with asymmetrical line (DC components present) follows the same procedure and delivers comparable results. Therefore Plitron will specify the DC-voltage which the low noise transformer can handle without getting noisy, according to the required performance level.

                    An alternative approach to handle asymmetrical line used by some manufacturers is called a DC-blocker. This is a circuit comprised of diodes, capacitors and resistors, and placed externally to the transformer in the primary circuit. This DC-blocker has implications in the total safety agency approvals of the product, since it is used in the primary circuit. The effectiveness of the DC-blocker approach is questionable, and it may have limited ability to work in severe line conditions.

                    Plitron uses a transformer-based solution requiring no external components to reduce transformer noise under asymmetrical line conditions. Plitron’s approach is to optimize the transformer to perform under the expected line conditions, and provide noise performance specifications. A transformer based solution is more elegant and effective, is less costly to implement, and eliminates the need for any external components in the primary circuit with the sonic disadvantages. It may also simplify the necessary safety approvals."
                    =======================

                    Anyway, if the problem returns, as a test, perhaps you could borrow someone's balanced power unit and see if that solves the problem. I suspect it will.

                    brucek

                    Comment

                    • rich0372
                      Member
                      • Jul 2004
                      • 83

                      #11
                      [QUOTE=brucek]I suspect your joy will be short lived...

                      So far so good still no buzz 8) Mitch what was your solution to the buzz did you fix it. Also Brucek what is a balanced power unit is it a line conditioner I have a monster power conditioner but I don't have my amp plugged in to it The manufacturer recomeneds plugging it in to the wall Thanks for all the replies Rich

                      Comment

                      • rich0372
                        Member
                        • Jul 2004
                        • 83

                        #12
                        IT'S BUZZING AGAIN Brucek you were right I even tried plugging it in to my monster conditioner with no difference I used a cheater plug also with no change
                        Now at idle it has a slight buzz then when I turn my reciever on it gets louder for 5 seconds or so then back to a slight buzz again Rich

                        Comment

                        • brucek
                          HTG Expert
                          • Aug 2000
                          • 303

                          #13
                          Here's a pretty good explaination of balanced power by Equitech.

                          Balanced power explained

                          There are those that have made their own here at HTG (do a search), and they also may be purchased at B-P-T or Equitech.

                          The large ones are fairly expensive, so it would be a nice idea to borrow one if you could to test its effectiveness on your problem....

                          brucek

                          Comment

                          • eddiem67
                            Senior Member
                            • Jun 2004
                            • 139

                            #14
                            Is this your cinenova?
                            My Car Audio

                            Comment

                            • rich0372
                              Member
                              • Jul 2004
                              • 83

                              #15
                              Originally posted by eddiem67
                              Is this your cinenova?

                              YES Rich

                              Comment

                              • mitch57
                                Senior Member
                                • Nov 2004
                                • 429

                                #16
                                [QUOTE=rich0372]
                                Originally posted by brucek
                                I suspect your joy will be short lived...

                                So far so good still no buzz 8) Mitch what was your solution to the buzz did you fix it. Also Brucek what is a balanced power unit is it a line conditioner I have a monster power conditioner but I don't have my amp plugged in to it The manufacturer recomeneds plugging it in to the wall Thanks for all the replies Rich
                                This is what worked for me. This thing is utterly amazing. The company told me that if it didn't solve my problem they would take it back and pay the return shipping as well. Needless to say I still have it and it works GREAT!!! :T



                                I bet this thing will solve your problem. And if it doesn't they will take it back.
                                Mitch
                                :stupidpc:

                                Comment

                                • eddiem67
                                  Senior Member
                                  • Jun 2004
                                  • 139

                                  #17
                                  Definitely call them, they have excellent customer service, mine buzzes when I turn it on but thats it, so I just leave the amp on all the time, it works great.
                                  My Car Audio

                                  Comment

                                  • Aldo
                                    Senior Member
                                    • Sep 2005
                                    • 448

                                    #18
                                    I had more less the same problem with a krell cx700 I was going crazy about the noise, 2 months later I notice that turning my wife TV off (that is in other room) fix the problem, Some times the line deliver wierd things to amps!

                                    Comment

                                    • dbart
                                      Member
                                      • Jan 2003
                                      • 39

                                      #19
                                      Power into your home is connected to everyone else on the street that shares the same utility transformer. Ground loops and noise eminating from your neighbour is not uncommon and does explain it's intermittent character. Yes a balanced power solution should solve the problem.

                                      Comment

                                      • mitch57
                                        Senior Member
                                        • Nov 2004
                                        • 429

                                        #20
                                        rich0372,

                                        So did you ever get this problem solved? If so what did you do? If not, what have you tried?
                                        Mitch
                                        :stupidpc:

                                        Comment

                                        • rich0372
                                          Member
                                          • Jul 2004
                                          • 83

                                          #21
                                          Originally posted by mitch57
                                          rich0372,

                                          So did you ever get this problem solved? If so what did you do? If not, what have you tried?
                                          mitch57 No I didn't fix the buzzing I find if I leave the amp 24/7 it buzzes much less I also have it plugged in to my monster power center but, I don't think that made a difference I think this is a problem a lot of people have with this amp I've read posts from other forums stating they leave them on 24/7
                                          The buzzing comes from inside the amp even if I disconnect everything it still does it so I just leave it on all the time It's to bad cause this amp really does sound good Rich

                                          Comment

                                          • mitch57
                                            Senior Member
                                            • Nov 2004
                                            • 429

                                            #22
                                            Originally posted by rich0372
                                            mitch57 No I didn't fix the buzzing I find if I leave the amp 24/7 it buzzes much less I also have it plugged in to my monster power center but, I don't think that made a difference I think this is a problem a lot of people have with this amp I've read posts from other forums stating they leave them on 24/7
                                            The buzzing comes from inside the amp even if I disconnect everything it still does it so I just leave it on all the time It's to bad cause this amp really does sound good Rich
                                            I would still recommend you try the PS Audio UPC 200HB. Afterall, you have nothing to loose. If it doesn't work return it. If it does work and you don't feel it's worth the money... Return it. They even pay the return shipping. It works great for me! I wouldn't give it up for anything.
                                            Mitch
                                            :stupidpc:

                                            Comment

                                            • eddiem67
                                              Senior Member
                                              • Jun 2004
                                              • 139

                                              #23
                                              Earthquake does not recommend running there amps through a conditioner of any sort. I spoke with one of the design engineers, he said a dedicated 20 amp line will work best.
                                              My Car Audio

                                              Comment

                                              • mitch57
                                                Senior Member
                                                • Nov 2004
                                                • 429

                                                #24
                                                Originally posted by eddiem67
                                                Earthquake does not recommend running there amps through a conditioner of any sort. I spoke with one of the design engineers, he said a dedicated 20 amp line will work best.
                                                I think you will get the same answer from every amp manufacturer. But the bottom line is that as long as the conditioner is not current limiting I don't see that there is any problem. I'm sure there are others that will chime in and correct me if I am wrong.
                                                Mitch
                                                :stupidpc:

                                                Comment

                                                • rich0372
                                                  Member
                                                  • Jul 2004
                                                  • 83

                                                  #25
                                                  Originally posted by mitch57
                                                  I think you will get the same answer from every amp manufacturer. But the bottom line is that as long as the conditioner is not current limiting I don't see that there is any problem. I'm sure there are others that will chime in and correct me if I am wrong.
                                                  mitch I agree with you after I plugged my amp in to my conditioner even at very loud levels the amp draw was only 4.5 to 5.0 amps Rich

                                                  Comment

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