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Dayton SA1000 amp: Now running silent !

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  • #1

    Dayton SA1000 amp: Now running silent !

    Earlier today, I sent an e-mail to Dayton regarding two minor issues I have with the SA1000 amp. (I thought I'd go straight to the source for the definitive word on both issues.)

    Here - in case they're of any use to anyone - are my e-mail...
    Originally posted by eljay
    ...
    1. When the amp powers on (either using the power switch, when it senses an audio signal while in "Auto" mode, or when it gets a 12V signal from my receiver), it causes my passive subs to produce a slight "whump" sound. Is there an easy way to resolve this issue on my own, or does the amp need to be repaired or replaced?

    2. When powered on, the amp produces a light humming sound. Is this an issue that can be easily resolved by somehow grounding the amp? If so, what would you recommend that I ground the amp to?

    Thank you for your assistance.
    ...and their reply:
    Originally posted by Dayton rep
    With regards to the thump, I have the HPSA500 connected to a Titanic MKIII 15" subwoofer. I have the same issue and attribute the thump to how large the actual voltage rails are. I've never had an issue, but anytime I come from standby to on, I get a thump.

    The humming is a ground loop. I used a three-to-two prong power plug adapter and that solved that issue. The need for the ground prong is nearly useless nowadays and there's been talk of removing it due to the issue with ground loops.
    ...
    Tags: None
  • #2
    I was getting the same auto on thump, it is very common with sub amps. I fixed it by leaving my sub on all the time. I never shut off my stereo or computer off unless I am leaving town anyway.

    As for the hum, the cheater plug is one method, more are discussed here.

    IMO, Dayton's answers were spot on. :)

    Comment

    • #3
      Do you guys notice this sound with your amps?

      Originally posted by LilGator
      Another noise I noticed is when the amps start to break a sweat I hear a whistling/fluttering sound. Not red lights, solid blue- just spirited levels. I've actually never seen anything but a solid blue light on these. But I notice this only when there's something bass intense but not much other action in the speakers to mask the sound. I think I may have noticed it first when doing close-mics since just the subs were playing. I thought that maybe my projector was shaking/vibrating, but putting my ear up to the amp vents it was coming from within.
      My iPhone was able to pick it up, you'll have to turn up your speakers or use headphones or something: http://soundcloud.com/lilgator/dayton-sa1000
      Most posts made under this account probably influenced by "kool-aid". Done drinking what Chase is offering, and my current views have significantly changed.

      Comment

      • #4
        I have my amp in the A/V stand now, so I cannot easily access the top of it. I did just give it a go, right up to the red light flicker, then backed it down and listened. I am not hearing anything out of the norm.

        Comment

        • #5
          Originally posted by LilGator
          Do you guys notice this sound with your amps?
          Nope, can't say that I've noticed that.
          Originally posted by tesseract
          I was getting the same auto on thump, it is very common with sub amps. I fixed it by leaving my sub on all the time.
          I didn't realize it was a common thing with sub amps. Huh. Well, it's not really a big deal, and since I prefer to power everything down when I'm not using it, it's just something I'll have to live with.
          As for the hum, the cheater plug is one method, more are discussed here.
          Yeah, I was aware of that thread but, while no disrespect was intended, I just figured I'd see what Dayton had to say. :)

          Comment

          • #6
            Originally posted by LilGator
            Do you guys notice this sound with your amps?
            Every sub I have ever had gives/gave a slight on thump. Annoying, but there is not much you can do about it from what I found out many years ago.

            Comment

            • #7
              Originally posted by rygher3
              Originally posted by LilGator
              Do you guys notice this sound with your amps?
              Every sub I have ever had gives/gave a slight on thump. ...
              I think LilGator was referring to this noise: "Another noise I noticed is when the amps start to break a sweat I hear a whistling/fluttering sound." (See post #3)

              (FWIW, my PB12-NSD (325W amp) - and the PB10-NSD (300W amp) I had before it - never thumped when powering on from stand-by mode.)

              Comment

              • #8
                Originally posted by eljay
                I think LilGator was referring to this noise: "Another noise I noticed is when the amps start to break a sweat I hear a whistling/fluttering sound." (See post #3)

                (FWIW, my PB12-NSD (325W amp) - and the PB10-NSD (300W amp) I had before it - never thumped when powering on from stand-by mode.)
                Apparently I shouldn't post in the morning because I cannot read :peeping: I have one of the original CS-18.1 with a plate amp and haven't noticed a sound like that.

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                • #9
                  I thought the reason I had no more Whump was in changing from Auto-on to the 12v trigger. But, your first post indicated you tried that. Just to follow up, do you power the trigger first before the receiver sends a signal? I know my Onkyo will power the trigger even before the receiver is turned on.

                  Otherwise, maybe the amp decided to break-in, and give up on the sudden pop. Guess I could try setting it back to auto-on and check it. I know one thing - the sub pounds out some serious dB when called upon!

                  Comment

                  • #10
                    Originally posted by sbdman
                    I thought the reason I had no more Whump was in changing from Auto-on to the 12v trigger. But, your first post indicated you tried that. Just to follow up, do you power the trigger first before the receiver sends a signal? I know my Onkyo will power the trigger even before the receiver is turned on.
                    I currently have my Marantz triggering my Emotiva amp. I power on the receiver and, pretty much simultaneously, the Emo silently powers on. (That is, none of the 5 speakers connected to it makes any sort of sound.)

                    I unplugged the trigger from the Emo, plugged it into the Dayton and set the switch on the back of the Dayton to "12V". Then I powered on my receiver. The Dayton, like the Emo, powered up immediately, but it was accompanied by the same "whump" from the subs that happens when it's set to "Auto" and it gets a signal. (Which is also the same sound that happens if you power on the amp using the switch on the front plate.)

                    Maybe it'll break in, I dunno. But at least it's not something that'll damage any components.

                    Comment

                    • #11
                      Originally posted by rygher3
                      Apparently I shouldn't post in the morning because I cannot read :peeping: I have one of the original CS-18.1 with a plate amp and haven't noticed a sound like that.
                      Really. I have the 18.1 with plate amp and get a loud thump during power on and a lower thump when going from stand-by. I measured the thump during power on with my RS meter it was around 75db's. Scares the crap out of you if you're not ready for it.

                      I too emailed the Dayton rep and talked with Craig, both told me it was normal. I also power off my equipment so the thump will take some getting use too.

                      Comment

                      • #12
                        Originally posted by tooskinny
                        Really. I have the 18.1 with plate amp and get a loud thump during power on and a lower thump when going from stand-by. I measured the thump during power on with my RS meter it was around 75db's. Scares the crap out of you if you're not ready for it.

                        I too emailed the Dayton rep and talked with Craig, both told me it was normal. I also power off my equipment so the thump will take some getting use too.
                        What I don't hear is that whistling that was described. Every sub I have owned gave/gives me a thump when initially powered on.

                        Comment

                        • #13
                          OK, let's start here. Can anyone hear the whistling sound I described in the recording I linked to? Maybe I'm going crazy? :peeping:

                          http://soundcloud.com/lilgator/dayton-sa1000
                          Most posts made under this account probably influenced by "kool-aid". Done drinking what Chase is offering, and my current views have significantly changed.

                          Comment

                          • #14
                            Originally posted by LilGator
                            OK, let's start here. Can anyone hear the whistling sound I described in the recording I linked to? Maybe I'm going crazy? :peeping:

                            http://soundcloud.com/lilgator/dayton-sa1000
                            I hear the same noise when it's windy and my fly is open :doh! 1:
                            Time waits for no man.

                            Comment

                            • #15
                              I have a GR Research SA 1 amp and get a thump if my 2 channel amp is on before I power up the sub. I turn the sub on first and that took of that...

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