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  1. #1

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    Unhappy Power Amp Noise at very low volumes.

    So I just hooked up an Audiosource AMP300 and notice a small amount of noise coming from my tweeters when the volume down or very low.

    I heard it in my 2 channel rig and also when I moved the amp into my HT.

    Almost possitive it is the amp, because I had a couple of power amps in the past and did not experience this problem.

    I heard about the 60HZ Ground noise hum, but I am not sure if that is what is going on. This seems to be a faint buzz coming from the tweeter range.

    Please let me know if there is any way to get rid of this via power cords or other means.

    Thanks!
    Romans 1:16

  2. #2

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    Dedicated circuit?
    BTW you need to come down this weekend:)
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

  3. #3

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    Quote Originally Posted by ben62670 View Post
    Dedicated circuit?
    It is plugged into the "High Current" outlet on my power center.

    Guess I should plug it into the wall and avoid the power center?

    BTW, got my kids this weekend and can't make it.:(
    Thanks!
    Romans 1:16

  4. #4

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    I am not a big fan of running amps in a power center. Try an extension cord to a bathroom outlet. They are almost always on their own circuit;)
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben

  5. #5

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    Thanks Ben.
    Romans 1:16

  6. #6

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    A 60Hz hum won't be coming from the tweeters....if it is, you got real problems.:D

  7. #7

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    Quote Originally Posted by LessisNevermore View Post
    A 60Hz hum won't be coming from the tweeters....if it is, you got real problems.:D
    Those would be some special tweeters!:)
    Romans 1:16

  8. #8

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    Have you tried a cheater plug?

    Also, you could try reducing the input level on the amp a bit.
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  9. #9

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    Quote Originally Posted by adam2434 View Post
    Have you tried a cheater plug?

    Also, you could try reducing the input level on the amp a bit.
    The input level seems like a good idea. Currently is is set to the maximum level.

    What is a cheater plug?

  10. #10

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    A cheater plug is 3-prong to 2-prong adapter, which can be bought at any hardware store.

    I created the same effect by removing the ground prong from some inexpensive Volex power cords.

    This a "do at your own risk" thing because it eliminates the safety ground that exists to protect you if the chassis ever becomes energized.

    A little more info:
    http://electronics.howstuffworks.com/question110.htm
    Last edited by adam2434; 02-27-2009 at 05:40 PM.
    Polk LS90
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    Cambridge Audio C500 Preamp
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    MSB Nelson Link III DAC with P1000 Power Supply, Music Hall DAC 25.2
    Squeezebox Classic
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  11. #11

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    Problem solved. Turned the level on the amp down a tad and plugged into an outlet and not the power center and the noise was gone. Thanks guys.

  12. #12

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    I would think it was more the gain on the amp than the PC. Have you tried plugging the amp back into it to see if it was part of the culprit?
    In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence.

    "The best way to enjoy digital music reproduction is to never listen to good analogue reproduction". - Kenneth Swauger

  13. #13

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    Quote Originally Posted by treitz3 View Post
    I would think it was more the gain on the amp than the PC. Have you tried plugging the amp back into it to see if it was part of the culprit?
    Yes I tried it both ways. I think it was the gain on the amp that made the difference.;) Thanks Tom.
    Romans 1:16

  14. #14

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    Tubes is what you need on those 2B's,,specifically one with EL-34's
    JC approves....he told me so. (F-1 nut)

  15. #15

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    Glad it worked.

    I think it's still worthwhile to try a cheater plug. This may allow you to take the input level back to max without noise.

    Also, down the road, if you want to hear a bigger improvement to bass control and overall dynamics, pick up another 300 and run them mono-bridged. This is what I'm doing for my LS90's. Running 2 Amp Three's produces an "effortless" sound with tons of drive. I noticed that using one amp was an improvement over my Pioneer Elite AVR, but two running bridged is a night and day difference. I think I saw refurbed 300's at J&R for under $200. Running 2 of those for $400 would make many very happy vs. the sound they are getting from their run-of-the-mill AVR's.
    Polk LS90
    Polk CS400i
    Polk FX500i
    Outlaw LFM-1 Sub
    Polk Monitor 7C (secondary location)
    Pioneer Elite VSX-45TX
    Audiosource Amp Three (2), Amp One/A (1)
    Cambridge Audio C500 Preamp
    Sony 222ES CD/SACD
    MSB Nelson Link III DAC with P1000 Power Supply, Music Hall DAC 25.2
    Squeezebox Classic
    Sony BDP-S1000ES
    JVC DLA-HD250 Projector
    Da-Lite HCCV - 100" Permwall 16:9
    Time Warner HD Cable
    Panamax 500 DBS
    MIT, Blue Jeans, AR, Outlaw Cables
    System Showcase

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