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Speakers cutting out

Discussion in 'Audio & Video' started by Gitmo, Nov 19, 2009.

  1. Nov 19, 2009 at 8:19 PM
    #1
    Gitmo

    Gitmo [OP] Well-Known Member

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    Alright so here's my problem.. I Installed a new HU (alpine cda-105) and an amp under the driver's seat (alpine mrp-f250). Had the amp hooked up to my factory speakers because I didn't have my aftermarket speakers till a week later. Well the factory speakers would cut out when I turned the volume up high.. about 20 or so but if I had it at 19 it would be fine. I figured it was just the shitty stock speakers but once I installed the aftermarket speakers they still cut out. The speakers are Polk Audio db6501 components, I rechecked the connections to make sure everything is right.. I tried turning up the gain but still cuts out, also tried turning it down but no bueno.

    Have any ideas what it could be?
     
  2. Nov 21, 2009 at 2:09 PM
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    Gitmo

    Gitmo [OP] Well-Known Member

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    Anyone?..
     
  3. Nov 21, 2009 at 2:16 PM
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    Pitt1552

    Pitt1552 Well-Known Member

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    does your amp have any sort of "protection" or "fault" light? if so is it on when they cut out?
     
  4. Nov 21, 2009 at 5:34 PM
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    Gitmo

    Gitmo [OP] Well-Known Member

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    No, it just has a blue light on top showing that it's on and getting power. I watched it while the speakers cut out and it didn't change nor did any other lights pop up. I just tried bridging the speakers.. still same result. I'm thinking it might be the HU or wiring but have no idea why.
     
  5. Nov 21, 2009 at 7:32 PM
    #5
    Pitt1552

    Pitt1552 Well-Known Member

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    hi or low level input on the amp? you could also try only connecting one speaker and seeing what happens. also try connecting the speakers through the head unit only. kind of a pain in the ass, but short of havin another amp or speakers or head unit there to swap, its the only way to isolate the issue. could also try metering the speakers to check for resistance and make sure they are w/in spec for the amp.
     
  6. Nov 21, 2009 at 10:00 PM
    #6
    Gitmo

    Gitmo [OP] Well-Known Member

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    Alright so I only had one speaker connected to the HU and it didn't have the problem of cutting out. It only distorted when it got too loud.. does this mean my amp has something wrong with it? Or could there be a way to change the mode or something?
     
  7. Nov 22, 2009 at 9:38 AM
    #7
    Pitt1552

    Pitt1552 Well-Known Member

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    Did you tune the amp when you installed it( turn amp volume all the way down, head unit all the way up, adjust amp volume to proper level and go from there, that is a very basic way of tuning, google may offer more detailed methods). Try each of your speakers individually as well, if there is an issue w/ one it could cause the problem w/ the amp. Also, i'd try a different amp if none of these things solve the issue. you shouldn't need to bridge the channels. Another thing to try would be trying each individual channel on the amp, if other options dont get you anywhere. Kind of jumbled as far as what to do, but short of having additional equipment to try there are a few hoops to jump through to get what ya need. That being said it doesnt sound like your hu is the issue.

    It has been awhile since i've done audio work, so i'm not as up on things as i used to be, if anyone else has any thoughts feel free to chime in!
     
  8. Nov 22, 2009 at 10:58 AM
    #8
    Tony D

    Tony D Well-Known Member

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    Do the gain adjustment thing desribed above. Hook 1 speaker up at a time and test with each - see if it only cuts out on one. Could be a testy speaker or pinched wire that is shorting when it gets hot enough or enough voltage. Could also be a bum amp.

    If you find it is cutting out on 1 amp channel or 1 speaker all the time, try swapping speakers and channels - you can use that to determine if it's the amp or speaker/speaker leads.

    There is a small chance its the deck, but I'd start with the amp/speakers
     
  9. Nov 23, 2009 at 6:25 PM
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    Gitmo

    Gitmo [OP] Well-Known Member

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  10. Nov 23, 2009 at 6:33 PM
    #10
    Tony D

    Tony D Well-Known Member

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    I would get the full size amp myself.
     
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