Question about Alpine PDX-1.1000 1000W x 1 Car Amplifier Car Audio Amplifier

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Alpine PDX 1.1000 low power output - sub not loud

I bought a new Alpine PDX 1.1000 amp to power a Pioneer 12" sub (TS-W1241C) rated at 600 watts nominal/1000watts max. The sub is about 6 years old but worked fine with my old alpine MVR-T757. The problem is that when using the PDX 1.1000 even when I turn the gain all the way up, I can barely hear the sub. I also have a PDX 4.150 used to power my front components (Polk SRS650). I removed the PDX 1.1000 and used the rear 2 channels of the PDX 4.150 to power the sub and it's much louder than when I used the PDX1.1000. Why am I getting such low volume sound when I use the PDX1.000? Could this be a bad unit? I have a 2008 Tahoe, stock alternator and have not yet done the big 3 upgrade. I am running 0/1 gauge wire to the amps then split that into two 4-gauge wires which power the amps. I bought both PDX amps from Sonicelectronix. Thanks

Posted by mwhjunkaz on

  • 5 more comments 
  • mwhjunkaz Mar 31, 2009

    This happens when I try to run both amps. The 4.150 has less power going to it because the output to the components in the front is reduced a little, but still puts out good power to run the comonents. But I also tried running the 1.1000 by itself and it still puts out very littel power. I also connected outside the vehicle directly to the battery and it still has very low output.



    By the way, the 4.150 amp produces great output and beautiful sound on it's own and works like a champ.



    Thanks

  • mwhjunkaz Mar 31, 2009

    When you refer to the switch by the level control I assume you are talking about input voltage switch which has two settings .1V-1.0V or 1.0V-8.0V. Mine is set to 1.0V-8.0V. I did not try the lower setting becuase my head unit puts out 4.0V to the pre-amp outputs. Thanks

  • mwhjunkaz Mar 31, 2009

    I don't know how to check for a short in the input voltage selctor switch. I suppose I will have to have send this back to sonicelectronix. I have searched in google for similar problems and found none like this.

  • mwhjunkaz Apr 17, 2009

    I found the solution. The problem is the alpine documentation. Even though it says to set the input voltage switch to match the voltage of the RCA outs (which for my head unit are 4V), the amp only worked when I set the voltage switch to 0.1-1.0 volts).

  • jason May 11, 2010

    if you just got it then yes I would send it back or see if there is a repair center they have around you

    sorry about your amp and thanks for using fixya.

  • jason May 11, 2010

    have you checked the switch(by the level control) on there to see if there is possibly a short there ? otherwise this will be component related. (the component amp circuit)

  • jason May 11, 2010

    this happens when trying to run both amps. ?

    what about by its self ? , no power to the 4.150

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rteemon

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System not configurate properly go to a pro and let them do for you you have good equipment just need to put together rite.for wht you have you can get better sound than that,,good luck

Posted on Jun 26, 2009

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