PA1200.1 Issues

jasonkelly
jasonkelly Posts: 3
edited May 2011 in Car Audio & Electronics
Hey guys I was wondering if you might be able to help me out with an issue I'm having. I've got my amp (pa1200.1) wired up to two sr124-dvc subs taking it down to 1 ohm. I was playin around with them and I got them going pretty good. All of a sudden the sound cut out. Now the LED on the side is not red, but it does have a reddish tint to it making it more of a yellow than green. voltage across the speaker terminals is essentially 0 volts. Any thoughts?
Post edited by jasonkelly on
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Comments

  • Vital
    Vital Posts: 747
    edited January 2011
    How long did you have those subs hooked up to the amp?
    Is wiring correct?? Power/groud? Fuse? speaker wires for 1ohm?

    Did you buy it brand new? warranty?
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  • jasonkelly
    jasonkelly Posts: 3
    edited January 2011
    theyve been hooked up for a few months. wiring is all correct
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  • MacLeod
    MacLeod Posts: 14,358
    edited January 2011
    Whats your gain set at? My amp's lights look yellowish too. Dont think thats the problem. Im wondering if youve got your gain set too high, youve fried your subs.

    Do you have another sub or speaker you can hook the amp up to real quick just to make sure its still playing or not?
    polkaudio sound quality competitor since 2005
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  • nstillmatic
    nstillmatic Posts: 10
    edited April 2011
    I don't think it's likely he's fried his subs because his amp is only 1200W, and each SR124 has an RMS of 700 and should be able to withstand any clipping longer than his amp.
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  • arun1963
    arun1963 Posts: 1,797
    edited April 2011
    Its a 4 month old thread and I'm sure the problem is worked out by now. Meanwhile, you're wrong.
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  • nguyendot
    nguyendot Posts: 3,594
    edited April 2011
    nstillmatic wrote: »
    I don't think it's likely he's fried his subs because his amp is only 1200W, and each SR124 has an RMS of 700 and should be able to withstand any clipping longer than his amp.

    Common misconception. You're more likely to fry your subs with too little power than too much. More power is better - it can control the subs better without clipping. When you clip/square wave a sub, it extends the voice coil out and it doesn't move, which means there is no air moving, causing the voice coil to overheat and blow.

    What it sounds like however is the amp has blown a mosfet or something.
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  • Sherardp
    Sherardp Posts: 8,038
    edited April 2011
    Def sounds like a blown amp. Is that amp 1 ohm stable?
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  • arun1963
    arun1963 Posts: 1,797
    edited April 2011
    Yes the amp is 1 ohm stable.

    Most likely a case of blown subs due to running gains too high.
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  • MacLeod
    MacLeod Posts: 14,358
    edited April 2011
    nguyendot wrote: »
    Common misconception. You're more likely to fry your subs with too little power than too much. More power is better - it can control the subs better without clipping. When you clip/square wave a sub, it extends the voice coil out and it doesn't move, which means there is no air moving, causing the voice coil to overheat and blow.

    The only thing that blows speakers aside from physical damage like stabbing a screwdriver thru the cone is overpowering.

    You either build up more heat in the voice coil than it can dissipate or you push the suspension beyond its limits. Too little power will never hurt a speaker.

    Why people think this is because they stick a 50 watt amp on a 100 watt speaker, want more volume so they turn the volume up too much and the amp clips which sends out a signal limited only by the input voltage so that 50 watt amp sends out 130 watts or so which thus fries that 100 watt speaker.
    polkaudio sound quality competitor since 2005
    MECA SQ Rookie of the Year 06 ~ MECA State Champ 06,07,08,11 ~ MECA World Finals 2nd place 06,07,08,09
    08 Car Audio Nationals 1st ~ 07 N Georgia Nationals 1st ~ 06 Carl Casper Nationals 1st ~ USACi 05 Southeast AutumnFest 1st

    polkaudio SR6500 --- polkaudio MM1040 x2 -- Pioneer P99 -- Rockford Fosgate P1000X5D
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  • tater6061
    tater6061 Posts: 14
    edited May 2011
    True that...If you are in the neighborhood of the RMS you will be fine. If you are ported use the subsonic filter.
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