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Thread: Amplifier Enters Protection Mode When Volume Is Up

  1. #1
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    Amplifier Enters Protection Mode When Volume Is Up

    I have touched on this briefly in other threads, but have never gotten a solid answer to the question...

    Here's my setup:
    Alpine MRV-F450 5-Channel Amplifier
    Audiobahn ALUM12Q 12" subwoofer (dual 6-ohm voice-coil @ 3-ohms)
    iBase MB870 MotherBoard w/ P4 1.8GHz
    Lilliput 7" touchscreen

    Basically, whenever I am playing a song with a lot of bass and I turn the volume up, my amplifier will go into protection mode for a few seconds, and then return to normal. If I have not lowered the volume when it resumes, it will usually go right back into protection mode. I have tried grounding the amp to a different point on the car but am still having the same problem.

    It was suggested that I was possibly overloading the amp but I don't think that's the case because the gain on the sub channel is turned below the half-way mark and the speaker does not sound like it is distorting. Any ideas?

    Thanks.
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    -iBase MB870 mini-ITX/P4 1.8GHz/256MB/ATI Radeon 9100 IGB onboard video
    -Alpine MRV-F450 5 Channel Amplifier
    -Lilliput 7" VGA touchscreen

  2. #2
    Maximum Bitrate Vchat20's Avatar
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    what about your power connection? are you using proper guage wire for your amp?
    Your everyday carpc geek and tech guru at your service. *bow*

  3. #3
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    Quote Originally Posted by Vchat20
    what about your power connection? are you using proper guage wire for your amp?
    Yea, sorry about that...I've got 4 Gauge wire coming from the battery+ and 4 Gauge wire going to a grounding spot in the trunk.
    __________________
    -iBase MB870 mini-ITX/P4 1.8GHz/256MB/ATI Radeon 9100 IGB onboard video
    -Alpine MRV-F450 5 Channel Amplifier
    -Lilliput 7" VGA touchscreen

  4. #4
    Constant Bitrate Lazyflip's Avatar
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    Make sure the ground point has been sanded down to bare metal and the connection is makeing good contact.

  5. #5
    Constant Bitrate mbuchman's Avatar
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    Possible errors -
    - Short somewhere in the circuit (from speaker to amp)
    - not getting enough power
    - amp might not be stable at that ohm level
    - might need to lower the gain a little to better match the headunit

    Thats all I can think of right now

    Matt

  6. #6
    Maximum Bitrate boomintrac's Avatar
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    how is your sub wired?
    nevermind i saw 3ohm

  7. #7
    Maximum Bitrate boomintrac's Avatar
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    the 3ohm is where your prob is alpine amps dont like to see below 4ohms mono (unless it is a mono amp) you have a few choices to fix this you can run both coils in series will make a 12 ohm load drasticaly cutting power to the sub. use the rear channels to power the sub right side to one coil left side to another coil (if you do this make sure that you use a multimeter to make sure the output is the same on both channels)
    or you could just buy a dedicated sub amplike the alpine 501 which would match the 5 channel nicely

  8. #8
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    No, the alpine will handle 2 ohms just fine. I'm guessing your voltage is dropping out, below 10.5 or so will send it into protect. Hook up that multimeter to the power leads and have a friend turn it up until the amp cuts, check what the voltage is when that happens. If your electrical system can't handle it, you might need a new battery or a cap to keep it alive. That's a relatively powerful amp, and they aren't too efficient, so they need lots of power. Since the amp turns back on, I'll almost guarantee that it's a voltage protection, not a heat protection. Thermal shutdowns require the amp to reset, by turning the remote lead off and back on, plus the heat needs to dissipate.

    Only other idea is that the audiobomb sub might be shorting out a coil under high excursion, or touching the tinsel leads. Hook up your multimeter to the speaker leads, push the sub all the way in and all the way out, see if the coils ever short.

    Boomin track, both the first ideas are not very good advice, getting a sub amp makes sense, since it will put out much more power to that sub. But all of them defeat the purpose of buying a 5 channel amp, which was to run everything off of one amp.

    Dave

  9. #9
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    if you want to test what exactly is causing your problem, start disconnecting speakers one at a time, regardless of whether or not hte amp can handle the load. start by disconnecting the subwoofer fro the amp itself, leaving the sepakers hooked up. see if the amplifier goes into protect. you can work this way through until you have all your speakers disconnected. if it still goes into protect at a certain volume on the radio, then its time ot turn down the bass and treble boosts on the radio. If the amp still goes into protect, its time to test the am pon a bench, in someone elses car, anything to isolate the amp from your car and your charging system. And finally, if it still goes into protect after this, its time to get your amp repaired.

    isolate and identify!

  10. #10
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    What he said.

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