Question about Alpine MRV-F345 Car Audio Amplifier

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Have 2 amps, 1 for subs, other for speakers. The one for speakers just started shutting off

If I turn the volume up past half it shuts down and when I turn key off it resets and works till volume is raised again

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  • chandler21 Oct 11, 2007

    amps are not identical other is a kenwood and it works fine,as did the alpine until recently

  • chandler21 Oct 12, 2007

    4 speakers,boston acoustics in front, pioneers in rear. both 6x8 both coaxials. dont know about the v/c being in series or parallel. they connect to the amp by placing wire in to a hole and tightening a set screw, the power, ground and remote wires also connect that way




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This can be caused by too low of an ohm load, such as wiring subs in parallel at lower ohms than amp recommends. Or short speaker to body of car can cause it, or amp could have an internal problem. Like stated above try each speaker or disconnect one at a time to see if it is a speaker/wiring doing it. If amp gets too hot can also do it, but often it is overcurrent in the amp if it does it with high volume. Another less common issue could be lack of power so amp is drawing voltage too low for it to run, like if your fuse/wiring has a bad spot cutting down current or is not large enough/corroded/bad ground/etc.

Posted on Apr 22, 2008

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Are the amplifiers identical?


Do both amps shut off?

Posted on Oct 11, 2007

  • Perry Babin Oct 11, 2007

    The MRV-F345 is a 4 channel amp. How do you have the speaker(s) connected to it?


    How many speakers?


    Number of voice coils per speaker?


    Rated impedance per voice coil?


    If DVC, are the coils wired in series or parallel?

  • Perry Babin Oct 12, 2007

    Disconnect all of the speakers and turn up the volume to the point where it would normally shut off. If it doesn't shut off, reconnect one speaker at a time to see if any single speaker makes it shut off. If the first speaker causes the amp to shut down, try a different speaker on that channel. If you find that one speaker causes the amp to shut down, inspect the wiring for that speaker.





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Well i was driving one day and my subs just whent out so i bought brand new wires and hooked everything up but the power protector light turns red whenever uu turn it up past volume 10 i really do not know...

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