Question about Planet Audio VX4002 Car Audio Amplifier

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Vx4004 i have just bought a vx4004 amp that has just been refublished, had it installed for a week and now the protection light is on, iv reset the speaker and the power wires but still on could anyone tell me what electrical fault it could have and how to fix please.

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  • the_matrix20 Aug 22, 2008

    all i had wired to this amp was front door speakers (4ohms) each to two channles, then 2x 6x9's in parallel (4ohms) on the third channel and the same on the forth, iv tried disconnecting the speakers but the protection light is still on

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The red protection light still cimes on what should i do

Posted on Jun 05, 2010

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More than likely, your speakers are wired up in such a manner that they are creating more resistance than what the amp can handle. That's usually what puts amps into protect mode.

Car speakers should be 8ohm's resistance, but if you're bridging and running a dual voice-coil sub or two subs in series... you could have inadvertedly wired it up so the amp is seeing 4 or 16 ohms of resistance? (depending on which way you went)

Try removing the speaker wire completely, then turn the amp/car on and see if it still goes into protect.

Posted on Aug 22, 2008

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I bought this BT330 and it was working fine for a week, now it will turn on for 5 seconds and automatic turn off. I understand the unit is trying to protect overflow power but the system was not even hot....


Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

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Poly Switch
All full-range loudspeakers are fitted with a self-resetting
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