Question about Kicker KX300.4 Car Audio Amplifier

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My protection light won't shut off on my kicker kx300.4 car amp

Being how the protection light won't shut off the amp won't power up

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  • 16 Answers

Ground loose or unsecure...bare wires touching?

Posted on Jul 03, 2009

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Kicker kx850.4 protection light stays on know power light


Check power make sure you have solid 12 volts. Disconnect speakers, shorted speaker can cause protection mode to engage. If still in protect mode will need to repair. Kicker does out of warranty repairs on kx series amps or try T.I.P.S contact at linearpower.com. Iirc Ray @ tips was one of the engineers at kicker back when kx series was introduced.

Jul 19, 2016 | Kicker Car Audio & Video

1 Answer

Kicker protection light won't shut off


Hello newwithtech,

There are 4 possible causes for the amp to go into protection mode. Kicker calls it SORT for Short, Overvoltage, Reverse polarity, and Thermal. If the amp has been in and working properly, it's probably not reverse polarity. And if it goes immediately into protection when power is connected, I'd rule out thermal. So it's probably either a short or overvoltage.

1) Start by removing the speaker wires and see if the amp powers up properly. If it does, one or more of the speakers is shorted or grounded.

2) Test each pair of wires with a multimeter set to the lowest resistance (ohms) scale. Measure across each pair and from each individual wire to ground. Across each pair, the meter should read about 3-4 ohms. From each individual wire to ground, it should read infinity. If the meter reads "0" ohms (shorted) in any test, you have located the problem.

3) If the speaker wires test OK, set the meter to read DC volts and measure the voltage at the amp positive terminal. If the voltage is higher than 16V or lower than 9V, you've located the problem.

4) If the voltage is OK, remove the RCA inputs and test for proper power up. If it powers up without going into protection, you have a shorted/grounded input. Replace them one at a time to determine which one(s) is/are defective and replace the cable.

If these tests show all the wiring is good and the voltage is OK, the amp is probably shorted internally (most likely an output MOSFET), and requires service at the component level. You need to take it to your local audio shop or send it to Kicker for repair.

Hope this helps.

Jun 29, 2009 | Kicker KX300.4 Car Audio Amplifier

1 Answer

Capacitor shuts off


HI DUDE UR CAR BAT NEED TO B CHANGE PLUS UR ALTERNATOR IS GOING TO FAIL SOON ... THATS ALL ... IF U ARE USING NOW IT MAYBE COZ LOTS OF PROBLEM TO CAPICATOR

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Kicker kx 800.4


Generally, if a Kicker amp has the power light lit and the protection light isn't lit, it's working. Are you sure that you have signal feeding the amp?

Are you sure your speakers are OK?

Nov 04, 2008 | Kicker KX800.2 Car Audio Amplifier

1 Answer

Protection light is on


Disconnect all speaker wires and signal cables from the amp. If it powers up, the wiring needs to be checked. If it still shuts down, the amp likely has blown output transistors.

Dec 26, 2007 | Kicker KX600.1 Car Audio Amplifier

1 Answer

Amplifier wont turn on.


Generally, when an amplifier goes into protection when you attempt to power it up, it means that the output transistors have failed.

Measure the DC voltage across the B+ and ground terminals as well as across remote and ground. If you have less than 11 volts when the amp tries to power up, the amp could be shutting down due to low voltage.

If the voltage remains near or above 12v, disconnect all speaker wires and signal cables from the amp. If it powers up, the wiring needs to be checked. If it still shuts down, the amp likely has blown output transistors.

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