Question about Jensen LXA400 Car Audio Amplifier

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My amp keeps going into protective mode.

I just bought this amp and hooked it up to my two rear speakers (pioneer 6.5's 160w each)...when i have the gain setting on minimum and my deck volume below about 16, the sound comes through the speakers just fine, but the minute i turn the volume up on my deck past 16 or so, the amp turns to protective mode and the sound stops coming through on my speakers. the amp is not overheating at all and i have played around with the settings trying to see if i can get it to play any louder than 16 (which is very quiet). Any ideas what the problem could be? thanks

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  • Anonymous Dec 15, 2007

    dude i feel your pain, i have two pioneer 6*9s hooked to a jensen 650 watt mono amp. if i have my volume below like 10 (on a 32 max) cd player it plays. once i go over it goes into protect. i'm about to try different wiring method hoping lowering ohms will boost performance. best of luck bro peace

  • awb101 Dec 16, 2007

    i have a jensen lxa600 600 watt amp i cant get it out of protect mode. ive tried lots of different things ive moved the ground lots of times. any help would be great

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Try to lower the SLA option on ur deck maybe the amp is pulling to much current from the battery try putting a battery with more AMPS

Posted on Jan 31, 2006

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1 Answer

Speakers cutting in and out at high volume


The amp is going into protect on the two channels powering the speakers. Turn down the gain on those two channels. You also may want to consider crossing over the speakers a little higher than they are now.

The rating on those speakers are way too high. 6.5's and 6x9's will take 50-100 clean watts tops before they start to break up.

The best solution to get it perfect is....unplug the subs. Turn the gain on the speaker channels all the way down. Then turn up the deck 80% as high as it will go. Play a song. Then increase the gain on the amp until the speakers are as load as they go without distortion. Shut off the car, replugg in the subs and do the same thing. Gain on sub channels all the way down, deck then to 80%, find a bass heavy song, then turn gain up until subs become distorted. If you do this procedure your speakers and subs will be "gain matched" to the proper levels.

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If you set the gain too high on the AMP, at loud volume levels some clipping or distortion of the output signal will occur. Most amps have a Circuit inside that detects this clipping or distortion and applies protection to prevent damage to the speakers and the amp. It would help to know if you are driving the speakers with a Line level output or using the speaker output from your deck. There are many things that can cause an amp to go into protect mode, and knowing a little more about your setup will help to solve the problem.

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