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.

Good Luck

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How to make a Pioneer vsx-816k/s last longer


I really don't recommend this product to anyone, or any newer pioneer products for that matter (except the elite line). This model has the "hybrid" design, which is a very flawed design. At first the speakers will start cutting in and out, and then some of them wont work at all, and then the receiver will flash "overload" and the receiver will go into a permanent protection, all because the receiver cant handle the resistance of the speakers(doesn't matter what speaker it is). Once in protect mode, press ENTER+ ADVANCED SURROUND and it will tell you what the problem is causing it to stay in protect mode. In order to keep this from happening, use external amps. Pioneer wants around 500 dollars to fix it if its out of warranty, it will cost at least 50 to fix it yourself, in most cases it will cost 150 to fix it yourself (most cases all 3 power modules will go out, or as pioneer calls them, power packs). If you have an older vsx model (50s-80s) then it is usually worth fixing. If your having problems with pioneer vsx 3600, 3700s, 3800, or 3900s, send me an email at Joshadk@embarqmail.com and i will help you the best i can

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When you remove boards, you may be breaking a circuit somewhere that is causing the shutdown. Pioneer uses rear panel jacks for ground points a lot, and if even one of these screws is out it can cause it to shut down.

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Guessing its the factory deck and it does not have rca outputs behind the deck .You get an adapter from speaker wires to rca with the gain setting on it from a car audio shop ,wire up you amplifier and connect the speaker wires to rca adapter from the closest speaker wires to the amplifier placement leaving the car speaker still connected though ( just tap into the speaker wires ) .Connect the rca from amp to adapter and set the gains on the adapter and you ready to play .

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1 Answer

I had these 12in pioneer subs so I went and bought the new Rockford Fosgate they came out like a week ago my problem is every time i hook them up to the amp the protection red light turns on can you...


if the amps impedance is higher than the speaker, it will trigger the protection circuits, because the amp sees it as an overload, example the amp has 8 ohm impedance specified, and your speaker has 4 ohm specification, that is a clear overload. Bring the subs back to the amp's dealer and have the amp replaced; the one that matches your subs. Hope this helps... ;-)

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1 Answer

As soon as I hook the amp up it goes into protection mode. But in about 10 seconds it flashes off protection mode but them goes right back into protection mode. And it keeps doing this as long as the amp...


If you disconnect your speakers and input and the problems remain it means you've blown your end-stage and the amp needs repair.

if the problem disappears when disconnecting the speakers you may want to check if the impedance of your speakers is within tolerance of the amp.

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That is a good thing, your receiver is going into "protect mode" that means the receiver is shutting down to keep from damaging delicate internal circuitry, it is sensing a speaker bottoming out or some other electrical "short" that could be damaging!
Also could be from over driveing the amp and then it starts to overheat thus going into "protect mode".
If your speakers are "clipping or distorting" turn it down, you are going to ruin your amp. Good luck !

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My speakers shut off at high volume and I have to turn the unit off to get them to function again. What's wrong with my head deck? It's a Pioneer deh-p3100 and I've heard of someone else having the same...


Check speaker wires for short or touching. Try unhooking one speaker at a time then try it. If it doesnt do it on one that speaker/wiring is your pulprit.

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check your amp and speakers and make sure their both hooked up 4 ohm instead of 2 ohm because if you have 1 set of voice coils on your speakers they can only be hooked up four ohm and not bridged to your amp because if you keep trying this you will lock up your speakers if the speakers are only 4 ohm than just hook them up regular to each channel on your amp if your trying to brigde four ohm speakers to your amp it will keep going into protect or worst case scenario you will fry your speakers and you can check your ohm with a ohmmeter trust me my brother owns a stereo shop

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