Question about Jensen LXA400 Car Audio Amplifier

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Jensen LXA400 I have had this amp for approximatly 3 years. All of a sudden it will not play any sound. The Amp powers up; the Jensen sign is illuminated as well as the power light. THe protect light remains off. IT powers up and remains on but doesnt play. I know its not a stereo wiring problem because I have a mono amp which the wire pass through the jensen to get to the mono and the mono is still pumping the subs. If the amp done for?

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Re: Jensen LXA400

I have this same amplifier. I have noticed several ways it will "not work" during my ownership of it. I have it connected to a seperate battery to save my alternator, battery, etc as it is a power hungry beast for how low the output wattage is. Test the input voltage to see if you have enough, one way to see this is to check the "jensen" emblem that lights up. If you dont have enough power it will appear dim and only the right side lights up. Also the amplifier will not work if your speakers are "blown" even a little bit. Ive taken speakers that wont work on my lxa400 and connected them to a higher power amp and they will work (although they will sound horrible) If youre smart you will keep the gain under 3/4 on this amp, I see some people have found out the hard way that full gain fries the amplifier circuitry. Not an expert on electronics but it smells somewhat like melting glue or plastic. Ive noticed a lot of people have problems with the RCA jacks as well. There are 8 jacks, in two clusters. The first one is A+B and the second is C+D. Note: You do not NEED Y connectors on this amp! Connect your output rcas from the deck to top left and bottom left jacks of the left cluster. This will give you left and right (a+b) output from the first set of speaker outs. Then connect an rca patch cord from the top right and bottom right jacks of the first cluster and connect the other end to the top left and bottom left of the second cluster. This will give you output from the second set of speaker outs. Remember that this is in 4 channel mode. I dont remember the set ups for 3 channel but two channel I believe is the left deck rca goes to top left of the first cluster and the right deck rca goes to the top left of the second cluster. Then you just wire the speaker outs according to the picture on the amplifier. something like this: _________________________ |(+) - (-) +| ~~~~~~~~~~~~~~~~~~~~~~~~~ Speaker + goes to (+) and speaker - goes to (-) Also addressing another issue if you want to increase the wattage to your speakers you just use a lower resistance speaker (2ohm instead of 4) I would not recommend using anything over 4 ohms. As for the high level inputs, I dont recommend using them unless you have the plugs that go with them, its a lot easier to wire your deck rears to a line converter (changes straight speaker wire to RCA jacks) or to just buy a new deck with RCA outs. Last item, common knowledge: 400 watts does NOT mean 400 watts!!! This amplifier puts out very little actual wattage (50 or 83 per channel depending on the load) Hope all this helps someone out there.. Anyone who knows the 3 channel setups I would appreciate it.

Posted on Jul 15, 2007

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2 Answers

How do i bridge all 4 channels on the jensen 400 watt 4 channel lxa amp ?

  • This amp is not "bridgeable" at all. You will either blow the front end or blow the low end voice coil in your sub.

Regards, Tony

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Have Power going to the amp. Amp does not turn on. Do i need a remote? Bought vehicle with amp in it. Lxa 600 Power light does not turn on.

ok remote does not mean the clicker to ur tv its the wire that leads from the back of ur deck to the amp itself to tell the amp when its cool to turn on n off either blue or blue n white is the remote wire on the back of ur sterio run it to remote term. on amp n c what happens

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I need a wiring diagram for the jensen lxa400. Pushing 2 kenwood 6x9 (200 watt rms each) and 2 dual voice coil 12's (300 watt rms each) in a truck box. Everything is 4 ohm. Thanks, Curtis

you shouldn't need a diagram all you need is these items here.

purchase a 4gauge wiring kit

run a a power line from battery to amp with a in line fuse 6in from battery.

run a ground from car frame to amp. ( scratch paint and screw it down with an eyelet for good contact)

run a remote from radio to amp.(blue wire)

run rca's from the radio to the amp ( sub input on back of radio)

finally connect your speakers.

Mar 26, 2010 | Jensen LXA400 Car Audio Amplifier

1 Answer

Have Power going to the amp. Amp does not turn on. Do i need a remote? Bought vehicle with amp in it. LXA 600 Power light does not turn on.

you need to make sure you have 5 things.

1. power connection to the battery/amp
2. make sure you have a remote line radio/amp
3. make sure you have rca's radio/amp
4. make sure you have a ground amp/car frame ( scratch paint away for good contact)
5. make sure the speakers are connected to the radio.

if all is ok then check the inline fuse from the hot wire from the battery is not blown and the fuse on the amp is not blown.if so replace them. with the proper amp fuse.

Mar 24, 2010 | Jensen LXA400 Car Audio Amplifier

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Wiring diagram for a LXA400 Jensen power amplifier??

Power wire to battery
Ground wire to body of car
Remote wire to power antennea wire on radio or power amp wire on radio if you have aftermarket radio
get back with me for any more ?'s

Jun 05, 2009 | Jensen LXA400 Car Audio Amplifier

1 Answer

400 watt jensen amp not hitting.

Not to be mean but jensens have never hit as far as i know

Jan 29, 2009 | Jensen LXA400 Car Audio Amplifier

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Jensen LXA400 Fuse Size and RCA hook up for 2 channel mode?

take it to a stereo shop. there are variables you may not be aware of when hooking up speakers to an amplifier like ohms, very important!

Dec 08, 2008 | Jensen LXA400 Car Audio Amplifier

1 Answer

My amp keeps going into protective mode.

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

Jan 06, 2006 | Jensen LXA400 Car Audio Amplifier

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