Question about Jensen JXP340 Car Audio Amplifier

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Amp wont work jxp340

The amp is hooked up properly and the power light comes on (green)but there is nothing going to the subs, is there anything i can test or check for inside the amp???

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Re: amp wont work jxp340

Hi if you got a voltmeter TEST IT ALL ON A LOW LEVEL OF VOLUME!! check the outlets of the amp if there is a signal at all... no? - the amp isnt hooked properly! yes? - check if the volt level on the outlets is higher then the level on the inlets of the amp (the amp is amplifying) no? - the amp isnt hooked properly! or its bad... yes? - connect a speaker to see if its working wont put out a lousy spark? check your system, the problem if probably there... check all the connections, fuses, wires begin from battery and go FWD antill the next device isnt working good luck

Posted on Feb 23, 2006

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Did you check the fuses? If they are (Blowin) Condensation will not harm a car amp.It is normal to have condensation on a car amp,When it is cold out. I have been installing car audio Equipment for over 40 years ,End never seen a amp that was damaged buy condensation on it.

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Can i use my jensen jxp340 amp with my one 800watt 12" 4 ohm subwoofer?

Yes, technically you can, however you will be putting both your sub and your amp at risk. One of the worst things you can do to a sub is underpower it. The easiest way to explain it is n ot giving enough power to the sub leaves it starving for power. The motor structure ends up working too hard to try and move the cone properly and what happens is the sub will usually seize up rather than blowing out in the term you usually hear (ie, I had my system cranked up and I blew my subwoofer).

Secondly, in an attempt to get any real sound out of the under powered sub, you'll probably end up cranking the gain and bass boost on the amp which ends up overworking the amplifier quite a bit and can in turn lead to fried out amp chips, burnt up circuit boards etc.

Thirdly, by maxing the gain bass boost you're going to end sending a lot of distortion through your subwoofer in an attempt to get some decent bass. Distortion kills both subwoofers and speakers alike.

So to answer your question, yes you can hook up your subwoofer to that amp and yes, it will probably play for a while but I wouldn't recommend it. Look for a class d or mono block amp to push your sub as these will give you the most power and best heat dissipation. They are designed to push subwoofers specifically and you will get better sound and longer life out of your equipment. A good rule of thumb is look for an amp within 100-150 watts of both your RMS power handling and your Peak power. Remember, when it doubt, always go a little bigger on the amp side of the spectrum. It's easy to "tune down" an amp by having the gain and bass boost at a lower level (50%, 25% etc), than to turn 'em all the way up just to get some bass and end up prematurely blowing out your sub, amp or even worse, both.

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It sounds like you need to ask for pro help mate, mybe the amp just needs setting properly, Is the amp on bypass for bass, or does the amp run the complete system

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