Question about JVC KS-AX704 Car Audio Amplifier

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Output cycles in and out. Amp runs extremely hot

Just recently the amp's output tends to come in and out. 2 seconds on...2 seconds off... and so on. Giving it a slight tap tends to fix the problem temporarily until vibration knocks it out of whack. I checked all the connections; everything looks good. Appears to be an internal problem as the amp runs very, very hot to the touch.

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Sounds like you have a bad solder connection somewhere inside the your amplifier. I would carefully open it up and check for lose parts (resistors, transistors, capacitors, diodes, etc). It is not that difficult to do. Once you find the lose part, solder it into plce with a liberal amount of solder. That should solve your problem.

Posted on Jul 17, 2008

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Posted on Jan 02, 2017

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So i have installed my amp, epicenter, all wiring is done, hace great ground.. But once i turn my car on to sound check everything starts fine but after turning up the volume a bit.. My amo goes into...


It sounds like you have your gain to high. best way to solve this is by turning the gain way down to - or lowest number , then turn everything on and upto the volume you desire, then slowly up the gain. also avoid using bass boost, I agree it sounds great but it puts strain on the amp and shortens life in the amp. with the bass boost off, you can adjust others (not the gain) to get bass.

Hope this helps

Jan 26, 2013 | Car Audio & Video

1 Answer

I just bought two rockford fosgate t1 twelves duel voice coil 4ohm I'm running a old school alpine v12 1507 mrv 2channel. I want to bridge the amp to get the most out of these subs would it be better...


Hi there,
This amp should run comfortable at 2 ohms/channel. However, your dual voice coil subs are rated at 4 ohms. This means when you connect the 2 voice coils together in parellel (positive to positive and negative to negative both coils wired to one output) the amp will see 2 ohms. So if you connect both subs to one output then your amp will see 1 ohm (not good) If you run the voice coils in parellel but the subs in series then the 2 resistances (ohms) will be added together. So that way the amp will se 4 ohms. This is fine but the amp would push more power into 2 ohms. You can run one sub on each channel if you can split the head unit output to 2 outputs, problem is then you will be halving the amount of power to each channel. Personally I would probably be more inclined to run 1 sub on this amp and run another amp from the pre-outs on the first amp for the 2nd sub. Try to find another amp the same to run the second sub. Mind you, 2 of these amps will need some big power cable to run them but should shake your teeth out!
Hope this helps

May 08, 2011 | Alpine Car Audio & Video

1 Answer

I have Peavey Bass amp TNT 115 combo it is 5 to 6 years old.. Recently, while playing on the stage the output went off.... and the amp is receiving the input signals but cannot get the output!!! Please...


Have you tried to open , if so does it have protection fuses or if are they still good
Does it have a fault protection indicators like leds if so

If the above don't apply check the output device but first comfirm that both vee a vcc is reaching the output devices

Dec 06, 2010 | Peavey AMPLIFIER, 1000 WPC, DDT, 8/4/2...

1 Answer

My amp goes into protection mode when i turn on my car. It gets hot too. I had 2 kicker 12" l5's and blew the subs with that amp, could i just have a simple problem with the amp? What are all my options?


Protection LED on, no output? Amplifi er is very hot = thermal protection is engaged. Test for proper
impedance at the speaker terminals with a VOM meter (see the diagrams in this manual for minimum
recommended impedance and multiple speaker wiring suggestions). Also check for adequate airfl ow around
the amplifi er. Amplifi er shuts down only while vehicle is running = voltage protection circuitry is engaged.
Voltage to the amplifi er is not within the 10–16 volt operating range. Have the vehicle’s charging and electrical
system inspected. Amplifi er will only play at low volume levels = short circuit protection is engaged. Check
for speaker wires shorted to each other or to the vehicle chassis. Check for damaged speakers or speaker(s)
operating below the minimum recommended impedance.
No or low output? Check the balance control on source unit Check the RCA (or speaker input) and
speaker output connections.

Jan 29, 2010 | Kicker ZX10001 Car Audio Amplifier

2 Answers

My amp gets really hot as soon as the power comes on. what does that mean


Check your speaker output cable and connector, they might have connected to body of car.
  1. Remove all input / output cable from amp
  2. Plug the power into amp.
  3. if still the amp is still heating.
  4. Check if any screw used to fix is not connected any part of the amp output or input point.

Jul 22, 2009 | Kenwood KAC-728S Car Audio Amplifier

1 Answer

How can i get this amp out of protection mode?


You have a short circuit. I don`t know this particular piece of equipment but you should check all the output transistors/chips. Try disconnecting ALL the supplies to ALL the output devices and switch on, It should fire up, If it does, reconnect the positive AND negative supplies to one channel. If it still fires up, reconnect the next channel until you find the faulty channel then you could try doing comparison checks between the bad channel one of the good ones. These amps tend to use MOSFETS and are extremely intolerant to bad or loose connections. I hope this helps. You`ll probably find that you`ve got poor wiring, That will be your original fault. Ensure you make ALL connections good and sound before reconnecting the amp up with new devices in or you WILL be back at square one with no amp again. Ian

Jul 19, 2009 | AudioBahn A8001DT Car Audio Amplifier

2 Answers

Boss 2500d gets hot and trips off and on every 5 mins...


If you are bridging the amp then you must DOUBLE the "ohms load" that is specified. I.E. If you need 4ohms per channel, then when bridged you would need 8ohms per bridged channel. If your load is indeed correct then you have a fried output probably. Try to run it without any speakers on it. If it still gets hot then you for sure have a fried amp. All the symptoms you decribe sound just like you have too much of an "ohms load" though.

Aug 01, 2007 | Boss Riot 2500D Car Audio Amplifier

1 Answer

No output


Have you tried turning up the vol/gain control? Are all the switches on the amp set for full spectrum output? Are you sure you are using the RCA input and not the RCA output jacks (if it has such)? Check all the switches to be sure they are in the "most default" position. Something you might try, is to make a jumper wire to temporarily jump from the audio input ground to the power supply (chassis of car) ground. If this makes it work then you have a input ground problem in the amp. Good luck. P.S. As for epoxying the trace down on your other amp. If the foil is still in good condition then it should be ok to epoxy it down. If it needs some "help" then do that first, then epoxy.

Jan 21, 2007 | Hifonics BX1000D Car Audio Amplifier

1 Answer

Speaker outputs blown on 4 channel amp


the outputs should be replaced in pairs, there are 2 to 4 pairs, but you sould only need 1 pair replaced. these transistors typically range between 10 to 30 cdn each + labour, look for 1 to 1.5h to replace & test the unit after repair. check your local repair shop for their rates. good luck

Nov 05, 2006 | Kenwood KAC-728S Car Audio Amplifier

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