Question about MTX Thunder 8302 Car Audio Amplifier

1 Answer

MTX 8302 sound just quit on front speakers

I have an MTX 81000D for subs MTX 8302 and 6500 hooked up to kenwood kdc-z919. The other da the sound was cutting out on ftront speakers then everything was ok. Three days later I was driving the sound started cutting out again a couple of times then finally everything up front quit. I still have some sund when you put your ear to the front speakers but they are drowned ot by subs and back deck speakers. The 8302 amp was really hot I noticed compared to the other ones. Could this amp be blown due to heat?? The led comes on but no amplification to the speakers that are hooked up to it?? I am not an expert though I didn't put this set up together a sound place did. Thanks Dan

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  • 5 more comments 
  • Daniel Champagne
    Daniel Champagne Aug 05, 2007

    Hi Chris!!

    No I didn't add any devices and its been running good for the last month at least.

    I went to check now that it was cooled down but it is the same!!
    It has been very hot around here this past week.






    This is what I have for set up

    Audio -Compustar2wss alarm/starter security system -Kenwood KDC-Z919 Headunit -Kenwood 10 disc Cd changer -1 x MTX mid-tweeter combo in doors -1 x MTX mid-tweeter combo custom made floor kick panel each side -4 x MTX 6.5" mids rear deck -1 set clarion tweeters in rer sides -2 x MTX 15" 8000 series subswoofers in trunk encased in custome made fiberglass box that drops in spare wheel well -1 x MTX 81000 D mono amp -1 x MTX8302 2 Channel amp -1 x MTX 6152 2 channel amp -1 x 2.4 farad capacitor -0 guage wiring


    Thanks

    Dan

  • Daniel Champagne
    Daniel Champagne Aug 06, 2007

    My volt guage reads 13.9 idle and 14.2 at rev

  • Daniel Champagne
    Daniel Champagne Aug 06, 2007

    I also run a 2.4 farad capacitor in the back

  • Daniel Champagne
    Daniel Champagne Aug 06, 2007

    Hi Chris

    I forgot to mention I installed a 180 amp alternator
    but that doesn't mean I'm not having those issues.
    I will do what you asked and let you know.
    The other problem now that developped today anfter I got the left side going
    the amp quit again and now its blowing fuses

    Thanks

    Dan

  • Daniel Champagne
    Daniel Champagne Aug 06, 2007

    The Capacotor is right next to the amps and there is a fuse between
    the cap and the battery
    The guage on the amp shows a constant 12.6 when the car is running and goes down when it is not.
    The other amps don't get hot at all
    The speakers on the right side were blown since they smelt burnt
    Removed and Tested wire with other speaker seemed ok
    then I re-hooked the left side everything was ok so I decided to do a test and run at 50% capacity, after about 10 min these speakers started to smell as well so I turned it down and soon after they quit as well.
    After some reaserch I saw that the 4 speaker which are 2-t8.5 and 2-t8.6 are 50/100 watts rms and 60/120 watts rms and 9the (4-tweeters)are probably too weak for this amp. The tweeters are ok though. So after all this I decided to disconnect that amp ant
    when I opened the trunk it was off and noticed blown fuses
    tried other fuse they blew as well in seconds

    everything in on 0 guage wire from the battery
    there is also a voodoo something i don't no wahat it is but i think it's a grounding block
    Do you think its an internal problem

    Thanks for all the help Chris


    Dan

    I was trying to upload pics for you but it's no working

  • Daniel Champagne
    Daniel Champagne Aug 06, 2007

    Hi Chris

    Thae voodoo is a distribution block

    Dan

  • Daniel Champagne
    Daniel Champagne Aug 06, 2007

    Hi Chris!!

    Sorry about the abreviation, I will type the hole thing next time.
    I will email the pics right now

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  • 84 Answers

Hi Dan....Have you had any other service or installs shortly prior to the onset of clipping? In any case, the 8302 has Onboard Thermal Protection which is kicking in due to excessive heat. If you've had this running fine for a period of time, by that I mean at least a month, then we need to focus on why you're suddenly overheating......please update your post with any further information and progress.....good luck my friend

Posted on Aug 05, 2007

  • 4 more comments 
  • V. Chris Suehiro
    V. Chris Suehiro Aug 05, 2007

    Hi Dan.....SHEESH..That's quite a rig ya got. Okay, besides impeccable equipment, you also have NO conflicts, which requires me to do a little more research, but off the top of my head we may need to replace your fet. Also, providing your installer is an authorized MTX dealer, you do have a 3 year warranty. Meanwhile, we have to start somewhere, so let's begin with the following steps.

    1) Ensure that your ignition and any after market accessory Power Switches that you may have are in the OFF position. Now check on the 8302 and ensure that the LED isn't lit.

    2) Until we know the exact corrective measure to apply, Decrease both Gains located on the left hand side of your amp by at least 50% for now. In any case, we know that the safety features of your amp are functioning properly, thus preserving the components. Please update your post with your observations and developments and I will do the same...good luck my friend

  • V. Chris Suehiro
    V. Chris Suehiro Aug 05, 2007

    One more thing I want to throw in for now. Let's make sure that your vehicle hasn't developed a voltage problem. While your vehicle is at flat idle, turn on your headlamps. If you have somebody at hand to check/watch for you, rev your engine, and have them look for changes in the brightness of your lamps. You could do this on your own if it's dark enough, and you're close enough to a wall.

  • V. Chris Suehiro
    V. Chris Suehiro Aug 06, 2007

    Hi Dan....okay..now we need to focus on your voltage/amperage issue. Until we get the source of our problem, I STRONGLY advise you to discontinue powering up any of your stereo equipment before we lose it all. Update me with any info. on the alternator such as make & complete model#, when was it installed, and was it professionally installed.....hang in there

  • V. Chris Suehiro
    V. Chris Suehiro Aug 06, 2007

    Again one more thing...is your capacitor "right up" next to the amp with HEAVY guage wiring?

  • V. Chris Suehiro
    V. Chris Suehiro Aug 06, 2007

    Sorry Dan...again one-one more thing...examine your capacitor and make sure that it isn't fused together, and let me know if there's a fuse between the capacitor and the battery, if so, that fuse is now likely "fused" as well. BE VERY CAREFUL around that capacitor, it's charged with an incredible amount of voltage and amperage, and will likely require discharging before anything else can be done by yourself....again, this is a very dangerous and volatile item my friend...please use extreme caution.

  • V. Chris Suehiro
    V. Chris Suehiro Aug 06, 2007

    Hi Dan...ok I'm caught up with your comments and will start crunching again. I'm glad you're taking proactive measures in protecting what you have, so you're actions are easing my fears. Please email the pics to chris2244746@yahoo.com and it'll be forwarded to my primary email. Also, the immediately replacement fuse is likely caused by the cap being "empty", and in the process of charging it, of course, there is no way it can handle that kind of current. Caps are usually taken off-line and pre-charged using a resistor, and that's when it becomes an explosive device.....trivia..."cap" wasn't originally coined as an abbeviation for capacitor...it was in reference to a Blasting Cap.

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