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Mtx jackhammer jh300

My amp powers on but will not power m subs I have a mtx jack hammer jh300. I used to work but something touched an it stopped is there some form of reset on the amp because it still powers up it just wont play mu subs

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  • 637 Answers

Try another set of speakers to see if that works. If so, it could be your subs. Also, check ohm reading on each sub.

Posted on Jun 18, 2014

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Posted on Jan 02, 2017

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  • 21 Answers

SOURCE: I'm having problems getting full power to my sub.

you can only bridge it if your amp is made for it......the only other way is to have another of the same amp.......tell me what you come up with

Posted on Mar 20, 2009

  • 36 Answers

SOURCE: mtx 1000xd led light is flashing and the subs will not work

The light flashing usually means there is a short somewhere. Check your wires to make sure there are no slices and are touching. Also check to make sure you have your remote wire hooked up.

Posted on Sep 21, 2009

  • 1 Answer

SOURCE: MTX Thunder 81001 wont push subs

first of all you should check the minimal impedance your amp handles , if is class d it should handle between 1-2 ohms total impedance in a mono conection , meaning whatever quantity of subs you have hooked to your amplifier,their total impedance should the minimum the amp handles that way all the power from your amplifier will be used.

Posted on Jan 23, 2010

kcarmax
  • 30 Answers

SOURCE: i have a mtx thunder 7801 and a sledge hammer box

Sounds like the subs are blown with the voicecoils fused together which means the amp is/was seeing a dead short ( zero Ohms reisitence) not good for any amp. Disconnect the speaker terminals from the amp and see if it turns on. The funny smell might have been the subs blowing up, i'll keep my fingers crossed for you.

Posted on Mar 01, 2010

  • 111 Answers

SOURCE: hi i have a mtx

The problem was caused by you trying to run a 2OHM load on an amplifier which is designed to run only on 4OHM when it is bridged, the amplifier is most definatley cooked. An authorized MTX technician should take a look at it, to determine just how wide spread the damage is.
dreamsystems.

Posted on Feb 11, 2011

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1 Answer

Any sub's I hook my mtx jackhammer jh1200 up to instantly are forced down and eventually fry. Why is my amp doing this?


This problem is caused by one or more of your output devices (FET, Transistor, or IC) is shorted and causing the power rail to be connect through your speaker. Your amp boosts the 12v supply to a much higher +/- voltage rail which powers the amp's outputs. When the amp is shorted or overheated to a point of destruction you can end up with this problem.

It will need to be repaired by a technician.

Mar 03, 2015 | MTX Car Audio & Video

3 Answers

My mtx JH300 amp is going in to protection mode what should i do?


have you checked the amp fuse ? also never connect while battery is connected. be sure to connect the amp to amp specs as stated in user manual i had the same problem and it was as simple as a missed connection however it could be a multitude of isues causeing the problem most of which are in the user manual. also check the earthing cable is hooked up and be sure no power supply is earthing out on the car. Protection mode is generaly activated when the amp isnt connected properly or by fault of power supply. double check evenrything and check again.

Nov 15, 2011 | MTX JackHammer JH300 Car Audio Amplifier

1 Answer

Stopped working suddenly. No PF lights, no smell. Power light turns on sometimes. Fan turns on. Wired properly. No power to sub/subs.


check the fuse holder an the power holder on the inside of the amp an just to see check ur ground some time they lossen

Jun 21, 2011 | MTX JackHammer JH600 Car Audio Amplifier

1 Answer

My MTX Jack Hammer JH300 Amplifier is warming up... A red led indicates that the amplifier is warming up.I checked the conections and everything seems to be ok, I've a 10" Jack Hammer JH 4510 Sub...


Check the speaker connections from the amp to the box and inside the box to the sub. Its possible these came loose from vibration. Also gently push in on the sub. It should move freely and feel spongy. If it drags or is stiff the sub may be bad. Use an Ohm meter and test the sub. There is an Ohm rating on the sub (usually 4) and it should be close to that. Also check the audio in. Maybe the amp/sub combo is fine but there is no sound going in. Use an MP3 player with a 3.5MM to 2M RCA cable as an input. Start with the volume all the way down and SLOWLY raise the MP3 volume.
Please Rate!

Apr 28, 2011 | MTX JackHammer JH300 Car Audio Amplifier

2 Answers

Amp is all hooked up and installed but sub is not making a sound. Problem with sub or amp?


Disconnect all speaker connections and rca cables. Leave power, ground and remote wires intact. Try turning on again. If you still have a protection light your amp is faulty. Double check all connections. GOOD LUCK. A thumbs up would be greatly appreciated if this answer is helpful to you. Worth fixing.
amp-all-hooked-up-installed-but-sub-not-flhv0giodkaywsjitcb2uyf1-2-0.jpg

Dec 01, 2010 | MTX JackHammer JH300 Car Audio Amplifier

1 Answer

I installed the MTX Audio JackHammer JH300 600W, Class D in my truck. Powering two alpine type-s 10' subs. Im using a 50a fuse at the battery. 8 gauge B and ground. I had the subs working went for a drive...


Your amp should not have a 50 amp fuse at the battery. It puts out 300 watts RMS (continuous power). The fuse at your battery should match the one that is on the amp itself. Your amp is overheating and there is a fault, possibly your speakers are wired to present too low of an impedance to your amp. Disconnect them from your amp, and use an ohmmeter/multimeter and measure the resistance load. It should not be lower than roughly 2 ohms. Depending on whether you bought dual 2 ohm or dual 4 ohm subs, that could be the heart of your problem.

If you bought D2 subs, you can get a 4 ohm load per sub with each sub's voice coils in series, and then parallel them together to get a 2 ohm load at the amp, which is perfect for your amp. Or you can wire each sub's voice coils in parallel, so that they're 1 ohm each, and then series them together at the amp for a 2 ohm load. The first method is simpler. Be sure that you haven't wired each voice coil in parallel (1 ohm per sub), and THEN also wired both subs in parallel to the amp (1/2 ohm load). That would definitely send your amp into protection mode, probably before it would have a chance to overheat. This is another reason why you should not have used a 50 amp fuse under the hood. If for whatever reason, the fuse on your amp doesn't blow, the amp is getting way too much current for it to handle, because of that 50 amp fuse under the hood.

If you bought D4 subs, you have a problem. If you've wired each sub's coils in parallel (2 ohm per sub) and then wired both subs together in parallel at the amp (1 ohm load) you're presenting too low of a load to your amp. Again, this will overheat your amp and send it into protection mode, both of which are what you're seeing. You never want to have two D4 subs with an amp that only handles 2 ohms, because you can't get a 2 ohm load with two D4s. You're stuck with 4 ohms or 1 ohm. 4 ohms cuts your amp power in half, 1 ohm cuts it off completely.

If you know for sure which way you've wired them, then you now have the information to tell you whether you've done it incorrectly or not. If you're not sure, first disconnect your subs and measure the resistance as I described in the first paragraph. If your amp is seeing a 1 ohm or 1/2 ohm load, there's your problem. If you see a 2 ohm load (subs are wired correctly after all) then you may have a bad ground connection, or your amp is bad and needs to be serviced/replaced.

Nov 15, 2017 | MTX JackHammer JH300 Car Audio Amplifier

1 Answer

I have a mtx thunder 7801 and a sledge hammer box


Sounds like the subs are blown with the voicecoils fused together which means the amp is/was seeing a dead short ( zero Ohms reisitence) not good for any amp. Disconnect the speaker terminals from the amp and see if it turns on. The funny smell might have been the subs blowing up, i'll keep my fingers crossed for you.

Feb 28, 2010 | MTX Car Audio & Video

1 Answer

I have an MTX Jackhammer 600. I just took out my subs, replaced them with new subs with the same parameters in the same box and they have low volume and distortion. The only wires unhooked were the speaker...


Hi,
If you replace the speakers with the power on, then you probably burn the output transistors in you Amplifier, if that is the case you have to take it to a repairshop, there is nothing you can do to fix it.

If that`s not it, then try this, make sure the power is off, unplug the wires from one sub and switch them, for instance put the red wire where the black one was and visa versa, leave the other sub alone.
If this does not work put the wires the way they were. Hope this helps. good luck

Dec 19, 2009 | MTX JackHammer JH600 Car Audio Amplifier

1 Answer

The light that has the lightning icon keeps blinking continous. what could be the problem


Hello djmalibu77,

You do not say if the amp has been installed and working properly for some time or if the problem began immediately upon installation.

If the amp was just installed, I'd suspect a wiring problem. Either a faulty ground or too low of an impedance.

If the amp has bee working properly and the problem just started, I'd start by removing all connections except ground, power, and remote and see if the amp powers up properly. If it does, reconnect the wiring one at a time to determine where the faulty wire or component is located. A grounded or shorted input, shorted voice coil, or a short or ground in the output wiring will cause an amp to go into protection. If these all check out, it's probably a fault in the amp itself.

Hope this helps.

Oct 31, 2009 | MTX JackHammer JH300 Car Audio Amplifier

1 Answer

Mtx 1000xd led light is flashing and the subs will not work


The light flashing usually means there is a short somewhere. Check your wires to make sure there are no slices and are touching. Also check to make sure you have your remote wire hooked up.

Sep 19, 2009 | MTX X Thunder 1000XD Car Amp

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