Question about Visonik V408XT 250W x 2 Car Amp Car Audio Amplifier

3 Answers

Visonik 2-ch amp getting too hot and shutting down

I just purchased a Visonik V408XT. I have hooked it up to an MTX Sledgehammer box with 3 - 10" Thunder 4500 subwoofers. The box is wired up to one channel at 4 ohms. It has an RMS rating of 635 watts.

I purchased this amp because the bridged power is 800 X 1 @ 4ohms. What I was told is - using an amp that pushes more power than the RMS power of your subwoofers was a good thing. I was told that by doing this, it would eliminate the amp "overheating" because it could "push more, but didn't have to work so hard, which in turn would not overheat the amp". I had this set up installed by circuit city.

I do not have the gains turned up to the max at this point. Currently, they are about halfway. I have used 4 gauge wiring from the battery to a 1.2 farad Tsunami capacitor. (The capacitor is usually between 12.1 & 13+ volts) From the capacitor I have 8 gauge wiring powering the amps. (I also have a Visonik 204XT 4-ch amp that is running the components and coaxials, and it seems fine) I have 4 gauge ground wire as well, with 8 gauge ground wire routed through the capacitor to the amps. Looking at it, the ground doesn’t seem to be very good. They grounded it to a spot in the trunk, but it doesn’t look like they removed hardly any paint from the spot they grounded at? I’m not sure if that makes a difference?

My problems that I am having are –
1. The amp gets EXTREMELY hot after about 20 minutes of continuous play?
2. When I am listening to it at any level, I hear a popping noise or a flicker noise when I push the button to roll down my car windows. Or if I push the sunroof button, to open that, it affects the amp. It also makes a noise if I hit the power door locks button.
3. When I turn on my car, the sub amp makes a sudden “thump” noise? As if a sudden jolt of music is going through it? (but nothing is on yet, no music playing or anything) Its like it happens when it powers up or something?

I hope I have provided enough info to hopefully get my questions answered. I don’t want to have to take my car back to the shop if it’s a simple fix?

Thanks so much!!

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Re: Visonik 2-ch amp getting too hot and shutting down

I have the same amp that i just bought but mine dont do that. do you ever think that youu are a dumbshit and didnt know what the ******** were doing.

Posted on Jul 23, 2009

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Re: Visonik 2-ch amp getting too hot and shutting down

1) Visonik= ewww... i had a kit of theese and ew. i tried to call em, email them and notthiiing ever worked.
2) amp needs its space.
3) try little fans.. u can search in audio stores, they are arround 6 bucks each. not any fan, but AMP fans.
4)check rca's. ur power and rca cant be in same side.
5) seek profesional install if it doesnt help out..

Posted on May 24, 2008

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Re: Visonik 2-ch amp getting too hot and shutting down

First i have to ask if you ran the rcas on the same side as you did your power wires. that would result in the interference you're recieving. the rcas should be on one side of the vehicle and the power wires on the other. if you're unsure of the grounding site then take the time to properly clean it and reinstall. also understand that you amp having adequate breathing room is very important. without enough airspace your amp will surely overheat.

Posted on Dec 05, 2007

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SOURCE: confused

Hi jimmyjames,


How do you have the wires hooked from the sony reciever to the inputs on the mtx? 

 Sounds like your Remote wire is way too big. it should be 14 guage.  It only sends a low voltage low amp signal.


Another thing that could be messing up the sounds is the routing of the wires.  you should have the power supply wires separate from the Audiop signal wiring.  Power should run down the Driver side and Audio down the passenger side.


When you answer I may be able to tell you more.


Posted on Oct 19, 2007

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SOURCE: Schematic for MTX Blue Thunder Pro 752 amplifier

hello ..try this a bit of working out how to get them .when you do .you have to download bitzipper (these are a rar file)...then adobe 8 ..bitzipper can convert to a pdf flie so you can read them...hope you have some luck

Posted on Feb 12, 2008

  • 84 Answers

SOURCE: mtx thunder 304 4ch red amp light comes on but no audio

if the lights on and there is no sound it's either a cd player issue or your rca issue or the inputs for rca's on the amp are no good. or you have your subs wired at a wrong load to your amp and it is in a constant protection to avoid burning up.

Posted on Jun 14, 2009

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2 Answers


From the specs this amp can only handle 4ohms when bridged but can handle 2ohms when it's not bridged

  • Continuous Power (20Hz-20kHz, 0.04% THD)
    • 2 ch: (4 Ohm) 100Wx2
    • 2 ch: (2 Ohm) 200Wx2
    • 1 ch: (4 Ohm) 400Wx1
  • Maximum Power (EIAJ)
    • 2 ch: (4 Ohm) 250Wx2
    • 1 ch: (4 Ohm) 750Wx1
  • Frequency Response: 10Hz - 50kHz (0,-1dB)
  • Total Harmonic Distortion: <0.01% (1kHz, 4 Ohm)
  • Signal-to-Noise Ratio: >105dB (IHF-A Weighted, at 1kHz)
  • Dimensions: 10-3/8" x 2-1/2" x 13-5/8"
Hope that helps.

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Mtx thunder 6152 is getting way to hot and shuts its self off when it get really hot

okay, first thing i would do is turn down your gain. Sounds like you are over working the amp thats wire your amp gets hot and shut off, it's going into protection mode. Is your amp enough for your subs. Some times not getting enough power to your amp might do this too. But if your subs wattage is way over your amp watts, you need to upgrade your amp. Also check your subs and see how the are wired up with the ohms, And see if your amp can take a 1 ohm stable load or how ever it's wired up at. hope this was helpfull.

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Can you help with my wiring?

The more amp you are pushing the better. Better too much amp then not enough. How many watts per speaker? less then the amp I hope. When you need decibles the more air you push the louder it will be. Enclose in a MDFB enclosure or plexiglass and feed towards each other and port the box to the sides. This will cause some annoyance. We ran 2 rockforts @1000 watts and abtained 137dc before the back windshield blow out,,lol

Mar 09, 2010 | MTX 6001 Car Audio Amplifier

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I have 4/3/2 ch. alpine f-240 amp- i want to hook up four 6x8 3-way and one 12''sub. the amp has bass EQ on ch. 3. how would i hook it up and get the most power. can i put the 4 6x8 bridged all together...

run two 6x8s on each of the front channels of the amp. then depending on the sub you can bridge it on the rear channels.only if its a single four ohm. if its a dual 2 ohm sub run each coil on each channel. 1 coil-1channel. the other coil-the other channel. amp should run fine may run a little hot since it will be doing all it can do at a safe ohm load. just make sure it is mounted in a well vented area. should be safe.

Dec 25, 2009 | Alpine MRP-F240 Car Audio Amplifier

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Amp in protect


Jun 20, 2009 | Visonik V408XT 250W x 2 Car Amp Car Audio...

1 Answer

Visonik amp problem... amp goes in and out of protection

Check for intermittent shorts on the speaker leads.

Turn down the volume control on your head unit while operating the amp, you could be over driving the amp.

Remove Speaker leads and reset the amplifier. IF the protection LED still comes on amplifier is faulty.

Below is the link to put in a help request with the manufacture for repair.

Mar 25, 2009 | Visonik V408XT 250W x 2 Car Amp Car Audio...

1 Answer


run a wire from the battery to the place u are putting the amp. place a fuse in that wire no more than 10 inches away from the positive batt terminal. find a bolt near the amp and see if it is grounded. if so connect a wire from the bolt to your neg terminal on the amp. then run a remote wire and your rca from your radio to the amp. then connect a set of speaker wire from the amp to the subs or speakers

Apr 12, 2008 | Visonik V408XT 250W x 2 Car Amp Car Audio...

1 Answer

Sond gone

sounds like an internal problem. first disconnect all spks from amp, then switch on head unit and check if amp turns on (LED ON?) then feel the heatsink, if heatsink gets terribly hot then amp has internal fault. if amp doesnt get hot then try connecting a single working speaker to each channel separately, it may occur that one channel is faulty only. amps can shut down if the speaker/s is faulty as well, check all speakers and spk wires for shorts before taking amp in for repair. cheers

Aug 04, 2007 | MTX Thunder 8302 Car Audio Amplifier

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