Question about Crossfire VR404 Car Audio Amplifier

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I have a Crossfire VR404 amp in my car and its running my subs and my front speakers. I took my subs out temporarily so it just running my front speakers. everything runs fine but about every 10 seconds my fron speakers will cut out for about a half second then work fine. what could be the problem?

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

SOURCE: AMP FOR SUB SHUTS OFF SOMETIMES

your amp may be overheating, or you have it up too loud and the surge protector is shutting it of in fear of damage to your amp.

Posted on Apr 24, 2008

GooFyTiS24
  • 33 Answers

SOURCE: i bought a 500/1 jl audio amp and also a w7 10 sub

if its cutting off and right back on then check your ground and your power wire makes sure both are connected good and none of your fuse's are blown, either that or you got a wire hooked up backwards in the sub.. but my guess is that the sub is hooked up wrong... that sub should be hooked up in a series or in parallel,

ok if your running just one speaker, it should be hooked up like this and 2 speakers are a different way...

this is parallel :pos to pos , neg to neg, then one wire coming from pos on sub to pos on amp then neg on sub to neg on amp but bridge the amp on your amp should be 2 pos and 2 neg in two different channels take the pos off the sub into the pos on 1 channel and then the neg from sub to the neg on the other channel,

this is series : on the sub it will go pos to neg then the other neg and pos will go to the amp, but make sure the pos and neg r on different sides of the sub, dont hook them both to the same coil

if your need more help give me your email and ill send you a pic of how to do it...


Posted on Aug 12, 2008

Devsta
  • 68 Answers

SOURCE: Alpine PDX1.600 amp cuts off

Make sure there's no missmatched impedance. If your sub running 2 ohms then your amp has to be 2 ohms stable. Does the amp blow fuses or get really hot? If it does it can be a fire hazard and I would recommend taking it out of your car. It could be that you don't have sufficient grounding. The grounding needs to be very close to the amp and the paint needs to be thoroughly scratched off. Otherwise could be a blown transistor within the amplifier, you can check this by opening up the amp, running a multimeter and testing the transistors for resistance.

Posted on Aug 05, 2009

  • 5603 Answers

SOURCE: my amp burn one of my 3 subs and i keep playing

You are probably exceeding the rating for the speakers. This amp can deliver 2000 watts to a 2 ohm load. You would need MASSIVE speakers to take this much power. The best of speakers can probably take an HONEST 400 watts... although most LIE big time about their capability. ALSO the spaekers have to have an ENGINEERED enclosure when run at high power. It is unlikely you cna drive 3 speakers evenly so they share the power... one is gonna get fried first...
then the remaining ones will fry...

ALSO make sure you don't send music pitches higher than what the speakers are designed to take. Make sure your crossover prevents highs from getting to subs.

Posted on Dec 22, 2009

  • 2 Answers

SOURCE: i have a jl 1000/1 amp hooke up to 2 12 w6 subs

check your baterry post you need to have them tight i had the same amp and 2 15s L7 the blue light turns on right make sure there not covered in acid corrossion clean them out

Posted on Mar 25, 2010

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The recommended settings for a mofet car amp 50.4 , theres a few knobs not sure what they should be turned to


The gain knob is used to control how much the volume (output) of the amp increases with each increase in volume on the deck (installed in the dash). This is used to match speakers running of your deck. Other knobs are probably for a crossover (labelled in Hz). This controls what frequencies are passed to the speakers connected to the amp. A Highpass (HPF) crossover passes all frequencies above what the knob is set for. A Lowpass (LPF) pass all frequencies below what the knob is set for. A HPF is typically used when the amp is powering component or full range speakers to keep the ultra low frequencies (anything below 90Hz) from going to theses speakers. A LPF is used when the amp is connected to a sub. Subs dont handle higher frequencies very well.

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OK what you are saying now is that your speakers are dual voice coil; models? 4 Ohms per Coil? I have always used single 4 Ohm Voice ciol speakers since amps are mostly based on 4 Ohm outputs. but you can get 8 Ohm dual voice coil subs also. With 8 Ohms per coil you can get 4 Ohms if you parallel the wires. What is best for you and will get you the most stable power and still will be in the specs of that amp is to run the amp in BRIDGED MODE running each subs voice coils in series with each other then run those 2 subs in parallel to the amplifier giving it a 4 Ohm load. So, your will have two sets of wires from your amp 1 for each speaker. Then you will take a short piece of wire that will connect the + to the - of each voice coil then hook up the wires from your amp to each sub What it will be is 4 Ohms + 4 Ohms = 8 Ohms per speaker the 8 Ohms in parallel each speaker to the Bridged amp output using just the + from one channel and the - from the other will give you a total of 4 ohms and power out put of 600 Watts so that ends up being 150 watts per voice coil or 300 watts each speaker
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I would be more worried about the amp than the speakers, those subs should handle the watts with no problem. The problem will be in the amps ability to remain working with a bridged 2 ohm load. It may not even stay on without going into protect mode with a 2 ohm load. If it does stay on then it may get really hot and shut off from the heat off of the Mosfett Transistors, or it could burn the Mosfetts from driving them too hard. Basically it's your choice, run your amp hard and gain more volume or run it with slightly less sound and have a cleaner sounding more stable amp that will stay on and have less chance of being damaged. If it's not loud enough the best thing to do is buy a different amp that better suits your needs and fits the application. In your case a 2 ohm stable Mono amp is going to be your best bet or a 4 channel amp bridged into 2 channels and run with 4 ohms on each channel. Or another exact matching amp like your 2 channel amp bridge them both and have each powering 1 of your 4 ohm subs. I used two VR mono amps to power my two 12" 4 ohm subs for a few years

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1 Answer

My amp burn one of my 3 subs and i keep playing


You are probably exceeding the rating for the speakers. This amp can deliver 2000 watts to a 2 ohm load. You would need MASSIVE speakers to take this much power. The best of speakers can probably take an HONEST 400 watts... although most LIE big time about their capability. ALSO the spaekers have to have an ENGINEERED enclosure when run at high power. It is unlikely you cna drive 3 speakers evenly so they share the power... one is gonna get fried first...
then the remaining ones will fry...

ALSO make sure you don't send music pitches higher than what the speakers are designed to take. Make sure your crossover prevents highs from getting to subs.

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1 Answer

Dus not have sound


Hello keith_freema,

It's possible the sub is defective or isn't getting power from the amp.

Connect the sub to another output temporarily to determine which is causing the problem. If the sub workd on another output, look at the amp. Check that it is powering up properly. Check the onboard fuses and speaker wiring.

Hope this helps.

Aug 31, 2009 | Car Audio & Video

1 Answer

Have stock radio # F75F-19B131-AA its in a 1998 F250 need to know how and if i can hook up one Amp for the two door speakers, and if i can hook up an additional Amp for some subs. Ofcourse if radio can do...


You will need a line level converter for starters (takes speaker level signal and converts it to line level/RCA signal) you connect this to the speaker left/right wires and it has a RCA left right on other end to connect and run to your amps, (you need this box because factory radios don't have RCA outputs on them) At that point all you have to do next is run the power/gnd/rem for your amp and then speaker wires to your front/rear speaker and then sub (if using). You can use one of these converters for your front/back speakers so you will still have use of your front/back/left/right fading options. make sure you disconnect th factory plug/harness at each speaker since the amp will be powering them and you will run speaker wires to each speaker. If you only want one converter it will be on your front channel and your sub will be power by the front. (you will fade to front for more/less sub bass unless your amp has a separate volume/bass control). If you want your sub to fade with rear speakers you will need to install another converter off of the rear speakers. Found a site with some photos that may help you with your project.
http://www.redlineforums.com/forums/howto-section/15003-how-sub-stereo-amp-install-factory.html

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1 Answer

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1 Answer

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is the sub dual or single?check sub first then try disconnecting all power including ground for 20min to discarge caps some amps mute if driven hard at low impedience .

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