Question about Alpine MRP-F250 Car Audio Amplifier

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Amp on but no sound from subs

My amp light is on but know sound from subs. i reconnected everything and amp still turns on but still no sound from subs.don't know when it happend and dont know what to do

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  • 74 Answers

Make sure that you have a good set of RCA cables. Then make sure that you have 14 gauge speaker wire. As for amp make sure that you use 8 or 10 gauge wire. Make sure you have a good GROUND.

Posted on Dec 22, 2008

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I got a sony xm-460gtx amp I hooked it up in my truck everything was working fine then I disconnected the battery and reconnected it now there's power to the amp but no sound out of the amp???


If you are getting power the amp lights will be on k so I would check your coax cables and all hook ups to the amp. on some radios there is a sub control that will turn on your sub and to adjust your bass mine does the same thing when i disconnect power to the radio.

Oct 31, 2011 | Sony Car Audio & Video

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Well i was driving one day and my subs just whent out so i bought brand new wires and hooked everything up but the power protector light turns red whenever uu turn it up past volume 10 i really do not know...


It sounds like your amp is going into protection. I know it's frustrating, but this is actually a good thing. If you subs you have are drawing too much power and the amp can't keep up, it will shut off instead of melting the board. Usually, the protection mode only last a few seconds. The user normally turns the music down that the protection shuts off and the music plays again. I recommend looking at a larger amp for your subs, if you are going to play them that hard.

Aug 14, 2011 | Car Audio & Video

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My subs/amp are not working


when you car is running, it charges the battery somewhat. So the voltage problem is not a problem. The red light means the amp is going into ''Protect Mode". This usually happens when something is wrong with the amp. Usually the amp is getting hot. Check all of you connectiong and check the final impedance of the subs. Make sure the amp can handle the impedance of the subs. If you need anymore help, message me.

Feb 12, 2010 | Kenwood Excelon KAC-X621 Car Audio...

1 Answer

The light comes on but little sound comes out


theres a chance you may have blown up the amp. never put a sub that is to strong for the amp because its pushing all of the energy out of the amp to power up the sub, causing the amp to blow a fuse or the channels, on the back there is control of frequency turn everything all the way up to see if you can even get it to thump hard but dont blow your sub if it pops turn down some stuff and check the head unit to where its fading to the front or rear and balance to left or right

Jul 27, 2009 | Legacy LA1478 Car Amp

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KAC-9102d no sound, Amp powers on but no sound to the subs.


If the sub isn't working, you won't get a pop. All you need is a small speaker. Don't need a sub, you just want to test the sound. I recently blew 2 subs, no smoke, no smell, no sign of being blown. Absolutely nothing from the subs.... In the past my sub locked up. You can take your sub out of the box and hook the + and - to the battery to see if you can get the sub to pop there. I believe a small box will push a sub into a deep excursion to the center of the cone. I have 2 lanzar VW12D's that just quit. I hooked a 6 x 9 up to my amp and low and behold I had sound! Try that and see what you get...

Feb 07, 2009 | Kenwood KAC-9102D Car Audio Amplifier

1 Answer

Thermal switch or possibly a stressed amplifier module?


I would make shure the Plus and negitive are right. Also if it was smoking you probly blew the power supply out of amp. From to many ohms loads. Hope this helps you out

Jan 04, 2009 | Car Audio & Video

1 Answer

Phoenix Gold Xenon 1200 mono not pushing subs and making noise.


This sounds like a problem with the head unit output to the sub amp. Are you using a Pioneer head unit? If so, you may have a problem with some surface mounted fuses inside the radio on the main board. Certain Pioneer head units have a common problem with these fuses blowing. They are fuses for the ground on the RCA outputs.

Let me know if this is the case, and if it is I can give you the part number of these fuses and tell you where they are located, but you would need good soldering skills to replace them. Also let me know what model number your head unit is.

Thanks,

Dave

Sep 08, 2008 | Car Audio & Video

1 Answer

Car audio


hi, your amp seems to be getting power but the cables might be wrong so it's not getting enough power. the light on the amp should be green if everything is going well. are you sure the cables are suitable for your amp?

Sep 11, 2007 | MTX RT202 Car Audio Amplifier

2 Answers

Amplifier On - No Sub Sound


Are you certain you put the wires back on the amp the exact way they came off. I am not familiar with this amp but most amps if you look at the terminals where the speakers hook up there will be a plus and a minus. And generally there are four terminals. hence stereo plus and minus left and right. Some even have eight for, four channels. Since the amp is on, not getting hot and you tried two different audio inputs I would suspect speaker wiring or maybe the stuff you put in your trunk bumped a switch on the amplifier. I know this is not the exact answer you are probaly looking for but it is at least a place to start

Jan 11, 2007 | Sony XM-DS1300P5 Car Audio Amplifier

1 Answer

Amp is on, Subwoofer works, but no sound.


here is a short test you can try, remove the rca audio cable from the amp & connect a diskman or toher audio o/p device that you can hook up with the same rca wires, turn on the amp & see if you have sound. you can also remove the speaker wires from the sub & using multi meter read the ohm's of the sub, most subs are 4 ohm. Hope this help locate your problem

Oct 24, 2006 | Pioneer GM-7200M Car Audio Amplifier

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