Question about Alpine Car Speakers & Subwoofers

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I got an alpine apx 1300 300w and the protection light is turned on

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Most likely there is a short in the output stage. This would mean changing the output IC's and most likely the damaged support compoenents and driver devices.

The Alpine service rep can fix this for you. Some serious troubleshooting will be required.


The cause of this type of faulure is usualy from the following:

  • Short on the speaker wires, either to ground or to each other.
  • Damaged voice coil or crossover causing too much loading.
  • Power surge due to poor voltage regulation.
  • Playing the unit too loud and having clipping (distortion) in the sound. This usually also damages the speakers.

Jerry G.

Posted on May 29, 2008

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I have a a 12" alpine 1243d hooked up to an


You may have blown a fuse, check those to make sure they aren't blown. Verify that the connections are in place again and make sure the settings on the amp are correct as well.
If the fuse isn't blown and the connections are secure, I would make sure that the wire that you have ran from your battery is within the specifications for use with your amplifier.

Mar 05, 2011 | Alpine Type-R SWR-1222D Car Subwoofer

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Hi i have problems with my subwoofer it wont play it's an alpine 12'' type e with alpine mrp m350 amp. there is light on the amp. how do I find out my subwoofer is blown or what else can be...


ok, your amp is in protect mode. either the speaker wires are crossed and shorting out, your woofer's vioce coils are melted and the speaker is blown or the amp is dead.

to determine if the speakers voice coils are melted, and thus the speaker being blown is the reason for the "protect" light, simply push in the cone of the woofer in gently with your hand. the woofer should move a little more than an inch, without any resistance, before bottoming out. if there feels to be any resistance, like a rubbing or scratching, before the woofer bottoms out, then your voice coils are fried, and you need a new woofer.

Nov 25, 2010 | Car Speakers & Subwoofers

1 Answer

Alpine sub works for a bit then stops.


the amp maybe going into protect mode. it may be seeing a fault internal and causing this. so i would have to say check all the wiring over and if that is okay you will need to take the amp for repair

Feb 01, 2010 | Car Speakers & Subwoofers

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this sounds like an ohm load problem do u have it bridged

Nov 01, 2009 | Alpine SWR-1222D 12" Type-R Series...

1 Answer

My subwoofer quit on me and i cant get out any sound. i have a alpine stereo and two amp looking things in the back


I could be a number of things, first of all if the red light on your amp is on when the car is powered up your amp is in protect mode and you either have a bad sub or amp, if your amp does not even turn on you have a fuse blown somewhere

Aug 21, 2009 | Car Speakers & Subwoofers

1 Answer

Sub cutting out


500W x 1 @ 2ohm

How did you "switch the sub from 2ohms to 4 ohms"?

If you have the swr-1222d as listed, your only options are wiring 1 or 4 ohm, as it is a dual 2 ohm voicecoil.

If it was wired @ 1 ohm - you may have already done the damage to your amplifier - as it is not rated @ 1ohm mono.

There are 3 reasons the amplifier will go into protect mode while playing...
Thermal - overheating due to too low impedence.
Ground Loop/Short Circuit - Blown voicecoil, bad amplifier ground, tinsel slap, etc.
Overload - Impedence not within specs.

Disconnect every wire (including RCAs) from the amplifier. Reconnect only power and ground - make a short wire to loop from power terminal to remote terminal.

If the amplifier stays on without turning off - remove the jumper, add the remote wire, and try again.

If it turns off - the problem is internal and needs repair.

Still on? plug in 1 rca, and re-try.... then the other.

Still going??

Now use an Ohm Meter - or Digital multimeter set to ohms 20, and check both voicecoils. They should read 2ohms +/- .5ohm.

If they are OK, wire up the 4ohm load (series the voicecoils) and turn the gain on the amplifier to 1/2.

Retry -

If the amplifier continues to fail at higher volumes - the thermal protection relay has become weakened because of your improper wiring, and will need to be repaired to solve your issue.

Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

Jun 10, 2009 | Alpine Type-R SWR-1222D Car Subwoofer

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Alpine sub woofer


your speakers are hooked up wrong. hook both positives together and both negatives together and bridge it to the amp. if it is one channel hook it up as one together. if it is 2 channel hook positive to one side and negative to the other side.

May 18, 2009 | Alpine Type-R SWR-1222D Car Subwoofer

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I have an Alpine MRV-450 and it seems to cut out for 10 minutes and then come back on. The light turns blue while not producing sound. Is it overheating? If so is ther a solution to this problem?


how long before it shutsdown. what impedance are your speakers (single/dual 4ohm? etc) and how are they wired to the amp if it gets real hot and protection kicks on i imagine your speaks need wired different (series instead of parallel)

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1 Answer

Alpine cdm 9823 does not make any sound at all everything but it does not sound at all


This may have one or two things going on here:

First, do you have car ampifiers in the vehicle? If so, this is an indication that the problem might be with and amp....check power and connections at the amp.

Second, it may be a radio setting. In the settings menu on the Alpine, there is an option to turn the internal amplifier on/off. Make sure that it is set to on or you'll have power and no sound.

Third, you may have a speaker short or bad speaker somewhere. To protect it's internal amplifier, the radio will turn off the sound output when it sees a speaker is shorted or grounding somewhere in the system. This can happen when a speaker's voice coil goes bad or when a speaker terminal contact is touching metal somewhere in the car.

If none of these ideas points to the solution, I'd recommend visiting a local car stereo shop to have them further troubleshoot. Hope this information was helpful.

Sep 28, 2008 | Alpine Car Speakers & Subwoofers

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