Since you have two dual 4 ohm voice coil subs, hopefully you had one sub wired in parallel to each channel separately (one sub on 3, one sub on 4). That way, each channel gets 2 ohms. If you have both subs bridged across channels 3 and 4 (left + and right -) then you have applied a 1 ohm load to your amp, which would cause the problem you're having. It's possible the amp has been damaged, but the fuses on the amp should have blown to protect the amp. Check your sub wiring to make sure you don't have a 1 ohm load bridged across channels 3 and 4. Also check the fuses on the amp itself to make sure neither of them have blown. If everything is fine there, check your fuse under the hood that's connected to your battery. That fuse could have also blown.
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SOURCE: My amp turns on but once you turn the volume up it shuts off
What is happening is an overload situation. If you can use either left or right (white or red) RCA inputs but not both, then the amp is overloading and getting hot internally and probably getting ready to die. You'll need someone to fix the final drivers in the amp.
Hope this helps, and please rate my advice.
Thank you, and good luck!!
SOURCE: sony xplod 500w 4/3 channel
If the speaker is a 4 ohm DVC (two 4 ohm coils), you can't wire it to get a single 4 ohm load. Try connecting one coil to each of the two rear channels. It may not be as loud but the amp should operate without going into protection.
If the two 4 ohm coils are in parallel, the amp is driving a 2 ohm mono load. That's probably why it's shutting down.
SOURCE: Kenwood eXcelon KAC-X810D
On the top of the amplifier are 4 controls. The first one is labeled as "input sensitivity". That is the adjustment you need to make. It would need to be set at around mid way between minimum and maximum.
One way for you to set it perfectly for your speaker would be to have it set first at about 1/4th of maximum, and then with the volume of the head unit turned all the way up with some heavy bass playing start to turn the input sensitivity up very slowly until you hear a small amount of distortion or rattling from the sub woofer. At that point you would back it down just a touch until there is no distortion or rattling from the speaker. This would have your amplifier set at a point where it is not pushing the speaker too hard but you would be getting the most from it.
Remember that any time you hear distortion, you are either pushing the speaker too hard or the amp too hard. The distortion is caused by clipping, which is not a good thing. If there is no clipping from the amp, and no abnormal sound from the speaker, you have it set properly to get the most from both the amp and the speaker and you are then minimizing the chance of damaging either the amp or the speaker.
Very wise decision on your part to want to use your equipment properly and not expect more than it is actually capable of. Many people just push their equipment to the max and then complain about how it broke down on them. If you follow my instructions you should be able to keep your sub woofer and amplifier in good working condition for as long as possible. It is no guarantee that it will never break down on you, but you will at least give it it's best chance for longevity.
SOURCE: Amp Power light will not go on. Protection light is lit- Thump sound in speakers
It probably has shorted output transistors. To eliminate other possible causes, read through the following page.
Amplifier in Protect Mode - Troubleshooting
Let me know if you have any other questions.
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