Question about Alpine Car Audio & Video
It sounds like the sub woofer amplifier is pulling down the voltage level in the truck when it starts to get really loud. It may be the voltage regulator which is probably part of the alternator, or the alternator is not capable of supplying the needed current for the amplifier. If the voltage level drops below a certain level, the radio will see it as if the battery is disconnected. It requires a voltage level of around at least 10 volts to stay turned on. When an amplifier is playing loud, it draws a lot of current. If the current supply does not increase, it lowers the voltage level to compensate and get the current it needs to play at the level the head unit is pushing it to. As the voltage level goes down, the current increases when the voltage is dropping due to increased demand. You could check this with a voltage meter and monitor the level right at the battery and have somebody turn the volume up on the head unit slowly as you monitor the voltage level. The normal operating voltage of a car while the engine is running is about 14.4 volts. It should not drop much at all, no matter how loud the amplifier is playing. if it does drop, you have a problem with the trucks regulator or alternator.
I hope this helps, if you need more assistance let me know.
Posted on Jul 08, 2008
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Posted on Jan 02, 2017
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Hi Gott Mudd,
I can relate to feeling it in the bones. You got the stuff to do it. You should try the Alpine MP3 head units with bass boost, those are bad to the bone.
Amp to Speaker I like to use the code VC for Voice coil, and AO for Amplifier output. Also + for positive. If I say VC1-, I am referring to the first connector starting left to right on the Alpine Sub. Now I have not seen a Kicker KX1200.1 amplifier. All I see are MRA, MRP, or PDX prefix on the part numbers. So take what I am saying as a guess. You may want to revisit looking at the model of the amp to be sure your giving the right information.
We are going for 2 Ohms. Paralleling the two subs, not the voice coils. The voice coils will be series. Bridge the amp if necessary to get mono channel. only using AO+ and AO- for output.
AO+ to Sub1VC1+
AO+ to Sub2VC1+
Sub1VC1- to Sub1VC2+
Sub2VC1- to Sub2VC2+
AO- to Sub1VC2-
AO- to Sub2VC2-
Set your Crossover to LPF
Adjust the bass gain down to lowest until you test.
Set the Frequencies to midrange between 40 and 100hz
Your box can be ported or not. It depends on the space your have. If you do not have much room, go Enclosed and build a box that the inside space is less than 1 cubic foot. Make sure you give barely enough clearance for the speaker to fit. If you have room, Go with a box and vent it with a 3 inch Vent tube 10 inches long.
Oct 15, 2007 | Alpine Type-R SWR-1242D Car Subwoofer
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