Question about Alpine Car Audio & Video
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Posted on Jan 02, 2017
SOURCE: I have an Alpine CDA-9815
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
You need to run the RCA cables from the head unit to the sub for the audio signal, and possibly a turn on wire (the blue one on the back of the head unit), unless the sub has an automatic power feature.
The sub also needs power and ground wires attached, but those do not connect to the head unit. Power should be run directly from the battery with an inline fuse, and ground should go to the nearest good ground point (Trunk latch, seat bolt, etc).
Posted on Mar 28, 2009
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