QuestionI have a 2003 Toyota 4runner with the JBL Synthesis Stereo System. This is a 10 speaker system, that is controlled via factory amplifier located near the rear of the truck. The amplifier is supplied by a left and right preamplified signal from the factory head unit. I am attempting to add an aftermarketed 4 channel amplifier to run the factory subwoofer and front door speakers, while preserving the factory amplifier to power the other speakers in the system. To do this, I spliced into the Preamp output of the head unit and ran this to my high level inputs on my amplifier. After some investigating, I see that this will not work, because it is a preamp signal and not high level output. The voltage on the preamp output from the HU seems to be VERY low....like 5 millivolts when measured. My question is this:
Is there a way for me to use this signal? Does it sound typical that the output voltage of the preamp is really only a few millivolts? Can I convert these wires to RCA cables and run them directly to my amplifier low level input, or will I first need to increase the voltage somehow?
Thank you
AnswerNo don't do that, thea to radio sends a very small fix signal and it also sends data
to the amplifier to adjust the signal,
it is best to get the signal after the amplifier, use 2 hi/low one from the front channels the other on the woofer channel you can link l and r from the same output ( bass is mono )
use 2 of this http://www.oemautosound.com/pc-575-132-pie-2-channel-high-to-low-converter.aspx
the signal from one blue cable one can turn on both amplifiers
