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Discussion Starter #1
I've read through all of the listings under the Audio forum and although very informative, I could not find the answer I was looking for so here goes a new thread.

I am looking to upgrade everything but the Factory head unit on my 2013 CT with premium sound.
I will be installing the following:

Audio Control LC7i
Audio Control EQX
JL Audio HD900/5
Focal 165KRX 2-way
Alpine Coaxials 6.5
2 JL 10" subs in custom box

I've been told stock amp is under the passenger seat. How many speaker level outputs are coming off the amp? I need to sum the signals through the LC7i so I want to make sure I properly capture all frequencies. I read the front L and R are made up of 4 channels and the tweeter on the pillar shares the frequencies with the dash speakers. The mid bass on the doors are the other two L and R channels.
The rear door have their own 2 channels producing full range (although quite weak and essentially useless). The sub also has its own channel fully crossed over. I won't be replacing the center channel but I do want to make sure it still works for phone calls, etc. This creates the 10 speaker system but how many channels is the amp truly sending out. My guess is the 6 speakers up front require 4 channels and so does the sub. But I was thinking the two rear speakers and center channel come off the head unit directly and that is why they are weaker in sound therefore the factory premium amp is basically a 4 channel amp? Can anyone confirm this?

Secondly, has anyone summed the OEM signals of the factory amp? I hear that's where the summing is to take place (after the amp) and if so, will my LC7i (6 channel line in) be sufficient to sum all signals. If my theory is correct, I should be fine because I only need 5 line in's.
But before I start ripping things out, I'd like to hear from someone with experience. A wiring diagram of the premium system (specific to the CT) would be greatly appreciated. Any insight on removal of panels, seats, etc. would also be welcomed.

Thanks
 

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download the CT service manual (via bittorrent sharing sites). it has a wiring diagram and instructions on how to get into the the panels and amp under the seats
 

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Discussion Starter #5
I went on the site and found one file from a sponsor called " save the planet". Containing 238kb.
Was that the file you downloaded?
Thanks
 

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its not that hard to find is it?

xxx/torrent/7082041/Lexus_CT200h_Service_Manual

replace xxx with the following - https : // thepiratebay . se/
 

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I got my service manual from Pirate bay without any problems and it is a god send. Has everything you will need down to torque settings and any Lexus specific tools. And it runs through any browser. But mine was 908 Mb.
 
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