hey guys, so i got a vellfire that comes with a original factory amplifier that drives my home theater speakers. i think around 10 or more speakers...im not sure. the thing is im planning to change my headunit to an aftermarket. im cracking my head how do i integrate the amplifier into the aftermarket headunit? correct me if im wrong, does the rear camera signal also goes into that processor thinggy?

If you are planning to change your original head unit to after market Android then you will lost the value of original Toyota home theater system.next time you selling off your car the price will be deducted around 5K minimum,cause this system it's coming with his own processor hiding under your passenger seat.
Think twice before yo do it.
Unless the head unit spoil otherwise really don't recommend you to change local unit.
The sound not comes out as you expected.
You can by passed the processor but for wiring and others work to do,from 11 speakers downgrade to stereo sound with Android system you can search before you change in alphard or hellfire group.
If you want to watch movies link your Bluetooth with you iPad or phone will be good enough.
This system come with very expensive price when they pay as optional purchase around rm 18K Malaysia ringgit for panaromic premium sound,11 speakers there are two resonator hiding just slightly behind your driver seat and passenger seat although there it's no any visible speakers girl but you can hear it when you play music.
25K for full 18 speaker with roof monitor Toyota system.
Believe me you car sound system are far away better then new model JBL system.if you don't believe can do some research.

This post has been edited by hukaka: Sep 24 2019, 06:17 PM

the only way to do it is to redo the whole system if you wan a real proper solution.

1. change headunit
2. get a multi channel dsp
3. get an underseat subwoofer

just fyi, aftermarket headunit do not process 5.1 as the oem theater system do, and the oem theater only do the 5.1 decoding when you play dvd..so if you do not play dvd all the time, a upgrade using stereo system will actually sound much better than the oem theater system.

has done a few, here's an example

1. headunit change
2. 8ch dsp, front, second row, third row and sub
3. upgrade front speaker (optional)
4. upgrade rear speaker (optional)
5. add in a pair of speaker at third row (optional)
6. add an underseat and get rid of the oem 1 (good sound after done this)

oem tend to give u a lot in quantity, but in terms of quality, still far away..that's why it's called an upgrade..not a replacement

thank you guys for the info. From what i can summarize, i have given up trying to get this integration to work. Firstly the cost is to high and the rework is too big of a mess. Im just afraid the complication might lead to other parts of the car. Nevermind i shall just settle with the current setup. if i were to add a new system while bypassing the oem factory system which is still working fine, then it becomes redundant. Its not like i can transfer the oem system to another car or something like that. it becomes no value. anyway thank you very much for your input guys.