Step 1: The basics
I took the idea from another instructable in here, but i modified it to fit my needs.
I used a car amplifier, a computer atx power supply, an ipod base, an ipod usb cable, various pieces of wood to make the housing, fabrics, 2 150k resistir, cable, 6 speakers, soldering kit, hot glue and black paint.
Step 2: Connecting the usb, the amp and the power supply
The yellow cables are 12v (this one you connect to the amp), red cables 5v (this one go to the ipod usb), black cables (ground) and other like orange, purple (wont use them).
I took a usb male connector, put on it 5v - red cable - 150k resistor - 150k resistor - ground
As you can see in the pictures it doesnt fit well so i cutted a piece of hard paper (bussiness card) so it could fit an make contact.
Afterwards i realized that it doesnt charged the ipod touch, as a serendipity i found that it needed to make ground with the ipod usb plate, so i took a gound cable from the power supply and pasted it there to make ground. after all is made i applied hot glue.
Step 3: Adapting the base for ipod touch
I just took the base, plugged the ipod touch from the back and applied hot glue.
Next step its to drill a hole for the jack adaptor.
After checking all fits apply hot glue.