Audio update on a 123 300D

[juanesoto]

Hello everyone.

I'm planning to do an update to my audio system. This is what I plan to install:

-Front speakers: Blaupunkt 4" 2-way 110 Watts speakers in the original place
-Rear speakers: Blaupunkt 6.5"OS 3-way 150 Watts speakers in the original place using round spacers
- Subwoofer: MA Audio 8" 500 Watts competition subwoofer installed in a spacer I built for the first aid kit compartment (I plan to remove the compartment and use the trunk as baffle) and a MA Audio Monoblock 500 Watts amplifier installed in the deck where the rear speakers sit.

I already have a Pioneer head installed. 45 watts x 4

I have some questions for you guys. First, I still have the original fader control installed (only using 2 channels from the radio) so I'm planning to use the original front speaker cables to plug the front speakers to the radio directly. Will the original cables handle the power requirements?

Second, I plan to use the original rear speaker cables and add the require lenght of cable to plug them directly to the radio, skipping the fader control. Again, will the original cables handle the power requirements?

Third, I'll run RCA cables from the radio outputs to the amplifier following the path of the orginal speaker cables. Which would be a correct path for the power cable for the amp?

Fourht, should I connect the amp directly to the battery or is there a power line inside the car that can handle the power requirements?

Thanks for any advice you can give me.