upgrading base speakers

[chitown1211]

I have the base 4 speaker system with the factory NAV unit. I am going to add dash speakers and upgrade the 6.5" in the doors and 6X9 in the rear.

Iam just not sure what ohm dash speakers I need to use 2ohm or 4ohm? I will will be tapping the lines for the door speakers.

Am I ok using 4ohm for all 3 sets or do the dash speakers need to be 2 ohm?

Ive searched quite a bit and the only info I find is for people upgrading using the factory amp. I cant find any concrete info when NOT using an amp regarding ohms ???

[troy_audi0]

The dash speaker hole is a 4" I would use all 4Ohm & just
Run wire from the dash speaker to the HU & tapin at the harness..
drop a 4Ohm resister inline before you conect to the radio..
Peace Troy