[custom1970]

Ok, I've put a new radio in the truck, have 6" round speakers in kick panels and put 6x9's under the seat. It's sounds good, but just not as loud as i think it should be, easpecially going down the highway...,
I have an old school Hi-Fonics Odin 150 watt Amp,

What is the best way to hook it up?

To just the 6x9's or to all 4 speakers?
If to all 4 how should i wire it?
Any help would be much appreciated, been a long time since i've done much Audio work...