Stereo & Electronics - should i or not?

alright so i have JBL coaxials all the way around , a 300.1 mono amp and a 10 inch sub all connected to a panasonic deck...... my question is in the back there are cutouts for 2 more speakers .... should i put two more speakers there? and if so what size are those? ...Im happy with the sound i have now but there is always room to make it better.

Nope.

I wouldn't bother.

If you're running your JBLs off of the head unit and you want to upgrade something, I'd recommend adding a 4 channel amp to drive those.

yeah thought about doing that too... i may go in that direction