Re: higher impedance easier on electric system?
4 ohm would be easier.... but 600w is very miniscule. Your truck should be fine with 600w @ 1 ohm. If it's not, you've probably done something wrong.
On the other hand though.... if you get an amp that does 600w @ 4 ohms, you will have plenty of room to upgrade later on that amp.
2009 Hyundai Elantra - Budget Sound in Progress
HU- Kenwood eXcelon KDC-X994
Fronts- Crescendo MP6 mids, Vifa Ring Radiator tweets on Arc KS300.4
Subs- Single SA-10 on Mmats 2000.1 @ 1ohm
Misc- 1/0 CCA from AT, Big 3 in Stinger HPM, and AT 60 mil deadener
Bought from: Inferno333, select127, treesive, Kangaroux, DonH
Sold to: coolest user, Psychodrama, MidgetClown, mr.tigger, av83