Tee,I have run the Alpine F450 4 chanel amp since it came out.Ihave just borrowed a friends pdx4-150.If I like iti'll probably get it.The 450 is an extremely clean amp.I am running it in 4 ohm mode at the moment 70x4.This amp does nothing but slam.You won't go wrong with Alpine.In my little Sentra,I'm running 4 Alpine "r" co-ax, type'R' components w/tweeters,Alpine mrd 1005,450F,Alpine 9847 source unit,2 JL 12w3-3-4 wired to 2 ohms in a slotted port enclosure@1.75 cu.ft per sub.Alpine and JL--it's a great combination.Good Luck.....02 SENTRA..out