I thought i would take a shot on this 600 watt head.I missed the sound missing from class D markbass head,thump and trouser flapping i think is the word best to describe what i mean.This amp is a solid state A/B 600 watts at 4 ohms,which i use a Markbass 800 watt 4 ohm cab.Weighs about 11 kilos the head.The sound is great like the amps from yester year.I was looking for the old style bass head of the 80's/90's with out buying second hand or paying a fortune for one. Got this from Thomann in Germany on line for £249.Could not be more pleased with it.