I need some advice from all you knowledgeable people. This is my current rig and it sounds great. Peavey Classic 30 combo connected to 212 peavey extension cab all with blue marvel speakers. My question is am I missing out on anything by not using the peavey classic 30 head unit instead of using my peavey classic 30 combo amp! Is it just a matter of convenience by using a head to run the cab instead of a combo amp? or does it in fact sound better with a head unit?? Thanks!