Hey, I have a Peavey mark VI Bass head. for all the years I have had it I always followed the manuals instrutions to leave the DDT enabled to protect my speakers. Does anyone know exatcly what this does? I am running an 8ohm EV 4X10 and a Old 8ohm JBL cabinet. I dont always use the 18. In fact if shutting off the ddts will help me get a little more volume I'll probably drop the 18. I am going to experiment at rehearsal tonight with disabling it, but I'd still like to know what exactly it is compressing.. Thanks.