I just wanted to know if a lab series l4 bass head is o.k. to run through a peavey 1820(one 18 inch and 2 ten inch speakers) that is rated at 4 ohms at 450 watts. the head is rated at 500 watts at 8 ohms. I just don't want to blow anything up because I am playing a house show in a few days. It seems to work well at practice....I figure a 1979 18 inch black widdow speaker will take practically anything. haha. thanks for your time!