hey guys recently all my gear needed some fine tuning so i took it to the shop, leaving only a dirt box, a tele and a old peavy bass amp (1X15). I LOVE the tone coming from that big open 15" duders. I was just curious if anyone is running a 15 underneath their 412 to add a bass roundness? does it work? is there any harm running say a orange 1X15 with a 4X12 out of one head?