Hi, I have a 60W combo with a single 12" speaker. I have a 200W head that I want to run along with the combo (from the stereo out of my effects unit). My question is this... Should I go with a 4x10 or a 1x15? The sounds I like are Jaco's birdland tone, Geddy, etc. I'm using a standard Jazz bass. Thanks in advance for the info. G.