OK I admit that I just don't get it..... I am wanting to build up to a head and single 4x10 cab rig, but I want to use my Acoustic B100 1-15" 4 Ohm speaker output to start with. What do I need to look for (4 or 8 ohms) in order to hook up to the B100 for now and later a new bass head TBD later. Thanks in advance!!!