Ohm's law states that in an electrical circuit, the current passing through a conductor between two points is directly proportional to the potential difference (i.e. voltage drop or voltage) across the two points, and inversely proportional to the resistance between them. (wikipedia) Basically, I can't wrap my brain around impedance, 4 ohms, 8 ohms, what does it all mean? I can run a cabinet at X wattage at Y ohms, or W ohms at Z wattage. I just don't get it.