So my amp has two speaker outputs and says no more than 4 ohms combined. It has no impedance switch so I can hook up anything and it handles it automatically. I understand the water pipe analogy for impedance, kind of, but I still don't understand what happens if I run a 16-ohm speaker in place of my stock 8-ohm. Or thrown a 16-ohm 4x12 cab in there. Or two 8-ohm cabs. Does higher impedance mean a louder speaker? Or a softer speaker? Why?