Ok, this may be simple to most but I'm not real strong on electrical. I have a Hawg Wired six pack system with the RS400 amp. It's rated at 200 watts (100x2) at 4 ohms and 400 watts (200x2) at 2 ohms. I'm thinking about adding two more speakers down the road to upgrade. If I add two speakers and run them in parallel does that make the amp operate at a 2 ohm load and still put out 100 watts to each of the 4 speakers or am I missing something? Trying to figure out what will give me the best value for an upgrade without having to buy another amp. Would I gain more by adding another set of the ZX's or stay with two speakers but upgrade to higher end speakers? I'm wanting a little more volume without sacrificing sound quality.