God I'd be so pissed if someone broke my window just for that.

 

Ummmmm, no. That's just not right. If you run a single 4-ohm speaker at 150W you'll get a certain output/excursion from that speaker. If you run two in parallel to to get a 2-ohm load, you'll get the same output/excursion from each speaker ... or essentially double the output. The amp gets much hotter putting out, simplistically, double the current at the same voltage (or double the power). Amps aren't necessarily linear when they get near their limits. So on the OPs amp choice it's 150W@4ohm, 300W@2ohm and 500W@1ohm. You're reaching the saturation point for the amp by 1-ohm or it would be 600W. If you wired them in series, you'd have an 8 ohm load and would be getting basically 1/2 the current to each speaker (but, the amp isn't designed to work in that range). If you wire them so they are each 75W, you are getting 1/2 the power to each speaker. Since speaker output isn't linear, it depends on the speaker and frequency, but simplistically you'd be getting the same output from 2 speakers as you would from 1 in that case. Nothing in the system is linear and perfect, so reality is slightly different. But, not even close to the same output by changing the wiring.

 

Simply put...more amp, less pressure. Give your speakers more than adequate power and you risk less distortion and electrical issues (I cannot tell you how many times I have DC'ed a sub by pushing a RF smaller amp to it's limit). Get a more powerful amp and utilize less distorted audio. If you are like me and you like clear audio...this is the way. It's really only $100 difference in amps and way more than that in performance gain.