I get it, the higher the impedance, the more power you need to drive the speaker/s...thus, 4 ohm at 200 watts (all power measurement are exactly equal for this post) should be equal to 400 watts going into 8 ohms. Is there really any difference? I imagine if your amp is powering a 4 ohm speaker there could be slightly more chance to blow your speaker because it is "weaker"...is this true? Why would there be any benefit to using 8 ohm speakers...won't it just push the amp harder/use more power? I am planning on getting the GK MB115 which is 200 into a 4 ohm speaker. I'm not a "power user" so it won't affect my buying decision, but I am curious... What are the pros and cons of each?