The sxA100 is actually rated at 350 watts for the bottom, but that IS in fact a peak rating, and not continuous. The Mackie 450's also "bend" the truth in this area, because only the amp section is capable of delivering 300 watts to the bottom end - the speaker is not the proper ohmage to allow full power to the woofer, so you are really getting closer to 150-175 watts for lows on the mackie. They sound great, but it's not 450 "real" watts .... it's just POSSIBLE to get that power rating, but not in the factory configuaration.
Speaker ratings are pretty subjective across the board, so use your ears and not your eyes when you buy speakers, and remember:
To get TWICE the volume, you need TEN TIMES the power. It's a logrythmic calculation and is not as plain as it sounds.
A 200watt amp is only 10% louder than a 100 watt amp, so it's not a night and day difference between 150 and 300 watts. More headroom, yes .... but not neccisarily more sound, or better sound either.
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