Speaking of efficiency.. There is one brand in Spain.. Its called Beyma. They have speakers that are rated on 200 rms and have efficiency of 97 db.. 6.5 mids.. That sounds good in the numbers,but i dont really see anybody talking about them anywhere so.. Looks like they arent as good as the numbers say.
Well for one, they're PA speakers, they are ridiculously efficient. Two, they aren't the most practical to use, let me explain. They can handle power no problem, but the down fall with PA speakers of this size, is that most will fall flat on their face around 80hz, and most CA dwellers want mids to play below that.
The difference in PA is that you have basically unlimited space, so that 6.5 is probably used as a lower midrange driver playing form 200hz up to make 1-2khz, because there is no issue cramming 2 15" woofers to take up the lowend slack.
That isn't easily doable in the car audio realm. If you're ok with a mid only playing down to 70-80hz tops, then by all means put them in there, actually I'd lean towards something from B&C or 18Sound.
Anyways, about your original topic. i'm just curious but have you actually
heard a front stage running that much power? I'm not being rude, this is a serious question. I run about 100 watts per door speaker and about 30 to each tweeter, and it can easily get loud enough to the point of it being uncomfortable.
You don't
need that much power, trust me. Plus if you feel the sub is too loud, just turn the **** thing down, pretty simple, and free.