how do i workout what drivers i need

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   i need to replace the  8 and 15` drivers in my JBL sound power series mid tops how do i workout what are the best drivers do i need to know the Xover points of the internal passive crossover. do both replacment drives need the same sensityivity. the whole box is ment to be 750w so i was thinking of a 500w 15 and 150-200w 8` as i recon the 2'' tweeter is about 100w 

thanks for your advice john 

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johnny B Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 07 December 2007 Location: United Kingdom Status: Offline Points: 91	Post Options Post Reply Quote johnny B Report Post Thanks(0) Quote Reply Topic: how do i workout what drivers i need Posted: 24 December 2007 at 5:01pm
	i need to replace the 8 and 15` drivers in my JBL sound power series mid tops how do i workout what are the best drivers do i need to know the Xover points of the internal passive crossover. do both replacment drives need the same sensityivity. the whole box is ment to be 750w so i was thinking of a 500w 15 and 150-200w 8` as i recon the 2'' tweeter is about 100w thanks for your advice john

ceharden Members Profile Send Private Message Find Members Posts Add to Buddy List The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11753	Post Options Post Reply Quote ceharden Report Post Thanks(0) Quote Reply Posted: 24 December 2007 at 6:20pm
	Firstly, you can't really work out power handling by adding up the rating of the individual drivers. Because when you split the signal using the crossover it depends on the frequency range how much power goes there. I would say as long as you are using decent professional drivers, the power handling is probably one of the last specs to look at. The most important thing to look at is what frequency range they need to cover and how they are loaded (reflex,sealed cab,horn etc). I'm guessing the 15" will be doing something like 100Hz-500Hz if you run subs underneath or all the way down if you don't. As an example I would suggest something like the B&C 15PLB76. For the 8" which is probably doing midrange from 500-2kHz maybe then a driver like the B&C 8PE21 might work well. I don't know the cab you have so it's just an educated guess at the moment...