Guru crossover point selection consideration

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Re: High Pass xovers: One consideration is the power that will get to the tweeter. The slope of the crossover and how far it is from resonance is a major consideration in choosing a particular order of crossover and xover point. What percentage of power or voltage is acceptable at resonance taking into account both xover attenuation and power distribution as noted in http://sound.westhost.com/bi-amp.htm? Is .1% power reasonable or too bold? I realize that the power rating and power input is important, but I am looking for a safe rule of thumb.

For low pass, beaming is an important consideration. What do you target (-3dB at 30, 45, 60 degrees, etc.)?

I appreciate all opinions and input.

Thanks,
 
I've used the basic rule of a minimum of 1.5 to 2 octaves above the tweeter Fs and have never had problems even using 1st order electrical slopes which end up being 2nd to 3rd order acoustic. Tweeters are strong little devils and I've never blown one yet even with some idiotic crossover points (miscalcuations) during testing.

If the tweeter has a problem with that, then it's the wrong choice for the application or it's as weak as.

For the low pass, I look for the -3dB at 30°.
 
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