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Date: July 23, 2003 at 19:52:36
From: BW, [pcp01474841pcs.montvl01.pa.comcast.net]
Subject: Re: crossover question


"how does one go about finding out the proper frequency to cross
a driver over at?"

it really depends on the drivers you're using. what is the
frequency range of the woofer/midrange and the tweeter? you
don't want to pick a frequency too low so that the tweeter could
possibly be damaged, but you don't want it too high either. most
of the good 2 way systems i've read about pick a frequency
around 2 kHz (often slightly lower). one such 2 way system is
North Creek's Okara II (http://www.northcreekmusic.com/OkaraII/
OkaraII.htm).

The owner of North Creek is George Short and he definitely knows
a thing or two about crossover design. You can always send him
an email. Brian Owens has both the Rhythm and Borealis systems
and might know Mr. Short. Maybe he'll chime in and give you
some advice! Anyway, he basically says that the crossover
equations don't work. So, this means trial and error. But the
crossover equations may give you somewhere to start.

"And is a higher order crossover better?"
that depends too. generally, the less reactive components in the
signal path the better. so generally, the simpler the design the
better. but i read somewhere that 18 db/octave crossovers are
preferred for some reason; i think it had to do with phase shifts
and such, but i really don't remember. i used to have some good
links to crossover info., i'll see if i can dig those up somewhere.

if you do want to build a crossover of higher order, good luck
finding a place locally that sells inductors. you'll probably have to
order those online - unless you live right next to North Creek or
Parts Express or something :)


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