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In Reply to: RE: What capacitor values? posted by Halcroman on May 13, 2008 at 06:03:38
Halcroman:
For anyone to help you at all, they would need one of two things:
1) Exact enclosure dimensions, baffle geometry, driver spacing and roundover size plus reasonably close infinite baffle driver measurements.
2) Individual driver measurements ON your chosen baffle.
You can't just select "desired crossover components" and then say "hey, I picked my crossover design, what are the correct values?". There may well be NO VALUES that would work given the measured acoustic response of those three drivers on the baffle that you have chosen.
Have you picked acoustic target transfer functions that will ultimately combine acoustic and electrical rolloff? Probably not. If you don't have a measurement setup (and have no intention of going that path) I would try and find someone to measure your speakers for you and come up with a "real" crossover design.
I have no experience with Hokutone woofers, but not too many 12" woofers have a smooth enough rolloff (with no breakup) to be allowed to "roll off naturally". The Scan drivers are of the best quality, but this does not mean that simple simple crossovers will always work with them. In fact, some of the flattest Scan designs seem to require a fair number of components to deal with a rising midrange response combined with inevitable baffle step issues. Most guys spending the money on Scans might even want MORE crossover components to get a flat measuring speaker worthy of such expense rather than fewer components and a more ragged response.
If you're happy with a minimalist crossover at the expense of reasonably flat amplitude response, then this *might* work. But truth be told, I kind of doubt it. If you're not going to measure you're probably not going to get much help over at Madisound. These guys don't do anything without measuring. Sure, with tonnes of data and baffle/speaker dimensions, one could come up with a "theoretical" design, but this still falls short of the accuracy of measuring what you actually have there. Plus a theoretical model will take 10 times longer than just simply measuring what is actually "there".
Sorry, but throwing capacitors on expensive drivers does not a high-end speaker make! Whoever put you in THAT direction needs to take loudspeakers 101 I am afraid...
Cheers,
Presto
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