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I have Oris 200 horns (Tangband W8-1772 drivers) mated to Welbourne/Cabasse bass units and I'm headed towards an active system using the MiniDSP 2x4HD device.
The crossover options are many and I am hoping for some recommendations and discussion of which type and what frequency cutoff to use. Here are the options( per the minidsp manual):
Butterworth (BW) Available in 6, 12, 18, 24, 30, 36, 42, and 48 dB/octave, Butterworth crossover filters are 3 dB down at the cutoff frequency.
Linkwitz-Riley (LR) Available in 12, 24, 36, and 48 dB/octave, Linkwitz-Riley crossover filters are 6 dB down at the cutoff frequency.
Bessel Available in 12 dB/octave only, a Bessel filter gives a more gradual roll-off through the crossover region.
Also concerning the cutoff frequency, should I chose the same value for the low pass and high pass?
Thanks for any and all suggestions.
Follow Ups:
I'm looking for a starting point. First try this, (listen for these things or measure that) then try this other thing.
I;m assuming 200hz crossing point for the Oris. I've tried BW 6db so far, seems ok.
I;m just seeing if someone has gone down this road before me and possibly benefit from their experience.
You might try the BW.Try 6db at about 250Hz for the top and 24db at 150-180hz bottom.The 6 and 24 db/oct slopes will be in-phase.It is just a matter of bringing the woofers in to fill in the gap.
You can listen for doubling around the 200hz range and adjust from there.
I suggest using music that you are very familiar with.Using a RatShack DB meter usually doesn't produce good results.
I've heard several systems ,done in this manner.Looks good on paper,sounds like _ELL.
Tom:cat
The problem is that you need to include the response of the two speakers in figuring crossovers. Standard crossovers assume flat response at the crossover points and for an octave or 2 above or below(depending on whether it is high pass or low pass). If that isn't true with a predetermined crossover the final result will not actually be the format you chose. Unless the crossover is basically infinitely variable you need to play with different crossover points for the two speakers and/or different transfer functions(LR, Bessel, etc.). And that can be a turkey shoot especially if you don't have good measuring devices.
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