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Old 12th May 2007, 04:28 PM   #1
mrbubbs is offline mrbubbs  United States
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Default Can anyone identify this crossover design?

Hello,

A friend has a pair of McIntosh ML-1C speakers. He is trying to convert them from 4-way to 3-way, perhaps Linkwitz-Riley, I think. We're not sure what order/design is being used in the crossover in the image attached. Can anyone help identify what design is being used? Thanks!
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Old 12th May 2007, 05:05 PM   #2
sreten is offline sreten  United Kingdom
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Location: Brighton UK
Hi,

The electrical design of a crossover is not the required acoustic design.

ML-1C Loudspeaker system, 4-way bookshelf system has :
12" woofer, 8"lower mid, 1-1/2" soft dome upper mid and 2-1/4" tweeter.
Crossover frequencies: 250 Hz, 1.5kHz and 7kHz
Impedance: 8 ohms
Output: 89dB @1w/1m
Power rating: 100w
Size: 26"H, 15"W and 13-1/2"D
Weight: 64lbs.
Sold from: 1970 to 1975
Last retail price: $399.00 each

W is 1st order electrical low pass with zobel
LM is 1st order electrical low and high pass
UM is 1st order lelectrical low pass and 2nd order electrical high pass
T is 2nd order electrical high pass

note the acoustic slopes are not known,
the c/o points above should be acoustic, not electrical.

/sreten.
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Old 12th May 2007, 06:51 PM   #3
mrbubbs is offline mrbubbs  United States
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Thanks, sreten! I admittedly don't know a lot about crossovers. I have been doing more with single-driver designs. Your point about electrical versus acoustical turned what little I thought I knew about crossover design into confusion, but I have a few books on order and will read more about it.

Thanks again!
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Old 12th May 2007, 09:12 PM   #4
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Location: Wellington, New Zealand
At its most basic - all drivers exhibit their own rolloff at the top / bottom of their operating ranges. This natural rolloff - combined with any electrical crossover slope gives the acoustic rolloff.

For example. Take a theoretical midrange driver that is already rolling off at 200Hz down to 100Hz at a rate of 6dB (first order being one octave between 200Hz and 100Hz). Put a 1st order highpass crossover on the midrange (so it can crossover to the woofer) - you will end up with a 2nd order acoustic slope (more or less). The 6dB of electrical slope combines with the drivers natural 6dB fall from 200Hz to 100Hz to give a 2nd order (12dB) slope.

Cheers,
David.
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Old 13th May 2007, 04:39 AM   #5
mrbubbs is offline mrbubbs  United States
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Hey, Dave...

That makes sense now. Thanks for the explanation!
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