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Multi-Way Conventional loudspeakers with crossovers

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Old 9th May 2006, 04:33 AM   #1
ppfred is offline ppfred  Canada
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Default Crossover Question

Hi guys,
I need some guidance in my first crossover design.
It seems that the electrical crossover will combine with the natural frequency drop-off of a driver.
I have a tweeter that begins what looks like a -10 dB/octave slope at 1600Hz. I would like to crossover at 2500Hz. Where does the combining effect take place? If I use a 2nd order Xover does the frequency begin to drop-off at a rate of 22 dB/octave immediately at 2500Hz or would this only occur if I crossed over at 1600Hz?

Thanx,
fred p
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Old 9th May 2006, 06:31 AM   #2
ostie01 is offline ostie01  Canada
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Hi, with a 2nd order crossover the slope will be 12dB/octave at 2500Hz. 1st order=6dB , 2nd order= 12dB , 3rd order=18dB and 4th order=24dB/octave
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Old 9th May 2006, 01:46 PM   #3
ppfred is offline ppfred  Canada
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Thanx Ostie.

But the question remains - at what frequency does the driver's natural drop-off rate & the electrical (crossover) rate combine to give a steeper slope.

fred p
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Old 10th May 2006, 09:16 AM   #4
sreten is offline sreten  United Kingdom
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Hi,

if you crossover over first order at 3Khz, then you have an overdamped 3rd order acoustic alignment.
(ignoring the capacitors interaction with the tweeters resonant impedance peak)


Around 3kHz the alignment is ~ first order, but below 1.5kHz the roll-off is 3rd order.

http://www.zaphaudio.com/ Have a good rummage around this site.

/sreten.
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