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Multi-Way Conventional loudspeakers with crossovers

Crossover questions
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Old 10th September 2019, 09:10 PM   #1
kawihornet is offline kawihornet  Canada
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Default Crossover questions

Please check out the attached picture

I'm curious how the components work?

Thanks so much!
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File Type: png dynaudioS40.png (21.6 KB, 128 views)
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Old 10th September 2019, 09:50 PM   #2
Galu is offline Galu  Scotland
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I'm curious as to the origin of this circuit.
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Old 10th September 2019, 09:53 PM   #3
Draki is online now Draki  Macedonia
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Deep EQ notch in the tweeter leg (possibly quite high Q, can't tell w/o values).
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Old 10th September 2019, 10:15 PM   #4
kawihornet is offline kawihornet  Canada
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Quote:
Originally Posted by Draki View Post
Deep EQ notch in the tweeter leg (possibly quite high Q, can't tell w/o values).
Values are listed?
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Old 10th September 2019, 10:16 PM   #5
kawihornet is offline kawihornet  Canada
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Quote:
Originally Posted by Galu View Post
I'm curious as to the origin of this circuit.
Dynaudio Special 40

A guy in the Diy group drew it up for me.
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Old 10th September 2019, 10:42 PM   #6
kawihornet is offline kawihornet  Canada
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Im really curious why C3 is used?
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Old 10th September 2019, 11:49 PM   #7
Dissi is online now Dissi  Switzerland
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Hi,

The bridge topology L2-C3 and L3-C2 actually is a passive delay network (Lattice phase equaliser - Wikipedia).
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Old 11th September 2019, 10:16 AM   #8
David Morison is offline David Morison  Scotland
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Quote:
Originally Posted by kawihornet View Post
Values are listed?
Not the inductor values, which is what I presume Draki meant.
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Old 11th September 2019, 10:27 AM   #9
YSDR is offline YSDR  Europe
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So this is a 1st order filter topology in Dynaudio's view?

It looks more like a typical 2nd/3rd order electrical -> 4th order acoustical crossover with some timing compensation, which are also supported by the measurements.

Specs:
Special Forty anniversary standmount speakers - Dynaudio

Measurements, look at the typical 2-way 4th order step response:
Dynaudio Special Forty loudspeaker Measurements | Stereophile.com
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Old 11th September 2019, 08:13 PM   #10
wolf_teeth is offline wolf_teeth  United States
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The woofer has a damped 12dB electrical network (ie- coil plus zobel), and the tweeter has a 1st order electrical with ladder delay plus some padding and a tilt down via the CR filter.

The CR in front of the circuit 15uF/22 ohm lends to having a rising system impedance without it. With a CR across both the woofer and tweeter, this would not be the case, save for a lowpass induced rise or an impedance peak at Fo in lieu of the xover. Having that CR directly across the amplifier terminals should likely have a higher power resistor in tow to keep it from over heating. I would think those 2 components could be omitted as all they are doing is changing the impedance of the system. Typically an LCR is used for this purpose to suppress xover impedance humps, and far reduced bandwidth flows through the circuit if a LCR vs a CR is used.

Later,
Wolf
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