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-   -   Crossover questions (https://www.diyaudio.com/forums/multi-way/342545-crossover-questions.html)

kawihornet 10th September 2019 09:10 PM

Crossover questions
 
1 Attachment(s)
Please check out the attached picture

I'm curious how the components work?

Thanks so much!

Galu 10th September 2019 09:50 PM

I'm curious as to the origin of this circuit.

Draki 10th September 2019 09:53 PM

Deep EQ notch in the tweeter leg (possibly quite high Q, can't tell w/o values).

kawihornet 10th September 2019 10:15 PM

Quote:

Originally Posted by Draki (https://www.diyaudio.com/forums/multi-way/342545-crossover-questions-post5911053.html#post5911053)
Deep EQ notch in the tweeter leg (possibly quite high Q, can't tell w/o values).

Values are listed?

kawihornet 10th September 2019 10:16 PM

Quote:

Originally Posted by Galu (https://www.diyaudio.com/forums/multi-way/342545-crossover-questions-post5911050.html#post5911050)
I'm curious as to the origin of this circuit.

Dynaudio Special 40

A guy in the Diy group drew it up for me.

kawihornet 10th September 2019 10:42 PM

Im really curious why C3 is used?

Dissi 10th September 2019 11:49 PM

Hi,

The bridge topology L2-C3 and L3-C2 actually is a passive delay network (Lattice phase equaliser - Wikipedia). :)

David Morison 11th September 2019 10:16 AM

Quote:

Originally Posted by kawihornet (https://www.diyaudio.com/forums/multi-way/342545-crossover-questions-post5911071.html#post5911071)
Values are listed?

Not the inductor values, which is what I presume Draki meant.

YSDR 11th September 2019 10:27 AM

So this is a 1st order filter topology in Dynaudio's view?:rolleyes:

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

wolf_teeth 11th September 2019 08:13 PM

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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