24dB/oct Linkwitz–Riley crossover with 4-gang potentiometer

[saint gillis]

Hi,
This is a common circuit for making a 24dB/oct Linkwitz–Riley 2-way crossover :

DBX in their 223/224 series seem to use 4-gang potentiometers for tuning the crossover frequency from what I see on a youtube video, how's that possible?

 

[JohnRoberts]

The 4 pole LR alignment is effectively two 2 pole Butterworth filters in series.

I made crossovers back in the 70s/80s that were switchable between 3 pole and 4 pole response.

I had my technician tweak the tracking of the 4 gang alps pots to be close at mid rotation.

JR

 

[mskeete]

Here's a rane note that shows how it can be done with a 4 pole SVF

https://www.ranecommercial.com/legacy/pdf/linriley.pdf
Mark

 

[saint gillis]

Here's a rane note that shows how it can be done with a 4 pole SVF

https://www.ranecommercial.com/legacy/pdf/linriley.pdf
Mark

Brilliant, thank you.