Hi everyone !

I am currently equiping some loudspeaker case, and I dont have any kind of active crossover at the moment. In order to test my speakers I would like to send them an audio signal from my computer that I would filter up with a pd patch using jack. I know about lop~ and hip~ object in pd vanilla but more complexe filter like Beseel, linkwitz and riley or butterworth filter seem only to exists in pd extended. I tried to get extened on my laptop but due to some depedencies clash I couldn't do anything. Is there a way to simply add the filter object of extended in vanilla ?

Thanks in advance for your answer.

@lysergik iemlib has both Bessel and Butterworth filters in many configurations, and you could make your own Linkwitz-Riley with the latter. Go to Help->Find Externals and enter "iemlib".

https://github.com/solipd/AudioLab in this repository, there is a vanilla butterworth filter

@jameslo I did install ieamlib as you said, got to my preferences to have iemlib at launch, git the message in pd console saying iemlib was launched. But when i try to create a bessel or butterworth filter pure data act like it doesn't know the object i'm calling. I don't know what is wrong with iemlib.

@tungee Thanks a lot it works well, anyway I got some kind of crackling on the high frequency canal, do you know how to fix that ?

@lysergik try [declare -lib iemlib] or add iemlib to preferences > libs and preferences > searchpaths

... also a Butterworth vanilla abstraction made with [cpole~] is used in PD's example patches 3. H13 and 3. J07

Hi everone ! I finally got it ! I've just reinstall iemlib with deken, I just have to tick the boxes that says add the path during installation and everything works now. I could run a fine test of a crossover patch with my sound system. It was fun !

butterworth/linkwitz is not difficult for biquad~