[LAU] How do I create a FIR-filter with opensource tools?

Hi!

Recently found

"Camilla-DSP" https://github.com/HEnquist/camilladsp

It's "a tool to create audio processing pipelines for applications such 
as active crossovers or room correction."
I wanted to try out the room correction, but I have to create FIR 
filters for my speakers. And this is where I got stuck.

My setup is as follows:

Ubuntu Studio 24.10
RME HDSP 9652 (output 1-8 = 4xHeadphone, output 9-17 connected with amp)
Dayton Audio 12-channel Amp (channel 9/10 not connected)
4 2-way-speakers (LF/HF), each chassis directly connected to the amp 
(channel 1 - 8)
1 Subwoofer, directly connected to the amp (channel 11/12 bridged)

Tried to use REW, but I can't make it behave like an usual jack 
application ("use input 1, output 9"), instead it deals with cryptic 
sorround nomenclature and doesn't show up on qpwgraph…

Now, as I understood it right, my steps are:

* Sending a sweep to every speaker chassis, each, and record the output 
(of each one) through a measurement microphone. (Measurement samplerate 
= playback samplerate)
* "Invert" each file
* Make use of those files in "Camilla DSP"

Steps missing? Or am I totally wrong, here? What tools can I use?

Of course I have to limit the sweeps to frequencies and levels the 
speaker chassis will survive…! (Especially for the Tweeters)
But one thing I don't understand is how the crossover frequencies are set…

Maybe someones able to turn the light on…

Thanks!
And greets!
Mitsch
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