This looks an EE‘s approach who hasn’t had a lot of exposure to speaker design. You need to consider Thiele/Small parameters of the chassis, enclosure volume, baffle design and a million other factors to design a proper crossover. You can’t just ltspice your crossover and call it a day. VituixCad would be a more appropriate solution.
And then you actually have to measure!
Replacing and amp and „smart“ crap is easy if there is an analogue crossover you can reverse-engineer, if it was just some DSP things get difficult quickly (unless its just a single broadband chassis, but even then…).
And no, you can’t use pre-built „standard“ crossovers or some calculator on a website either.
But other than that, nice that he saved some hardware.
Replacing and amp and „smart“ crap is easy if there is an analogue crossover you can reverse-engineer, if it was just some DSP things get difficult quickly (unless its just a single broadband chassis, but even then…).
And no, you can’t use pre-built „standard“ crossovers or some calculator on a website either.
But other than that, nice that he saved some hardware.