Testing the Active Crossovers for my 10 Channel Amp

These crossover boards are a key component in my 10 channel amp build, and I have to make sure the board layout works properly before I order the professionally made PCBs.
Each board contains an input buffer, a two stage high pass filter, a two stage low pass filter and an output buffer that has some gain and also has a trimpot to adjust the output level.
Credit and thanks to Rod Elliott's excellent website for this design: https://sound-au.com/project09.htm. His site is a wealth of practical knowledge and projects that I've been using for nearly 20 years. The linked article has a detailed description of how the crossover works if you want more info.
The filter stages combine for a 4th order slope on the high pass and low pass, letting a limited range of frequencies through. In this example, the board is set to drive the woofer of my 4 way speakers from 80Hz to 350Hz. Another board will drive the midwoofer from 350Hz to 900Hz, and so on.
There will be 10 of these, one for each individual amplifier board.
Testing was done first with my scope just to check if it actually works. While the circuit design is proven, the wildcard is the board layout and whether I made any mistakes doing that.
I then set up my computer to run REW to measure the frequency response. This is done in a similar way to measuring a speaker (or room), except instead of using a microphone, the signal is fed directly through the crossover board.
As shown in the video, the measured response very closely matches the simulated.
The next step is to finalize the board layout and order the boards, and then I can start putting the amp together.
Active vs passive: is a topic for another video.
You can watch part 1 in this series here:
   • Designing and Building a 10 Channel A...  

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