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Honestly a crossover designed from a formula has very little chance of working well
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I guess you could always use REW to check whether a filter worked properly as calculated.
If I loop a cable from output to input on my soundcard and then in REW clear C-weight and meter files, but leave the soundcard calibration file, then that loopback cable should measure a flat frequency response.
Then if I break that cable out so I can connect a passive circuit in series with the loop, I can plot its response.
I calculated a simple passive RC 1st order high pass filter with a C = 0.1uf and an R = 22K, I get a calculated -3dB down fc of 144Hz. So if I test at 75dB, the filter should show 72dB at 144Hz.
So I test it out (I tested 10Hz to 10KHz with a 512 sweep duration x4) and my results are 72.3Hz at 144Hz.
Pretty close...................
hpf.jpg
brucek