Just make consecutive measurements of all drivers, midbass and sub without any EQ and crossovers (and after that with everything turned on) at the same volume level and then save the measurements.
You will have lots of measurements in the left part of REWs window and they will all have the same relative volume and in the "All SPL" tab you can then see the acoustical crossover.
Basically, yes.I have no idea why the response spikes at 35hz. I honestly didn't even give it a second though because it was out of the speakers range. Could it be noise from outside the car? I'm measuring with a UMIK-1 using the 90deg calibration file.
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Raise the volume on the headunit.
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I think I understand what you and jrwalte are try to say. I should try using -12db and then tune within REW to a -24db slope using the selectable settings? If that doesn't work I should move the cutoff down to 70 instead of 80?
And that's what you need the measurement without crossovers and EQ for.
In REWs EQ window you can then try different crossover simulations to bring the slope near the desired ideal slope of the target curve.
The acoustical curve should be a LR24db as this gives the least problems with phase in the crossover region. Two acoustical LR24db slopes will be in phase in the crossover region.
But, you can surely use a BW12db electrical filter, or an 18db filter, or a 12db LR or whatever make the acoustical measured slope match the desired acoustical slope. By doing this you may achieve lot less EQ in the crossover region.
Ideally you want to use the same crossovers on both sides, but it may be that you have to use different crossovers for your left and right midbass.
If the acoustical crossover matches this shouldn't be too bad, although it is not ideal in my opinion.