>> i was doing 48khz sample rate while the xta is native at 96k.
>> Do i need to redo my measurement as well in 96k?
No, just change the sample rate in FIR Designer to 96 kHz and check the Export tab – you’ll probably need to double the filter delay and length settings to match the time intervals at 48 kHz – then export the filter again.
>> …. are these correct?
Yep, I think that’s a good starting point. We have tutorial showing a 2-way design with only FIR at
This is just one approach to doing a FIR 2-way. Like I said above, another way is to do a regular IIR crossover design, then measure the whole cabinet and create a single FIR correction filter for the whole speaker. Some processors can only do a single FIR before crossover. Some can run a FIR for every output.