Originally Posted by Berland
Isn't it easier to do REW measurments? No need to stick with anyone elses findings. Measure yourself with REW and you will find the perfect crossover.
You can get something functional on your own, and you might get lucky, but if you want the speaker to be properly optimized, especially off axis and attenuating out of band peaks or similar non-obvious details, use the designed active crossover. Particularly with a speaker integrating a waveguide and large diameter woofer, it's very unlikely tinkering with REW in-room would result in something better than starting with the optimized speaker and then using Trinnov's room correction to adjust it as a whole element.
Interestingly I see the Trinnov won't directly allow you to enter the crossover as described above. If you want to include the 6 filters in the P4 block that apply to the combined result, you will have to copy those to both the high pass and low pass output, as there is no programmable PEQ on the input. If you aren't having Trinnov correct much of the upper range, you would definitely want those in the loop, and would be worthwhile even using full range correction.
The other option is to use the digital outputs direct to an amplifier with digital inputs and internal DSP to handle the crossover.
While the active speaker crossover function in the Altitude has many adjustments and can take a measurement, I would argue it is not well suited for "designing" the crossover in-room for most conventional speakers, while possibly a lower bass crossover below 500Hz might be straight forward enough where measurements and room correction will be plenty relevant, but even there you have to understand the on-off axis behavior of the speaker and how the crossover design choices impact that. In the vast majority of cases you want a solid starting point of PEQ, HP/LP, level, and delay settings from the speaker's designer.