HF146 on XT1464 2-way ideas - what cone driver(s)?

Thanks for the suggestions and sharing of your findings in similar designs, I will not be able to keep up with the standard 50Hz or higher tuned BR solutions in SPL, for sure not, the driver I have decided to use might but not when deployed as I have been thing about, that is a 0.55-ish Qtc closed alignment.

If high SPL capacity was the goal however I would opt for BR, no doubt, cooling and excursion would be the prime motivators, but even in that case I keep banging my head against the particle velocity issue if tuned usefully low for stand alone applications, it is a far better approach in that case to go for a higher tuning at which point the the port area can be increased while keeping the length manageable, that is if the simulations are correct in predicting the velocity.

This will be a SQ oriented design rather than a high SPL one, I hope the HF146 on the XT1464 is a good sounding combination, reviews seems to indicate this, and it is good to hear that it can manage around 1kHz XO, as for the B&C 15NDL88 the opinions are scarce (I have not found anything on this driver) but I have a great deal of confidence in the brand from previous experience and the parameter balancing seems promising.

I think this may be a bit of an odd creature given the nature of this forum if what I'm thinking right now becomes reality, a sort of new oldschool design meaning a wide baffle, shallow and trapezoidal enclosure, think JBL SR47XX series and similar but with a hint of modern elements, something just feel right about it, to me at least.

have you tested at high volume? would have thought first order filters will put too much power through to the tweeter at resonance and to the mid at break-up frequencies. that tweeter has resonances within an octave of your crossover frequency iirc - second order filter at least is needed.