I think it is no secret that the 4365 is voiced for the Japanese market and rice walls!
They sounded to thin for me. Male voices for example. And I lacked bass. I have had subwoofers before, JBL Array 1500 and JBL TiK
I also lacked details. The speakers before at my home were Burmester 961 mk3 with AMT tweeter.
With the active crossover, I have implemented the 8db augmentation of bass from around 135Hz (if I remember correctly) and down just like the M2-crossover. This made it sound exactly like I wanted in the bass-region! I also took away the large roommode I had with the PEQ.
I have tried to roughly implement the JBL target housecurve. This could be tweaked on forever, but I am very satisfied right now.
I have not tried to timealign at the crossover point yet with delay. This will make it sound even better.
When going active it was like an very thick veil was removed from the sound.
Much more dynamic sound as well.
I have DIY Hypex nCore amplifiers (class-d 400W). Oppo BDP-105 source. DBX 260 Driverack. Fully balanced signal chain.
One thing that I did not expect was that just introducing the driverack in the signal chain improved the sound. I thought it would degrade the sound a little bit. Probably it can drive my long signalcables better than the Oppo.