So, now it's time for the criticism of the targeted crossover frequency of the bass module or the bass module itself.
Roughly above 150-200Hz, the directional localization works quite well. That means at a crossover frequency of 500Hz, the three front woofers (W1-3) play with the same sound pressure level and the sound localization will most likely fall on woofer W2 - that's bad.
Therefore, the woofers W2 and W3 should actually play a bit quieter than W1 or show a steeper filter slope so that the localization is as close as possible to W1, i.e. the 2-way speaker top.
Update: I have deliberately not taken into account possible ground reflections - this makes the whole thing even more complicated.
Roughly above 150-200Hz, the directional localization works quite well. That means at a crossover frequency of 500Hz, the three front woofers (W1-3) play with the same sound pressure level and the sound localization will most likely fall on woofer W2 - that's bad.
Therefore, the woofers W2 and W3 should actually play a bit quieter than W1 or show a steeper filter slope so that the localization is as close as possible to W1, i.e. the 2-way speaker top.
Update: I have deliberately not taken into account possible ground reflections - this makes the whole thing even more complicated.