What is this subwoofer alignment?

[IamJF]

Of course it depends on your usecase. In an Array of 12/16 subwoofers this might summ up and the working frequency goes down. And you probably even add some sub sub woofers to fill the lowest frequencies.
But standing for it's own, 2-4 of these ... I would push it towards marketing.

 

[Brian Steele]

A 4th order bandpass sub uses a rear sealed chamber and a front vented chamber, it rolls off at around 24dB per octave both above and below it's bandpass.

For a 4th order BP, the roll off on each side of the passband is closer to 12dB/octave.

A 6th order BP can have a 24dB/octave roll off on the low side and 12dB/octave on the high side, but I've designed a few that have roll offs closer to 18db/octave on either side of the passband.

 

[tktran303]

well here’s the ad copy for the product:


Reference:
https://www.pioneerproaudio.com/en/products/xy-series/xy-3b

I get a sense it’s marketing.
Particularly that colour of that waveguide does nothing, apart from appealing to traditional aesthetic values of the East and South East Asia, which is probably an emerging market for Pioneer…

 

[IamJF]

Used for a low midrange it changes the frequency range ... and so it can make sense with some tight parameters!
*) You maybe get less vertical dimension - less beaming.
*) The gain is in the frequency range of the drivers!
But you will need the most SPL at the lower part of the range - so it doesn't help at all when you use this fullrange but with subwoofer and crossed over not to deep it can help.
*) After all it looks very professional ;-)