Beyma 12CXA400fe coaxial. Enclosure build

I'm a bit confused about the graph though, the dB axis looks to be scaled all wrong.

me too.  i thought the shape was cool and the ceiling mount was nice too.

didn't like the ports though.

sometimes a straight port with no flare is OK and this depends on box tuning and what frequencies are fed into the box.  

so with subs for example we can use long ports without exciting port resonances and that allows us to use wide enough ports that we don't need flare.

with tops that are meant to work with subs we can tune to a high frequency and that allows us to use short, wide ports that again doesn't cause issues.

but if you're in a difficult situation where you need to tune low but at the same time you will be feeding frequencies way above subwoofer into the box you risk coloring the sound with port resonances and to avoid this you will want to make the port shorter and therefore narrower which will push air speed up at which point you will likely want to add flare to the ports ( if round ) or if rectangular then have a variable cross section to the port that is narrower in the center and wider at the edges ...

with this particular enclosure shape it would be impossible to put flared ports on the back because it wouldn't mate to the non-flat surface, but it was still possible to put them on the bottom, which is what i suggested for any possible future iteration of this design.

and i love Beyma and i'm bipolar myself - my point is simply that Beyma is all over the map from leading the industry with drivers like TPL to knocking off obsolete JBL designs with their bullet tweeters to again leading the industry with technologies like MaltCross to again making ostentatious car-audio-centric woofers with carbon fiber cones etc.  you never know what to expect from Beyma

by contrast with B&C you can always expect a boring but functional product.

the way it was explained to me on another forum is that B&C basically owns the Prosound market in Europe while other companies like Beyma, Faital, 18 Sound etc. must look for openings / opportunities to create something unique in some Niche B&C hasn't occupied yet, which is why they often come out with interesting but also strange products while B&C products always make sense but are rarely exciting.