that's interesting, but he just ignored the lows, i wanna see he make low directionals also, then you have a product
I work in the Spanish distributor of a PA systems brand called Nexo, and it's pretty interesting the work they have done for controlling sound direction. They invented some directional subwoofers, cardioid and super cardioid, one also made for array systems. Using a second speaker in the same enclosure, but changing the phase of one of that speakers, they make it work in directional mode, that's useful live so you don't get those frequencies on the stage, so micing things up is more comfortable so you can avoid some feedback.
In the array version, they use a 18" frontal speaker, and 2 12", one on each side, so also changing the phase of the 12" speakers you make it directional.
Also for other array enclosures, they invented a hyperbolic reflector for the high frequencies.
I copy an explanation from their website:
"The Hyperboloid Reflective Wavesource controls the spherical expansion of the acoustic pressure wave using an acoustic mirror instead of coercive side walls. The HRW is more accurate than conventional waveguides, and multiple HRWs can be combined without interference or loss of coherency since the hyperboloid acoustic mirror has a virtual source behind the speaker enclosure, as well as a real source inside the enclosure."
Also they made a directivity phase device, which is a piece in front of the woofer, that makes all woofers in the array match perfectly without interference.
Also a better explanation from the website:
"The Directivity Phase Device or DPD enables multiple woofers to couple effectively at higher frequencies than would be possible with simple direct radiating cones.
The CDD Configurable Directivity Device alters diffraction slot dispersion so that the GEO wavesources exponential flare control dispersion in the non-coupling plane. "
So, in an array like this one, you have perfect matching between all the cabinets without interferences between them. Also, adjusting the angle of every cabinet, you can cover all the crowd in a gig in zones, so every cabinet is covering a sector of the place. The idea is to have the same pressure level and audio quality in every spot of the venue, while with some speakers at the side of the cabinets, you make them directive, so the sound don't get on the stage, so it's easier to mic and make the monitor mix.
I've been working in this distributor for nearly a year, and you learn a fucking lot about this stuff, it's really interesting to read about it, it's impressive the big amount of time the engineers that invented that spent making computer simulations to design this devices.
