Whilst I hesitate to use the word 'waveguide' in case I upset Earl, I can't think of a better term in this case.
So I have a pair of apogee centaur minors with the 26" ribbon handling 1k upwards. I'm planning the slow process of taking them active and dropping the crossover to around 750Hz but keep looking at them and realising that the mounting seems to just be what was quick to build with a router rather than a conscious design for pattern control. It seems some work has been done on waveguides for smaller ribbons, but nothing for these big ones. Not suprising I guess as you couldn't really fit anything onto the full ribbon models in the range.
So I need some pointers where to look. I know any implementation will be a compromise but trying to get a feel for what (if any) gains there might be. Can I assume a ribbon can be treated (at least in the horizontal plane) the same as a circular drive unit for analysis. If that is the case at least I can at least use standard texts to start to understand (or short term find out what I don't know).
So I have a pair of apogee centaur minors with the 26" ribbon handling 1k upwards. I'm planning the slow process of taking them active and dropping the crossover to around 750Hz but keep looking at them and realising that the mounting seems to just be what was quick to build with a router rather than a conscious design for pattern control. It seems some work has been done on waveguides for smaller ribbons, but nothing for these big ones. Not suprising I guess as you couldn't really fit anything onto the full ribbon models in the range.
So I need some pointers where to look. I know any implementation will be a compromise but trying to get a feel for what (if any) gains there might be. Can I assume a ribbon can be treated (at least in the horizontal plane) the same as a circular drive unit for analysis. If that is the case at least I can at least use standard texts to start to understand (or short term find out what I don't know).
Well, there are a few pro audio ribbon waveguides (and maybe full on compression drivers). Argh, can't remember the name of one in particular, Dutch.
The ribbon is more or less a line source (not at low frequencies, and maybe not at very high frequencies either if the ribbon itself is wide).
Maybe Akabak can model something like this. It would be interesting to use a ribbon to feed an actual horn.
The ribbon is more or less a line source (not at low frequencies, and maybe not at very high frequencies either if the ribbon itself is wide).
Maybe Akabak can model something like this. It would be interesting to use a ribbon to feed an actual horn.
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