After emailing Douglas regarding cabs for a pair, he recommended two cubic foot sealed boxes. I prefer a sealed alignment. I have dimensions for such boxes. Has anyone tried this? If so, what about off-setting the driver? If so, how much? BSC correction? How wide the baffle?
I’ve built several pairs of speakers, but this is a new one to me in that it’s a “large” single driver in a large sealed box. I have also never dealt with BSC.
Regards,
Karl
I’ve built several pairs of speakers, but this is a new one to me in that it’s a “large” single driver in a large sealed box. I have also never dealt with BSC.
Regards,
Karl
Freddi -
Thanks very much for the sim.
I’m considering a pair of Altec 618 clone boxes. I have a carpenter whom I think would make them for me.
Thanks very much for the sim.
I’m considering a pair of Altec 618 clone boxes. I have a carpenter whom I think would make them for me.
Big sealed boxes were the first thing I tried with the speakers that later became the BetsyK. (To be honest, the first cabs for them were an old pair of CL Sansuis with the drivers pulled out and a piece of MDF screwed right over the top of the original baffle.) If you don't want to use BSC, you definitely want something like that Altec box placed close to boundaries.
If you can tolerate some size and width but want something simple, GM posted a big triangular TL for them quite a long time ago. I'm not sure anyone has ever built it, but it promises more bass than a sealed box.
Paul
If you can tolerate some size and width but want something simple, GM posted a big triangular TL for them quite a long time ago. I'm not sure anyone has ever built it, but it promises more bass than a sealed box.
Paul
Perhaps I’m missing something - The response in that box looks pretty bad in that it drops off very quickly after 1000Hz. That not full-range.
hornresp only considers power response - not what can happen with narrowing dispersion or breakup region. On, axis the published graph is pretty much what I saw my Betsy-k mounted in a 28 inch tall by 12 inch wide Karlson - box - imo, BetsyK has a nice sound on vocals in general.
Hi freddi,
For multiple-segment horns yes, but not for other loudspeaker types 🙂.
The attachment shows the on-axis pressure response for your 2 x Pi direct radiator example.
Kind regards,
David
Attachments
Hi freddi,
Calculate the standard power response then select Tools > Directivity > Response, and specify the desired off-axis angle. The default value is zero, which gives the on-axis pressure response. There are five directivity tools that you can play with - have fun 🙂.
Kind regards,
David
Attachments
thanks - does that also work for vented cabinets? Regarding front loaded horns, must there be just one segment in the model for the directivity function to work?
The directivity tools work for the individual outputs of a vented cabinet (i.e. the direct radiator output and the port output) but not for the combined output. A front loaded horn must have only one segment for the directivity tools to work.
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