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In Reply to: Re: DDS Eng1-90 to 15" Woofer? posted by Don M on February 25, 2007 at 11:07:19:
It's a double edged sword. The narrower the slot the less beaming, but at the same time the air mass within the chamber increases. That chamber acts as a low-pass filter, so you get wider dispersion but at the same time reduce HF extension. The way to get around that is to move the slot back, closer to the cone, to minimize the volume of the chamber between the cone and slot opening. I've incorporated just that feature into the horn throats of my two latest designs.
Follow Ups:
Hi,I'm not able to interpret your recommendation "The way to get around that is to move the slot back, closer to the cone, to minimize the volume of the chamber between the cone and slot opening."
Does this mean placing the waveguide closer to the woofer cone on the front baffle?
Thanks,
"Does this mean placing the waveguide closer to the woofer cone on the front baffle?"
Yes. Think of a cone shape that fills the volume between the baffle and driver cone, with the aperture going through it.
hi Bill - I think Don M is referring to "time alignment" of the DDS conical waveguide vs his Altec's 416 plane while you're discussing a phase-plug-like adaptation of a rectangular diffraction slot to cut down on cavity resonance and path errors:^)
best,
Freddy
I initially was commenting on your measured results with versus without the lens, assumed he was doing the same.
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