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In Reply to: RE: OB horn project completed posted by Joseph Crowe on June 01, 2014 at 21:22:02
One concern I have is that when only making a horn for the front side, that you will be loading the driver asymetrically. I am contemplating something like that and I am considering adding a horn for the backside of the driver (or use some other way to load the back side of the driver).
Do you think that asymetrical loading of the driver is a problem?
Retsel
Follow Ups:
Forgive me if the following makes me sound like an ignorant fool. It is not based on knowledge but instead on imagination and visualization.
It seems to me that when the cone travels forward it is pushing the air in the horn, and when the cone travels backwards it is pulling the air in the horn. Back loading such as a compression chamber can increase sensitivity and prevent out of phase acoustic cancellation, but isn't strictly needed to prevent asymmetrical loading of the driver.
My thoughts precisely. There is a little bit of foam in the back chamber and I think the manufacturer does everything reasonable to mitigate back wave reflection. To go the extra mile and if room allows I think a long tapered tube would virtually eliminate the back wave. And as a bonus the FS of the driver would be reduced. Just the same as putting a woofer in a small sealed box raises the system FS, by increasing the back chamber volume and venting it, I think the inverse would happen, a reducing of the FS. Question being, would this allow more usable low frequency output from the compression driver. Well, that would be an interesting experiment. A quick test on my DATS system and observing the phase plot would reveal this pretty quickly.
I don't consider anyone an ignorant fool, although some are better educated than others.My question is inappropriate in that this is a compression driver, not a conventional driver.
Retsel
Edits: 06/09/14
It would be pretty hard to load the opposite side to the same degree because the phase plug provides a huge amount of compression. But I understand where your coming from. I've always thought a long tapered tube with damping material to act as a transmission line to dampen the back wave would be ideal. But your saying instead of killing it why not use it almost like a bipolar horn. If the sound from the back horn was decent enough, it would be very challenging to design a phase plug that time aligned a convex diaphragm.
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