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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place. |
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In Reply to: Re: Anyone know dimensions for Olson rear horn rectangular enclosures? posted by gopies on January 30, 2007 at 03:13:16:
JohnWAF* is inversely proportional to cabinet size. Another way to approach the design is to assume a listening level height, let's say at 42". If you put the center of the 15" driver at this height, you would wind up with a cabinet about 52 1/2" high and about 29" wide, with the baffle step coming in around 157 Hz. Another way to address that baffle step is to angle the cabinet front sides back at a 45 degree angle, which you can do by cuting into the top manifold section. There should be no consequences to this as this horn expansion is a rather "geodesic" approximation anyway. If you get the front baffle (where the 15" mounts) to be about 24' wide, this would put the baffle step (at least at this position) at about 190 Hz, right near the projected crossover region of the direct radiator and rear horn. The 42 Hz Fs of your driver and the size of the horn mouth will be the limiting factors in the bass. You can calculate the baffle step by this: F= 4560/W. This is where F=the freq. where the bass will be 3dB down, and W=the baffle width in inches. The horn length tends to follow from the type of horn expansion chosen, which is then adapted to the horn mouth and throat size for the application at hand, and it's somewhat negotiable as you can see if you have been following various recent comments here concerning this. To visualize the various wavelengths you are working with, use 13500/F=W. This is where 13500 is an approximation for the speed of sound in inches per second, F= the frequency, and W=the wavelength in inches. BTW, check your mail.
We like enthusiasm here!
Paul
*WAF=wife acceptance factor, the bane of the horn designer.
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Follow Ups
- Re: More ideas... - Paul Eizik 16:00:25 01/30/07 (2)
- Re: More ideas... - gopies 04:24:43 01/31/07 (1)
- Re: More ideas... - Paul Eizik 10:05:47 01/31/07 (0)
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