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In Reply to: RE: VOTT Cabinet Efficiency Increase posted by BR on August 31, 2007 at 07:48:54
An Altec 515 woofer is more sensitive than the 416. IME the 515 (515B)will give you a little better midrange but less bass depth.
Note that the 825-828 VOT cabinet gives a stepped response with the horn loaded region above 125-150 hz several db higher in sensitivity than the region below which is vented. With a 416 woofer you may well be up around 105 db above 150hz.
Follow Ups:
I was just searching the web looking for a drawing of a A-7/ 828 cabinet.
While listening to my A-7's with a sub. I got down to listen to the vent port to see how much low end was coming out. I was surprised to hear so much volume but sounded boxy and sloppy.
Then I had this hairbrain idea to make the lower part of the cabinet into a scoop like BLH. I've got a pair of Altec 805's in BLH that sound pretty good. I like the bass in that BLH very smooth and deep.
What do you guys think would there be any advantage to Scoop-ti-fying the the A-7 cabinet?
Have fun
Willie
I did the exact same thing around 25yrs ago. The application was PA usage for sidefills. There was no "science" behind it, but I did not use the front panels on the cabinet.
I simply expanded the area under the driver downwards to the bottom and then back up for the full now open area on the bottom of the cabinet.
The only thought was to keep the "horn" expanding. It sounded fine, but I have no real information on performance, so no comment on the idea, except it worked for me, but I'm sure there were all sorts of issues with it.
Here is a photo I found of the cabinet in question. They are the bottom cabinets on each end.
Either extensively brace the cabinet, resize the vent and add some additional damping inside, or use the lower section to install an 18" driver as a sub.
I think Tom has some experience with the both of those approaches, so he could elaborate on the 18" idea.
Why reinvent the wheel? If you want a scoop cabinet, build the old JBL PA scoop design. Those still really only work to 40-50Hz. To go deeper you need something altogether different.
eso
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