| Slot loaded woofers [message #61193] |
Fri, 16 October 2009 01:56  |
Bellini
Messages: 2
Registered: October 2009
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Esquire |
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I am working on a three way design to be used with subs for band PA purposes. I want the box to be as compact as possible. Each cabinet will contain 2x Eminence Kappalite 3015 woofers, 2x Eminence Delta pro 8B Midrange drivers, and a 1 inch compression driver on a small 60x40 horn. My desired crossover frequencies are: 400Hz between the lows and mids, and 3KHz between the mids and the highs. The enclosure will be vented, and I will need it to play down to just 70Hz. I realized that I could make the cabinet fairly short and narrow by slot loading the woofers. I would use two slots, one at the top, and the other at the bottom of the cabinet, similar to what Renkus-Heinz did with some of the cabinets in the CT line. http://www.renkus-heinz.com/loudspeakers/series/Legacy_Loudspeakers/ct_install/images/hi_res/ct7215_photo.jpg
Does anyone see any possible problems with this arrangement for the woofers that would make it not worth trying?
Thanks,
Bellini
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| Re: Slot loaded woofers [message #61200 is a reply to message #61199] |
Fri, 16 October 2009 23:41  |
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Wayne Parham
Messages: 18791
Registered: January 2001
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Illuminati (33rd Degree) |
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I agree with you. I built a push-pull hornsub and the summing is in the throat, so very close acoustically. Naturally the reduction of distortion is excellent in this configuration.
I considered also building a smaller version of the same horn, basically 1/2 of the push-pull model. My thought was to make two versions, one with the throat driven by the cone face and another with the throat driven by the cone back. Each would have identical front chamber volumes, rear chamber volumes and flare. By stacking the mouths together, it would also be push-pull, but coupled at the mouth, which is acoustically distant through most of the passband.
I would expect distortion reduction to possibly be as good at the lowest frequencies, but maybe not as good as frequency went up. My expectation is there would be some degradation of performance but the advantage in the trade is it would make a smaller package, easier to move around. I really would like to know how much difference there is, so one of these days, I'll probably get around to building it. But the hornsub I did already was a very ambitious project with a lot of R&D over a long period of time. It's not a trivial design, certainly not a weekend project.
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