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Old 27th September 2008, 03:37 AM   #11
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And the driver excursion for the above.
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File Type: gif vb excursion eo-18c.gif (21.1 KB, 182 views)
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Old 27th September 2008, 05:21 AM   #12
dangus is offline dangus  Canada
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If you've got good recordings of the band, play them through a real-time analyzer and see just what frequencies are there. No sense paying for sub capabilities that aren't needed.

Take a look at some horn designs as well. Having a chest-crushing kick drum may outweigh the lack of wubba wubba infrabass when it comes to pleasing the crowd.
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Old 28th September 2008, 12:56 AM   #13
GM is offline GM  United States
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Originally posted by ted01

More box volume = lower freq. but with less power. So if I want to get down low, I need a big box, but can't shoot lots of power to it.
Right you are. Here's a simple tapped pipe (6th order BP) half space sim with ~30 W input to hit Xmax @ 20, 33 Hz, but it's ~411 L net:

Unfolded length = 333.5 cm/131.3"
w x d = 1232 cm^2/190.96"^2

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Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
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Old 30th September 2008, 12:15 AM   #14
pjpoes is offline pjpoes  United States
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well whats been said about xmax is still very important to consider. I wouldn't say that xmax is the only determining factor in spl, some modern woofers have more xmax than power handeling (TC sounds and Adire were often that way), but in the Pro driver world, its mostly true. Unfortunately the driver you have simply is not a good subwoofer driver, regardless of the enclosure used. While some designs will do a better job controlling xmax at the lower frequencies (ported, TL, and horn), none will be able to control it enough to be truly usable as a subwoofer at 25hz. An examination of that drivers xmax across frequency shows a massive increase well beyond its limits at far too high a frequency. Adding mass to the cone helps, but you then have some issues with a loss of efficiency. If you are unwilling to consider selling those drivers and trying something else, then you will have to accept that you will not have very great output in the sub bass range of 20-30hz.
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