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Adire Tempest Downfiring Ported Subwoofer Project : Polyfill Concerns
On 22 Dec 2003 11:34:29 -0800, (bsguidry) wrote:
As far as mounting the driver for a vertical alignment, I'd like to
know more why I'd appreciate this design in 10 years. Unfortunately,
I have two toddlers who haven't learned to keep out of my
electronics. Having the sub mounted underneath would offer a bit more
protection than if it were side mounted.
The Tempest, as with most sub drivers, is designed to be used
vertically. If you mount it horizontally, it will over time sag on its
suspension, introducing non-linearity. Even with vertical mounting,
it's advisable to rotate the driver by 180 degrees every few years, to
avoid the cone eventually rubbing in the gap.
As it happens, I'm about to build a 'killer' sub using a pair of
Tempests and a 500 watt amp in a 200 litre sealed cabinet. The drivers
will be vertically mounted, for the reason given. It should be X-Max
limited to less than 20Hz, and provide in-room levels of 120dB from
20Hz up with corner mounting, with a low-Q alignment using Linkwitz
Transform equalisation.
Hopefully, this will be 'adequate', for somewhat less than the cost of
a REL Q201. :-)
--
Stewart Pinkerton | Music is Art - Audio is Engineering
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