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Good foot for a downfiring sub
Good foot for a downfiring sub
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Old 12th November 2008, 07:17 PM   #1
andreaemme is offline andreaemme  Italy
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Default Good foot for a downfiring sub

Hello, I'm going to build a new bass reflex sub using the Peerless XXLS10 830846 and a Hypex DS 4.0. In this project I've decided to use the downward-firing configuration, and so I have the problem of finding good foot. I've found these:
Solen alluminum conic feet
So I ask you: is a 5 centimeters distance from the floor to the baffle enough?
And at least: where can I find alternative strong conic foot for my project?
Thank you very much!
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Old 12th November 2008, 10:41 PM   #2
GM is offline GM  United States
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Location: Chamblee, Ga.
The way I calculate the minimum distance for a 5 cm height requires that for this driver's Sd, Xmax, the perimeter of the cab be at least 104.14 cm, i.e. 26.035 cm on a side if square for a down firing driver. If the vent is down firing, I need to know its diameter to calc the minimum height, but I can tell you it will be considerably higher than what this driver requires unless the cab's perimeter is much > 104.14 cm.

Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
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Old 13th November 2008, 11:51 AM   #3
andreaemme is offline andreaemme  Italy
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Join Date: Nov 2008
The size of the interested face is 57.5 x 38 cm, so perimeter is 191 cm (Vb is rather large, 64 litres, the best for this driver, found through three different experimental solution and confirmed by a simulation of a flat response upon the MEASURED T/S params, a bit different from the nominal).

So can I be sure with a 5 centimeters heigth?

Please tell us, what method have you used to calculate the min perimeter?
Thank you!
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Old 17th November 2008, 01:41 PM   #4
hm is offline hm  Europe
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Location: near Hamburg Germany
normally a 10" has a SD of ~350 qcm,
so you need min. ~2 cm, so 5 cm are enough,
but more important,
underlay your box with a flagstone,
in germany 50 x 50 x 5 cm, Beton, ~30 kg,
underlayed with 0,5 cm felt.
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