Shopping ; by the numbers
Quote:
Originally Posted by pos
the pdf is not online but the HTML conversion of it is still in google's cache:
Okay , good, thanks !
- A couple of notes on woofer design that matter a lot to me.
- I'm in the SR business ( Sound Reinforcement ) so some of my priorities may be different than others that post here.
(1) I look for a Bl figure from an 8 ohm 15", that is over 20 T*m
(2) I would never break the above rule when a woofers "mms" figure is over 100 grams
(3) I prefer a QTS figure that is below .3 ( there's a bit more leyway here depending on application / it could go to .35 )
(4) When a woofer is being used primarily for LF extension ( air pump ), I want it to have a power handling of at least 200 watts rms .
(5) When wanting LF extension, I want the Fs figure to be no higher than 30 hz
(6) When looking for a 15" woofer that can "punch" out a lot of air on a full time basis / I'm looking for a mms figure that is above 125 grams. ( NOTE: The heavier the cone becomes, the stronger the woofers' motor needs to be, essentially reinforcing rules 1 to 4 )
(7) When all of the above 6 points are met / then I want the Xmax to be at least 7mm .
- If you don't have any computer software for SIMMing woofer/box alignments / now is the time to get some before you discover you have bought the wrong woofer for your application .
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