High Efficiency Speaker Asylum Need speakers that can rock with just one watt? You found da place.

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Cone amplitude

Posted by RCA-fan (M) on April 2, 2007 at 12:42:55

In Reply to: Re: AJ can't note these problem = 88 sqcm-? posted by freddyi on April 2, 2007 at 12:02:01:

You need roughly four 6" woofers to equal one 12" woofer. The throat size is set by the B/L and mass, and Fs of any particular woofer.
X-max and piston area determine the maximum acoustic output.

So you can put about 50 watts into one 6" woofer (BC) Vs 800 watts or so into a lab 12. ( much mor x-maX too)

Note however that you can get 104 dB/ 60Hz out of one 6" woofer in about 8 cft. If you use two, it jumps to 106dB ( in corner) with 100 watts power handling. This is 127 dB at 128 watts.

The 12 will give you ( 104 db@60Hz 12cft) 131db @ 512 watts.
The 80 to 500Hz range will be much clearer than the higher mass 12"

Expressed another way, if the horn were straight, and you played a cello- the 6" will sound better. Nice to add one of TD's 15Hz tapped monsters with it

My own take is that I want to get to 50Hz with good efficiency, and want the lighter cone for the mids.
Just my taste after all these years with the high power PA stuff.
Also my ears need a break.

Best Bill

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