It looks like a 12" woofer, but it's really a dummy.
--- 32 Hz is not so dumb.
What you're looking at is called a vent substitute. It lives and breathes as part of our Interface: A vented, equalized speaker system.
It's a 10" diameter piston with a mass of 400 grams, which is equivalent to the air in a so called "real" vent 20 feet long.
Our vented, equalized design allows the Interface: A to give you that 32-Hz low frequency limit (3 dB down) in a true bookshelf size cabinet. It's 1/3 octave more bass than you'll find in much larger acoustic suspension systems.
And if you think that's ingenious, consider this.
Our vent substitute does most of the work for our woofer.
So total harmonic distortion at the low frequency limit is only about 1% , even at full power.
In terms of what you hear, all this means that the Interface:A delivers more measurably accurate reproduction than acoustic suspension systems twice our size and cost.
Does this make Interface: A the speaker system you should own? You'll have to hear for yourself what makes our dummy such a smart idea.
Interface:A
Electro-Voice, Inc. a Gulton company. 619 Cecil St., Dept. 174 H, Buchanan, Michigan 49107 USA.
-----------(High Fidelity, Jan. 1977)
Also see: