Re: Power rating on LF/HF units. Rv!

GregS <szekeres@xxxxxxxx> wrote:
>
>I never made sense out of the term compression driver.
>
>All drivers do create compression.
>and that other way.

Right. But most other drivers move air at atmospheric pressure, in large
volumes.

Compression drivers move air at high pressure in small volumes. Thus, they
need a horn in order to couple the high pressure/low volume throat to the
outside air. You can think of the horn in this case as being an acoustic
impedance matching device.

So a typical compression driver is a high acoustical impedance source,
whereas a typical cone is a low acoustical impedance source.

Now, there ARE some cone drivers with higher acoustical impedance, which
are designed for horn-loading. The Altec 515 is a typical example. Look
at the T-S parameters and see what it would do in a sealed box... it would
not be so efficient.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
.