On Tue, 14 Dec 2004 14:28:52 -0600, Harvey Gerst
wrote:

The JBL 075 (don't know what it's called these days) went out to 40 KHz with
very high efficiency. snip

Not true. 075 = consumer version, 8 ohms 2403 = pro version 16 ohms
-3 dB down at 15 KHz on axis.

The "slot" was 077 = consumer version, 8 ohms 2405 = pro version 16
ohms -3 dB down at 25 KHz on axis.

40 KHz? It might be there, but way, WAY down in the mud. However, a
cheapo Motorola piezotweeter will do 40 KHz almost flat...although, as
was found out after the fuggin' things were introduced, you wouldn't
want to use them for sound.

dB