On Wed, 8 Apr 2009 17:34:47 +0100, "Keith G"
wrote:

OK Don, many thanks for taking the trouble with that very comprehensive
reply.

I was starting to respond when I saw summat from Jimbo come in, just now -
I'll scrute that before I say more but what I had started to type was:

Just to be crystal clear: The phrase "They are very efficient - in a
cabinet, the PM7 hits over 103dB/watt." as per the article is *blx* then, if
the driver itself is only quoted at 96 dB??

Does that bit hold up OK? - Because what I have is a clear and direct
contradiction between the implication of the phrase in the article I
referenced above and what I was told by the *better half* of WA a little
while back and what you seem to be saying - that the cabinet doesn't come
into it..??!!



If "in a cabinet" means a conventional box, then yes it is probably
blx. The cabinet is only really "doing stuff" at the speaker's
resonance. Above that, where measurements are made, it is simply
stopping the stuff round the back getting to the front.

See my reply to Jim, where I concede that if the thing is attached to
a horn (front loading, not the type you made) things are different.

d