"Don Pearce" wrote in message
news:49f9d301.183695000@localhost...
On Wed, 8 Apr 2009 17:34:47 +0100, "Keith G"
wrote:


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.


Well then, buggrit - is the guy in the HFW article right or wrong then with
the phrase 'in a cabinet...' which is vague, if nothing else. When I asked
about the Fostex drivers and was told categorically the cabinet could and
did not influence the sensitivity of the drive unit, the cabinet was
specifically the type called 'back loaded horns' which you prefer to call
TLs (Buschhorn Mk2).

Actually 'categorically' is a bit strong - IIRC, it was more a case of 'I
don't see how it [the cabinet] could alter the sensitivity' or somesuch!

(I'll have to have a shufti at the other stuff later, my day's suddenly
caught up with me!!)