VRX932LA

[Jan Daugaard]

Hi Johnaec,

in http://www.jblpro.com/pub/cspels/CBT4%205-5-03.pdf we are informed that the 2407H has a 'center-clamped' titanium diaphragm. What does 'center-clamped' mean?

Regards
Jan D.

[johnaec]

What does 'center-clamped' mean?

Look at post #5 in this thread: http://www.audioheritage.org/vbullet...ead.php?t=4161 There you will see an opened up cener-clamped 077 ring-radiator. The 2402/075, 2403/076, and 2404 use the same method, but with different "center-clamps, also known as "phase plugs":

In the 077 picture shown, the clear part sits on top of and "clamps" down the center of the diaphragm - the radiating part of the diaphragm is the silver "ring" portion around the center "clamp" - this is why they're referred to as "ring-radiators". The blue portion is simply the outer mounting flange, ehich doesn't move. The silver inner ring portion is the only part that moves - it's "clamped" down in the center and the outside.

This thread shows what the phase plug looks like for the 2403/076 and 2404H: http://www.audioheritage.org/vbullet...&highlight=076 This style is conical because of the horn design, but it functions exactly the same, to hold the center of the diaphragm down and also assure correct phasing/dispersion of the sound waves through the horns mounted to the front.

John