4343 References Thread

[4313B]

JBL used "12 ohms" for the compression drivers and "10 ohms" for the ring radiators.

Since JBL did pretty much everything empirically their networks might not make alot of sense if you try and plug them into standard formulas.

The key to the intended nominal impedance value for the given network load is to measure the impedance of the driver and L-Pad (along with a shunt resistor or conjugate across the driver if there is one) with the L-Pad set to the 0 dB reference. I specifically asked Mark Gander back in '79 why the 16-ohm L-Pad on the 8-ohm driver and he said "we used it to increase power handling", so there you have it.

[DogBox]

.... so there you have it.

Hi 4313B,

Thankyou for clearing away the migrane I got trying to figure out the "why-for's"! I'm just going to replicate the circuit and put 0.01uf film & foil
bypass caps accross each capacitor and start from there.

Still weird to have only 'one' 16 ohm driver [HF] and the rest 8, but, i'll get the hang of it if I stop trying to figure it all out and just listen to the results... Thanks again 4313B!

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DogBox