Beryllium Diaphragm in JBL 4355 speakers ?

[Ian Mackenzie]

This is an interesting thread on Charge Coupling.

I cant believe how passionate l was about all this stuff back then.

At the moment l have my hands full (literally) so posting is only here and there.

http://www.audioheritage.org/vbullet...g-on-the-Cheap

[Ian Mackenzie]

I dont like series inductors in the signal path .

I physical inductor is never an ideal passive component, they have insertion losses, other properties that can impart impurities in the signal and their intended effect is never optimal as the loudspeaker is an electro mechanical device that reacts with the inductor.

When an inductor sees a driver and its motional impediance the perfect world of your crossover schematic turns to hell.

The crossover is usually design around small signal performance of the driver. Ramp up the power and everything shifts and is sometimes modulated with thermal distortion.

Simple aspects like dynamic damping also go to hell.

Bi amping bypasses all of this and yhe crossover function is independent of the driver influence and is under the driect control of the amplifier. Stuff like Thd of the driver will still rise with increased power but all the driver parameters the passive crossovers rely on are effectively de coupled from the crossover with full bi amping.


At realistic volume levels the mid bass driver actually moves and we want it to work almost ideally to create the the reverberant ambiance of the original musical event. Most commercial loudspeakers compromise this and no one cares because the loudspeaker can cant go loud enough anyway. But in the case of ghe 4355 the diyer has the opportunity to push the envelope.

[Dr.db]

But if I didn`t get you wrong, the mid and high horndrivers still remain with their inductors, right ?
So the mentioned problems would be still an issue in that range...