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You have in your possession a defining piece of audio history. If the remaining issues prove difficult to resolve, who knows, maybe JBL themselves might be interested in offering some support with...

Room resonances exist in two domains, frequency and time. Accoustic treatment will reduce the room resonances in both domains. Depending on the severity of the problem, sometimes simple things like...

How well does your setup work for home use? It looks like something that would be equally at home in a small auditorium. What are the drivers and crossover?

Resonant circuitry calculations show crossover frequencies of around 1.3khz and 2.4khz for the LE85. This would imply a slope of 12db/octave, subject to any other crossover components other than the...

I have used Crown DC300's and found them a very clean sounding power amplifier. They have driven many different types of speaker loads successfully, from JBL4430's to Quad Electrostatics and Apogee...

[QUOTE=Chris_K.;437490]Hello from Germany

Would be great to Share some experience…
What Settings are you using?

I am running mine on Crown xti Amps, using the internal dsp.
one Amp per...

[QUOTE=Chris_K.;437490]Hello from Germany

Would be great to Share some experienceÂ…
What Settings are you using?

I am running mine on Crown xti Amps, using the internal dsp.
one Amp per...

Thanks for all contributors thoughts and expertise so far, along with any in the future. All gratefully received.

I believe JBL speced. the 2421A as usable down to 500hz at reduced power. Although...

Has anyone had experience of using the 2421A compression driver at its lower recommended crossover frequency of 800hz? The driver in question is part of a 4430 active restoration.

Very interesting. There's a huge amount of work going into audio perception, but as far as reproducing
sound goes, there's still more than a country mile to cover before loudspeakers become as...

I personally favour active crossovers, which I intend to implement in my 4430's restoration. As you state the refinement of adjustments far exceeds anything possible in a passive crossover. Plus you...

At the risk of sticking my head above the parapet again!

You are correct it is immeasurable, as there is nothing to measure. In simple terms depth and side to side are an illusion produced by the...

Firstly can I thank all those who’ve brought some calm and reason to this post. I never thought any replies would become what I can only describe as a ‘rant'. Which somehow managed to include a...

I'm surprised that any attempt to measure this phenomena has caused such anguish. " You want to argue with somebody about go look up Greg". I believe that measuring outcomes in any sphere is a solid...

Re: Here we go again, maybe it should be hear we go again?

The addition of IM (intermodulation) distortion is mentioned in a post on charge coupled crossovers, but no figures are quoted. If...

Having seen that many contributors to the forum value the use of a charged couple crossover network. I wondered if there are any measurements to back up these assertions? Maybe I haven't searched...

Widget is right. Don't be fooled by pervayers of snake oil.

Lf cones are still made from paper and aluminium is still widely used ( and sometimes preferred) in compression drivers.Through research, materials used in transducers have now given engineers a...

How far has reproduced sound quality really advanced in the last 40 yrs? Any thoughts on a fully active 4430/35 with DSP vs M2?

These are not ribbon transducers in the true sense of the word. They are planar transducers with a flat voice coil fixed to a substrate. A ribbon tranducer comprises a thin, usually pleated length of...

Any frequency at which a transducer radiates in an omnidirectional pattern will be reinforced or reduced depending on the wavelength, the size or the enclosure and distance from the ground plane. Up...

I would certainly endorse all those who have recommended Crown power amps. In my experience they put sound quality, power output and reliability all at the top of their design list. I have used 4 DC...

Both the JBL 4435 & 4430 have a slightly upward tilted axis and in studio installations they're sometimes soffit mounted and inverted or stand mounted and tilted forward to bring the speaker axis to...

An impressive array. Are you a fan of organ music? Seriously with the 4435's mounted on top of your sub woofers the 4435's axis will be at tilted up above head height. Great if your dancing to the...

The diameter of a transducer will determine the frequency at which it becomes more and more directional. Depending on the design of the transducer it also might be suffering from breakup before or...