4430-4435 Revisited- A short story

[Ian Mackenzie]

This thread is not a hack work or a diy attempt at re-engineering an already splendid design but a look at what may provide more listening pleasure.

In a sense the 4430-4435 appears a more simple concept, but beneath that simplicity lies a very sophisticated and elaborate design.

Go here for details:

http://www.audioheritage.org/html/pr...bl/4430-35.htm

So we are not going to mess around with the design but look at the more subtle and perhaps the not so obvious. As the saying goes, if it it ain't broke don't fix it.

Reading over a few posts by members who have bi amped the 4430-4435 it would seem that while they felt there were some gains they also felt that something was lost.

As discussed here:

http://www.audioheritage.org/vbullet...4430+crossover


I also found this when biamping the 4344-4345 and the findings can be read elsewhere in the 4343-4344 upgrade thread.

Its a case of not what you are doing but how you do it. The 4430-35 has stood the test of time but with the associated equipment things have moved on a bit.

The intention is to build a purpose built active crossover and amplifier and arrange for a member to trial it for a time and post their observations.

If you are interested post or send me a pm.

Ian

[yggdrasil]

You are so full of energy.

[frank23]

such a good idea!

but I don't even have the time / energy to build cabinets for the 2235's I have had lying around [freshly reconed] for the past 3 years so I would not be worthy of such an effort to be made

it would be very nice to have a good active compensation setup for the 2344 as the active compensation in the M552 crossover is not good at all, not even for the 238x series for which it was meant

frank

[Ian Mackenzie]

Frank,

The 4430-35 has the compensation built into the passive crossover.

The compensation remains in the circuit when bi amping.

You are correct that other compensations may not be correct.

If you search the forums there are several threads that discuss the 4430-35 crossover in detail..incl voltage drives.

Actually....I have an idea.

My brother has a spare pair of 2235H's and I know where I might find the 2344 horns. I might build an exact 44430 clone over the holidays however i do not propose that this will become a diy 4430-35 thread.

Prior to my current system I spent 18 months testing & using the 2344 horn and it's passive crossover, so I have some idea of it characteristics. The important thing is not to mess with the JBL design.

Ian

[Zilch]

If we had the M552 crossover schematic, a simple mod to the "CD pre-emphasis" might make it play 2344 nicely.

[Think NL200t3....]

All I have is the block diagram in the manual....

[Ian Mackenzie]

Perhaps but that is not the intent here.

If one takes the time to read the profile and the White Paper it becomes obvious why they did what they did. No doubt there were other options but the one taken did everything they wanted to do at the time.

I will look at flattening the ripple (as discussed by David Smith) where possible at the lower end on the horns response.

I suspect you might have missed that with your rta .