DIY JBL 4344 project

[JBLP]

Yep, that one!
Your mum is right; you will wake and shake the neighborhood when you drive it with your amplifier ...........

[martin2395]

It's not that bad, it's only does 2,5kW @ 4 Ohm bridge

I saw that you cut off the surrounds, when you replace them use the with original, hard onesand not foam or you risk blowing the drivers in the TCB

[JBLP]

Hi Martin,
Oeps...

Please explain.
Don't know yet if they will go back in the TCB; like to make the B460.

[martin2395]

There is a difference between the depth of the voice coil winding, the 2245H has 24mm and 2240H has 19mm but I don't think it will affect the performance much.
The quasi-2245H will be less powerful because a 2245H will bottom out quicker than 2240 because it has softer suspension.
Though it should still move the walls if needed

[Toro Italo]

Good morning everybody!

First of all, thank you very much for sharing very useful info and advices.

I'm considering bi-amping of my beloved diy JBL4344.

Using an electronic crossover, I could bypass the low-pass passive 2235 and connect directly to the bass section final amplifier.

But how would I modify the passive high-pass, the one dedicated to the 2122? I mean that with inserting an electronic crossover network, the 2122 would be filtered by both the active and passive crossovers. Could this create problems of phase rotation or other kind of problems?

I hope I was clear enough ... sorry for my little English.

Thanks to you all for the wonderful job and for the support.

Best regards from Italy,

Toro

[Odd]

If you have the original 4344 there is a switch at the input terminal.
This switch removes the components in the filter that should not be there when you bi-amp.
4344 and 4345 have the same crossover.

[Chas]

By the way, when you are doing the necessary surgery for bi-amping, you also have an opportunity to bi-wire above 290Hz. A pair for the 2122 with its associated network and then likewise for the HF/UHF combination, if you really want to guild the lily.