4406 modding

[Jonkan]

Hi! First post here! My name is Jonas, I live in sweden and work as an FOH mixer.
I have a pair of JBL 4406 monitors at home which i use to mix music i record in my home studio.

I recently thought about modding the crossover with better components, but im having problems finding the right values for it.

The original 4406 crossover uses a 3uf mylar film cap, and one 6uf mylar film cap bypassed with what looks to be 0.01uf film caps (polystyrene caps perhaps?)

I was thinking of replacing the 3uf, and 6uf caps with better ones. But problem is that i cant find any of those exact values.

For the 3uf that isnt really a problem, as i can parallel two 1.5uf caps. But for the 6uf cap i cant find two values of caps that i can buy that combined would make for a 6uf in total.

So im wondering, how critical is the exact value of this cap in this application? Can i get away with 6.2uf which is the closest i can get using whats available here to me (4,7uf+1,5uf)? Or do i have to search harder for caps that would fit the bill?

What would you recommend for bypass caps. 10n polystyrene, or 10n polypropylene?

Thanks alot for any insight! I tried searching the forums, but i couldnt find much info about modding the 4406 speakers.

Have a nice day!
/jonas

[rs237]

For the 3uf that isnt really a problem, as i can parallel two 1.5uf caps. But for the 6uf cap i cant find two values of caps that i can buy that combined would make for a 6uf in total.

.............

What would you recommend for bypass caps. 10n polystyrene, or 10n polypropylene?

Have a nice day!
/jonas

Hello jonas,

I understand your question not completely. Why don't you take parallel four 1,5µ Caps for the 6µ Cap? Isn't there sufficient place?
I prefer MKP = polypropylene or siver/mica caps.

regards
juergen

[Zilch]

3.3 + 2.7 = 6.0, no? :dont-know

Solen and Dayton (Bennic?) both have 3.0, also....

[Jonkan]

I guess i could try 4 1.5uf caps. But it would be pretty tight since i have to stuff 2 more of them to get the 3uf value also.

I cant find any 2.7uf, or 3uf quality caps where i live. 3.3uf is no problem though. I have a shop nearby that sells the SCR caps, they should be ok, right?

How about the bypass caps. Polyprop, or Polystyrene? I can easily get both. If nobody has tried it, i guess i have to try both and listen.

Is it worth it to change the caps btw? This is my first attempt at "tinkering" with speakers, so i have no idea how much difference it will make, if any.

/J

[4313B]

4406's with charge coupled networks are pretty impressive little loudspeakers.
I might still have a pair of the cc networks sitting on a shelf somewhere.
I don't think they are "fancy built" like alot of my networks are though.

[Jonkan]

Sorry if this is an ignorant question, but what are charge coupled networks?

Any info on how i could build some? Schematics, pcb:s, etc?

Or are you selling? :)

Is it not worth it to modify the original passive n4406 network?

Sorry, that was alot of questions.

But seriously, if you have a pair of these you can part with im definately interested. How much would you like for them? I guess i can always upgrade some components to make them more "fancy built" as you say later on.


Thanks!
/Jonas

[4313B]

But seriously, if you have a pair of these you can part with im definately interested.Well I found them believe it or not and snapped a photo real quick. Send me a PM with shipping details and I'll send them off to you. You can pay the freight. You'll have to figure out how to get them in your stock 4406's. I rebuilt all my 4406's as mirror imaged pairs back when I was doing this.