Passive X over project

Hi All i am considering building a passive 3 way X over following a JBL model.

There are lots of components - especially coils which i anticipate will be tough to source locally, so will probably need to get from abroad.

Any body with any experience in this area?

Its a 3313 model X over that i intend to build.

Hi Highcut,

I think most of the passive parts (caps, resistors) can be sourced locally - Octave Electronics have a good stock of values and brands. They are good people to deal with.

Inductors may be sourced from the net or custom locally. Partsconnexion.com, erse.com, parts express, farnell, rs, e-bay, etc. depending on your choice & budget.

My experience in building passive crossovers has been a mix-bag. After spending a fair sum on rebuilding a passive for my DIY Altec VOT speakers (different brands of caps - film, paper-in-oil, teflon; different resistors brands - dale, mundorf, mills; different coils - custom, erse), I finally settled on a DIY 2-way active crossover.

Of course, having a tri-amp would be an expensive alternative (additional amps, active crossover, cables, etc.), but I personally can't imagine myself going back to a passive crossover in my current set-up.

Maybe getting Wikin's help and/or advice? He is currently doing good work on a tri-amp active crossover.

I'd second Mthoi's suggestion. Most of my DIY, i source components from Yap or Helen at Octave. They are very nice people to deal with. Also, if they don't have what you want, they usually are very helpful to me to suggest other sources or order from the net for me if i am too lazy to order myself.

Any idea what specification caps or inductors you need?

Bal.

Thanks Bal and mthoi for yr thoughts, i am much obliged
Perhaps i can get parts locally after all:)
Ideas still fluid at the moment - it will either be the 3133 (L300) or the LX6A plus the N8000 (converts to 3 way) but whatever i settle with it'll be a passive over .

I will talk to them at Octave

https://plus.google.com/photos/101575652324134556914/albums/5757369404287687521#photos/101575652324134556914/albums/5757369404287687521

Thanks guys
I got a bunch of caps and inductors from Octave
They were v helpful
Expnsf parts from Mundorf mainly
Hope its all worth it.
Cabs being modded now....

highcut28 wrote:https://plus.google.com/photos/101575652324134556914/albums/5757369404287687521#photos/101575652324134556914/albums/5757369404287687521

Thanks guys
I got a bunch of caps and inductors from Octave
They were v helpful
Expnsf parts from Mundorf mainly
Hope its all worth it.
Cabs being modded now....

i got a forbidden error for the link. maybe you should upload them to an image hosting service like imgserv.

Hi

For xover mod, do observe the capacitor polarity, it does influence the sound.

Refer to the link,

http://jimmyauw.com/2010/04/24/observing-inner-and-outer-foil-of-some-popular-capacitors/

Cheers

boonchang wrote:Hi

For xover mod, do observe the capacitor polarity, it does influence the sound.

Refer to the link,

http://jimmyauw.com/2010/04/24/observing-inner-and-outer-foil-of-some-popular-capacitors/

Cheers

Oh thanks for that
The guys in Octave marked the directionality for me.

If u are interested in xover design, then u should get an analogue active xover first. The reason is that with the mention device, u can change the xover cut off frequency easily and find the optimum setting for your JBL. After that u can design your own passive xover. U can google a lot of stuff especially in DIY website, they have all the tools in designing xover. From xover orders, type and even components to use.

For capasitors and inductors u can buy them from USA either from Madisound or part express.

Thanks Adcomer
I got all the stuff from Octave and made up the X overs. Works nicely

Just need someone to make me cabs now.
Does anyone know someone that can make me cabinets based on the JBL 4333 ?

Hi
Me changing the Title cause i made my X overs but now need cabs.
Can anyone out there help me or put me in touch with someone who can build me cabs based on the JBL 4333?
I have some plans.
Getting pretty frustrated !

highcut28 wrote:Hi
Me changing the Title cause i made my X overs but now need cabs.
Can anyone out there help me or put me in touch with someone who can build me cabs based on the JBL 4333?
I have some plans.
Getting pretty frustrated !

Write to this gentlemen - vmps_voon@yahoo.com. He might be able to help you.