The right crossover

[audiophile.1963]

Hi,
I have this set of loudspeakers: woofer 2231h, mid bass 2118h, mid high 2105h and 2403h tweeter. A 3143 or 3144 crossover should be ok with this set? Or there is someone who can help me in this "enterprise"?
Thanks
Giuseppe

[Robh3606]

That's a custom driver load. The only way to do it is in box measurements tranfered into LEAP or another suitable program. None of the generic crossovers will work right out of the box. The closest would be the crossover used in the 4315.


http://www.lansingheritage.org/html/jbl/specs/pro-speakers/1977-4315.htm

Rob:)

[audiophile.1963]

Hi,
I have this set of loudspeakers: woofer 2231h, mid bass 2118h, mid high 2105h and 2403h tweeter. A 3143 or 3144 crossover should be ok with this set? Or there is someone who can help me in this "enterprise"?
Thanks
Giuseppe


Now I have the plan of the crossover inside my JBL L250 DIY: what do uou think about? Can I improve? Let me know
Giuseppe

[hjames]

Now I have the plan of the crossover inside my JBL L250 DIY: what do you think about? Can I improve? Let me know
Giuseppe

Actually, its there in your home and you can listen to it with your favorite sources and music.

The bottom line is - what do YOU think??
How does it sound TO YOU?

Do YOU like it?

[audiophile.1963]

Actually, its there in your home and you can listen to it with your favorite sources and music.

The bottom line is - what do YOU think??
How does it sound TO YOU?

Do YOU like it?

The boxes are removed and I am doing a redesign. Crossovers are built with components evil and bad and with slightly different values. The scheme reflects a compromise between these values. In my opinion, the parts should sound better, so I opened a tread, for your advice. I know it's difficult but if you can help me ...
Thanks
Giuseppe

[pos]

Given the heterogeneous and unique set of drivers you have, I guess your best bet would be to go 4way digital active (and be prepared for a lot of measurements an tweaking...).
This system sure has a potential: a 250Ti with 3dB more efficiency and a cool looking tweeter :coolness:

maybe you could also try adding lens over the 2105 to broaden its horizontal directivity in its upper range, as is done in the L220:
http://www.lansingheritage.org/html/jbl/specs/home-speakers/1979-l220.htm
(see curves page 3)

[audiophile.1963]

Given the heterogeneous and unique set of drivers you have, I guess your best bet would be to go 4way digital active (and be prepared for a lot of measurements an tweaking...).
This system sure has a potential: a 250Ti with 3dB more efficiency and a cool looking tweeter :coolness:

maybe you could also try adding lens over the 2105 to broaden its horizontal directivity in its upper range, as is done in the L220:
http://www.lansingheritage.org/html/jbl/specs/home-speakers/1979-l220.htm
(see curves page 3)

A 4way digital active is too much expensive, I have thought this solution!

[pos]

Then you can go 3way digital active (DCX2496), and use a passive crossover between the 2105H and the 2403H (replicate the one from the L220)

[audiophile.1963]

Then you can go 3way digital active (DCX2496), and use a passive crossover between the 2105H and the 2403H (replicate the one from the L220)

I'd prefer to to built new pair of improvered crossover. You are better than me in this stuff, tell me where I need to take action, which components to use and what should I do to improve my crossover. Every time I see fantastic crossover improvered in Lansing Heritage, for example of JBL 4343.
Thanks, good Sunday
Giuseppe

[audiophile.1963]

Then you can go 3way digital active (DCX2496), and use a passive crossover between the 2105H and the 2403H (replicate the one from the L220)

I have seen the plan of the L220 crossover: to replicate It should be a good idea but my JBL 2403 is a 8 ohm version, in the L220 the 076 is a 16 ohm version. I forgot to say the cuts frequency of my crossovers: 400Hz. 1200Hz and 5Kz. The L220 crossover should be modify for the ohm of tweeter and for the cut between mid bass, JBL 2118h, and mid high JBL 2105/LE14h. At the end It remains to solve if the low cuts are OK.
Let me know
Ciao
Giuseppe

[pos]

There is no such thing as 16ohms or 8ohms 2402/2403/2404/2405: they do all have similar impedance curves regardless of the values showed on their label.
So you can replicate the 2105H/076 LP/HP part of the L220 without problem.

Rebuilding a 4343 crossover with better or charge coupled component, or adapt a given network to another driver is one thing, designing a new crossover from scratch is something else altogether! And the drivers are not everything: drivers and baffle layout also plays a big part.
You will need to measure all the drivers you have and use something like spekerworkshop to design your passive crossover. And be prepared for a lot of trial and errors, and difficult choices on how to "voice" the system... (time and $$ consuming)
Maybe you should hire a specialist to do it.
There is one in Belgium: Willy Peters. You would need to send him one of your speakers though. And it is not sure he would accept either: he is a very busy man.
http://www.axiomaudio.net/nos-realisations.php
http://www.axiomaudio.net/realisations3.php

That is probably the best solution for you, and you would be sure to get the best possible result.

[audiophile.1963]

There is no such thing as 16ohms or 8ohms 2402/2403/2404/2405: they do all have similar impedance curves regardless of the values showed on their label.
So you can replicate the 2105H/076 LP/HP part of the L220 without problem.

Rebuilding a 4343 crossover with better or charge coupled component, or adapt a given network to another driver is one thing, designing a new crossover from scratch is something else altogether! And the drivers are not everything: drivers and baffle layout also plays a big part.
You will need to measure all the drivers you have and use something like spekerworkshop to design your passive crossover. And be prepared for a lot of trial and errors, and difficult choices on how to "voice" the system... (time and $$ consuming)
Maybe you should hire a specialist to do it.
There is one in Belgium: Willy Peters. You would need to send him one of your speakers though. And it is not sure he would accept either: he is a very busy man.
http://www.axiomaudio.net/nos-realisations.php
http://www.axiomaudio.net/realisations3.php

That is probably the best solution for you, and you would be sure to get the best possible result.

Thanks for your reply,
I have seen that the better solution should be to replicate the L250 crossover: the cuts frequency are the same but the woofer and the tweeter are different. Can I replace the part of crossover of L250 tweeter with the part of L220 tweeter? ... but I don't know what I can do for the bass: in the L250 there is a LE14H in mine 2231h...
Let me know
Giuseppe

[pos]

No you cant. A passive crossover has to deal with driver impedance curves as well as sensitivity. It is a long long road, and a 4 way is *very* difficult to do right (even active).
Contact Willy Peters, I am sure he will do wonders with your speakers.