Crossover confusion

[iceman]

Greetings all. It has been my honor to browse this site for valuable info numerous times through the years, and now my initial post, question(s). I will be doing a DIY speaker project using components I already have. 2226H-LF( also have a pair of D140Fs), 2445j/2380a-mid/high/, and 2404(2405 diaphragm) on top. 3110a dividing network...and had planned to cascade to a 3105 (which I don't have)but they are very pricey and hard to find so I may build my own, a first for me. Looking at the response curve of the 2445/2380 I would actually prefer to cross to the 2404 around 9khz anyway, I think. In looking at jbl info sheet it has LF and HF for 3105 and 3106 at 16ohms each. The schematics show crossover impedence is 16 ohm for the 31059 which is what the 3110a wants to "see" for HF, and 8ohm for the 3106. I notice two resistors in the 3106 not present in the 3105.

http://www.jblproservice.com/pdf/Network%20Schematics/3106%20Network.pdf
http://www.jblproservice.com/pdf/Network%20Schematics/3105%20Network.pdf

So...What inductor values can I use to get x-over frequency of around 9khz, and should I use the resistors or....?
I did find another thread on here that left the last question unanswered.
I realize the components may be frowned on by some for home use. I hope to fit this in a 4333-like cabinet to be constructed with the help of an Amish neighbor, top and sides from red oak, MDF back and bottom, birch ply baffle.
I got my first A-7 horns/D140Fs in '72 which I still have! A Lansing fan !!!! Any and all insights on any part of this appreciated, thanks to all for the existence of this site.

[ivica]

Greetings all. It has been my honor to browse this site for valuable info numerous times through the years, and now my initial post, question(s). I will be doing a DIY speaker project using components I already have. 2226H-LF( also have a pair of D140Fs), 2445j/2380a-mid/high/, and 2404(2405 diaphragm) on top. 3110a dividing network...and had planned to cascade to a 3105 (which I don't have)but they are very pricey and hard to find so I may build my own, a first for me. Looking at the response curve of the 2445/2380 I would actually prefer to cross to the 2404 around 9khz anyway, I think. In looking at jbl info sheet it has LF and HF for 3105 and 3106 at 16ohms each. The schematics show crossover impedence is 16 ohm for the 31059 which is what the 3110a wants to "see" for HF, and 8ohm for the 3106. I notice two resistors in the 3106 not present in the 3105.

http://www.jblproservice.com/pdf/Network%20Schematics/3106%20Network.pdf
http://www.jblproservice.com/pdf/Network%20Schematics/3105%20Network.pdf

So...What inductor values can I use to get x-over frequency of around 9khz, and should I use the resistors or....?
I did find another thread on here that left the last question unanswered.
I realize the components may be frowned on by some for home use. I hope to fit this in a 4333-like cabinet to be constructed with the help of an Amish neighbor, top and sides from red oak, MDF back and bottom, birch ply baffle.
I got my first A-7 horns/D140Fs in '72 which I still have! A Lansing fan !!!! Any and all insights on any part of this appreciated, thanks to all for the existence of this site.


Hi

May be You can start with 4333 network or Nelson-Pass design.. so round 800Hz and 9kHz....
I have used something like attached figure.

regards
ivica

[iceman]

Thank you for that schematic Ivica. When I get the cabinet going I will post pictures. Probably not a lot of Amish made cabinets on the forum. I may have the opportunity use H93/2308 horn /lens instead of 2380a for better or worse?

[ivica]

Thank you for that schematic Ivica. When I get the cabinet going I will post pictures. Probably not a lot of Amish made cabinets on the forum. I may have the opportunity use H93/2308 horn /lens instead of 2380a for better or worse?

Hi iceman,

I have used 2441 core with Radian1245 Al diaphragm with 2311 horn and 2308 lenses. They reproduce sound in acceptable way, but most of the AH Forum members said that they are "too inquisitive". May be 2380a would be less 'precise', but, what I can suggest is PT-H95HF with 2450-1.5 or 2451 equipped with SL diaphragm. D8R2450SL, BUT with mid-bass used up to about 1.5kHz.
Using mid-bass would be well-come to 2311 too.
Above 10kHz I have 2405.

I wish You a good luck.
regards
ivica