Need help with x-over for 2123 & 2425

[HipoFutura]

I've decided to build the 4344 recently detailed in the DIY forum. I will use these in a tri-amped system. For this reason the only passive x-over I'll need in the speakers will be for the 2123 and the 2425. I have the 2123Hs and am looking to acquire the 2425Js. Can someone help me with a suitable x-over design for these two drivers. Using my Ashly x-over I can set the low freq x-over at 200hz and the hi-freq x-over at 8K hz. Don

[hjames]

I've decided to build the 4344 recently detailed in the DIY forum. I will use these in a tri-amped system. For this reason the only passive x-over I'll need in the speakers will be for the 2123 and the 2425. I have the 2123Hs and am looking to acquire the 2425Js. Can someone help me with a suitable x-over design for these two drivers. Using my Ashly x-over I can set the low freq x-over at 200hz and the hi-freq x-over at 8K hz. Don

So - you'll feed the combined MF & HF out of the ashley to an amp, then use a passive to split that to the 2123 Midbass (MF) and the 2425J (HF).

Wouldn't you just build the middle 2 legs of the Giskard 3145 equivalent circuit from the same thread? http://audioheritage.org/vbulletin/showpost.php?p=136883&postcount=22

[Robh3606]

Your best bet would be to use the 4344Mk 2 crossover. Not sure 200hz is going to work with a 2123. They rool off fast in a closed box. They just don't have the same lowend as a 2122. You can build it charge coupled of convert it to single caps to save on the cost. If you go this route you want 2425H's as the 275 are 8 ohms. You can use 8 ohm drivers in the 4344 as well you just leave out the 20 ohm resistor across the driver. Or you could get a spair set of 8 ohm diaphrams.

http://manuals.harman.com/JBL/HOM/Technical%20Sheet/4344MkII%20ts.pdf

Rob:)

[HipoFutura]

Thank you Heater and Rob for the info. Chopping the middle out of Giskard's x-over looks like a good place to start. This project will take a few months to complete as I have limited time to spend with it. However, it looks to be a fun and rewarding project. Don