First time poster, long time JBL fan.

I'm planning to build a pair of DIY 4430's. They won't be clones, but they will be similar enough for me. I found plans for the cabinets on this forum from back in 2004, so building a version of the cabinets won't be a problem. I have all the components. Unfortunately my LF drivers are not 2235's. I have a pair old Alnico 2205A's that I'll be using.

My question is about proper tuning of the cabinet with the 2205's. Do I need to change the port diameter and length to keep the frequency response the same, or at least similar? I've done a bit of research into how this is done, but it's a bit beyond me, I'm not confident I would come up with the correct measurements. If they need to change would any of you with the necessary knowledge consider crunching the numbers for me? With any luck I'll blow the dusty old 2205's up and get them reconed to 2235's... or something similar!!

So, Alnico 2205A's, 5 cubic feet, 2 ports... need any more info?

Thanks for any help.

Gary