Thanks to both of you. Jimmy; I was heading toward ordering a Delta 15A as you suggested. Then, I thought I'd check the Ampeg site to see if I could tell what they used. Of course, they don't give that level of detail, but I did notice the "LF" in the description of the 15". I don't have to duplicate the PF-115HE drivers, but I figure Ampeg did a lot of homework on the design, so I'd like utilize their knowledge.
Now, my old B-15T cabinet is ported, and I understand the HE is sealed (or is it now also ported?), so the same 15" that is in the HE might be the wrong direction for me.
My goal is to upgrade my cabinet up to its max potential since it's in such good condition. As it is today, it's limited in volume and clarity, so I don't use it much.
I use all types, counts, and materials for; strings, amps, basses, & speakers. Non club member #??