My B-15 is coming out of storage and and on the way back from the East Coast. When I first acquired it in the late 60's the speaker was blown, and I replaced it with a Cerwin-Vega 15. If I find it needs replacing, I can either get it re-coned or change the driver. What is recommended for a replacement driver that will provide the original sound? I have another cabinet that I can steal the Eminence Kappa Pro LF from, if that is a good idea. Thanks in advance for your help.