Hello; this is my post here so forgive me if I've posted in the wrong area or otherwise messed up. As the thread title says I'm looking for any info on a pair of 150-4B 15'' drivers that I've recenty acquired. I've not been able to find any info at all about the B model. Plenty of info about the C but nothing on the B. Does anyone know about these drivers? Such as mfg date and rarity? Should I use them in my daily set up. Thanks for any help and I'm going to try to add some pics but I'm not optmistic about being able to.