I am rather new at this horn thing. Today the compression driver I bought - a JBL 2445J - arrived. I have never seen one of these before. It's supposed to weigh 32lbs. but, my God, if feels as if it weighs 100! Why does it need to be heavier than a typical 18" woofer? There are lots of tweeters that can do the job that weigh so much less; why does a compresssion driver need to be so heavy? In other words, why does it need such a massive magnet? And how should this be supported? I certainly am not going to let it just hang there supported only by the bolts holding the horn.
Finally, how do you test a compression driver? Just attach an amplifier and let 'er rip? I asked in another post how hard was it to recone a woofer; how hard is it to replace a diaphram? It looks ok but there seems to be a few things around it that probably ought not to be there.