Altec A7 Woofer Suggestions Please

Hmm, mine would be 'fatter'/flatter from ~500 - 4 kHz in an 816 [actually, my memory of some 3rd octave RTA measurements recalls a bit of a hump centered around 2 kHz], but otherwise the extension is near enough except mine may roll off a bit slower on the top end, but overall it appears to be what I feared. This is making me wish I'd of hoarded pre '60s 515Bs back when they could be had dirt cheap and usually only needed cleaning, draining/re-zapping the magnets @ $15/ea. [locally].

Oh well, makes new 416s a better deal!

GM