Quote Originally Posted by ALTEC-REP View Post
For Sale: 1974 Vintage ALTEC 15" Musical Instrument Loudspeakers
NEW AD 2/25/2019 in Minneapolis - Yes, I will ship insured globally.
Two 418B 100dB/W Pro version of 416-8A, Alnico on 15" $600/pair.
Single 421-8H II 150W on 16" White Frame - very nice - $200/one.
Retiring at 70, lightening the load...
418 are good speakers but they aren't pro versions of the 416.

The only thing they have in common is the frame. Maybe the terminal posts and voice coil leads.