In this video I compare an early 1970s Fane Crescendo speaker to a 1960s Fane Crescendo Purple back speaker.
Gear:
1970s Fane Crescendo 12A Model 122346 (4Ohm)
1960s Fane Purple back Model 122/17A (16Ohm)
1976 Hiwatt DR103
2021 Fender Telecaster CS 1960 relic.
Close mics: 548 dead center and Re10 45 degrees
Room mic AKG C414
Hallway mic: Shure Beta 57A
Using an Iron man II to attenuate and match impedance
Speakers housed in a 1970 Marshall 4x12 played one at a time