Vintage Celestion Greenbacks (1973 and earlier, with Pulsonic Cones) are the holy grail of vintage hard rock tone but the prices have sky rocketed. In this video I compare a vintage Greenback to 2 comparatively affordable speakers:
Gear:
1970 Celestion G12M25 55Hz Greenback
1983 Celestion G12-65
1987 Celestion Marshall Vintage V30
202X Marshall DSL20HR Amp
202X Nordin Comet Krystin Guitar