Greetings from Ottawa, Canada, Almando. Thanks for the video. It makes me appreciate even more the Gershman Avant Gardes I own. They are truly spectacular speakers. The bass trap at the base of those speakers, which Gershman Acoustics developed, is the reason why their bass response is so amazing. I was fortunate to purchase them from Gershman Acoustics at the end of the Montreal Audio Show a few years ago at an unrefusable price. If you want to hear what these speakers can really do, got to the Tidal streaming service and select Aaron Copland's Fanfare for the Common Man on Reference Recordings. Have a great audiophile journey.
The Gershmans are incredible speakers and so are the Sabrinas. Speaking of vintage speakers, if you ever come across Celestion Ditton 66 take a listen.