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Bozaks require (a) a sealed, not ported, box, (b) a cabinet lined with Tufflex or cotton batting, (c) and a hanging curtain made of Tufflex or cotton batting.
Without those the backpressure strangles the woofer. Infinite baffle is not acoustic suspension, and it requires the backwave be entirely lost. The Barzilays under discussion do not have the lining or curtain, and this requires retrofit. The port appears to be closed off. But the midrange is at the bottom of the cabinet, which makes for poor listening.
Better to, as @nolasally above wrote, and as I and others have elsewhere written, sell off the Bozak drivers and end up with free cabinets for a bass-reflex system.
I myself passed on a pair of beautiful Barzilays with Bozak drivers because of the work involved in properly retrofitting the cabinets. I don't have the space for a bass-reflex system or I would have put in some of the 1950s or 1960s JBL or Jensen drivers.