I heard about a Standel speaker cabinet for sale a few towns over (haven't laid eyes on it yet). From the description it is likely an Imperial IV. I am assuming it doesn't have rear access (???). How is the grille fastened to the cabinet and is there a way to positively confirm that the speaker is a JBL D130 without unfastening the speaker and examining it's back side? Any additional information including a reasonable price for it would be helpful, too. Thanks.