I've got a 3X15 cabinet in cascade I picked up and it has no tags or writing on the speaker jack plate. It has 11 pleats across the top and 27 down the side. I've got the 3X15 (2X15 with siren horn) PA cabinets and this is just a tad narrower cause the K200B heads hang over the sides on this thing. Is this indeed for a frank setup. It is not ported and no metal Kustom tag on front. The speaker grill is above the speaker baffle board the whole length and width of the cabinet. Is there anywhere else hidden in these things to find what model this belong to? Thanks Steve C