sorry erich, that was the close cousin of the 4645c, the s1s-ex used in the synthesis line. more or less the same thing. just a rough idea of how an 18" could look with a triple flared port.
also, email sent.
dimensions of 34" tall x 21" wide (golden ratio proportions, so it will look pretty :-) ) x 28" deep, with 3/4" stock and 1.5 cubic feet for bracing, driver, and ports, nets out to 9 cubic feet on the button.
three 3.5" flared ports x 24" long would tune that cabinet to 18hz, which would be just about perfect. the trick we used here was to make the cab just a little bigger, so the ports could be a little shorter, so no bends would be required, and we still get a good medium-low tuning. might even be a hair lower with the straight ports firing directly into the rear wall and/or with a little stuffing in the sub, but i'd target 17-18hz with the SI/Dayton dynamic driver duo.
btw, three 4" ports x 24" long would tune the cab to 20.4hz or so, which is a little high, but maybe with rear wall interaction and stuffing it can be brought down into the 17/18hz ballpark.
marketing guy comedy...this one has a bigger dustcap than the 2242..."cover up those voice coil leads! yes sir!"Edited by LTD02 - 10/10/13 at 12:07am