I am planning a project and the JBL design (#6 in the pro enclosure guide) calls for two 4" ID x 6.5" lg port tubes. If I use outside flared ports would I measure the 6.5" from where the curve of the flare meets the straight tube or consider the flare to be part of the length? Or include half the depth??? Or is it just better to square butt the tube to the cabinet?
Thanks!
Bernard