Unfortunately, I can't get the FR I need in a 1x10 straight horn that shallow. The LF Xover target is 150Hz. I'd either have to go 4-way (no-way), or vent the rear chamber. I've been wondering lately if the Delta 10A has a high enough Qts & low enough Fs to get away with venting? I currently own 6 Delta 10As, gotta do something with 'em! Over-excursion would be the main concern....