for driving a set of Dayton Audio RSS460HO-4 18" Reference HO Subwoofer 4 ohm in a ported cabinets which do you think would be best suited for powering them either a Crown XLi 2500 750W 2-channel Power Amplifier or the Crown XLS 2502 775W 2-channel Power Amplifier in a layered ported cabs tuned to 21hz with either 750watts at 4ohm (xli) or 775watt @4ohms (xls) an a 4th order high pass at 16hz from my outlaw audio 976 receiver with a 44in long 12in wide 2.5in high flair port the walls of the cab will be 1.5in inner 1.75in port wall an outer wall of 2in thick with an net ft3 vol of 3.8cft so with walls this thick an a epoxy resin coat in an out i dont think id need any extra bracing the inner cab dims would be 35in h by 16.7in w by 12in d outer dim 38in h by 24in w by 15in (1.5iin front an back panels with a .5in flush cut for the driver) i plan to build two matching cab an run off either a Crown XLi 2500 750W 2-channel Power Amplifier or the Crown XLS 2502 775W 2-channel Power Amplifier whichever would be better with load an sinad you thoughts including paint on color