bandpasses are known for sounding awful. you get lots of loud bass, but its all muddled together like one note LOL...
saying a ported speaker "lets the speaker be maxed out" is a bit wrong. just play a ported sub and cover the port up. when its sealed, the sub moves a LOT more....
the only instance where a ported sub will move more is... near the tuning freq. or below, where the sub unloads and basically plays as if it was in free air.
ported boxes are much louder, but harder to "get it right" in terms of SQ. getting a flat alignment is harder...
"Thus creating thaty resistance the subs require w/o over exerting them when supplied high power at loud volumes"
possibly true, but the pressure on the subs is enormous. with to much power, cones always get blown off subs in bandpass boxes.