When I use the expression 'tight bass', I'm not talking frequency. I'm refering to a subs ability to follow a musical note clearly and accurately.

The ports on a box allow for more air moved per watt used. Sealing a box creates a spring effect inside the box that helps the driver rebound quicker per watt used.

These examples are for equal power supplies pushing equally efficient drivers.

My Stuff :

M80's
QS8's
VP150
EP800
Denon 4802
Emotiva XPA-3
Samsung BD-P3600
Sharp 65 Inch Aquos LCD