So, my emphasis on the AND in the subject line of the thread is not to indicate that I'm trying to decide on either sealed or ported designs. Both have their merits and ultimately it matters about their design. Just because a cabinet is either ported or sealed which you can visibly see doesn't necessarily mean anything..........until you try it! My question is with today modern designs what are some of the efficient designs available? Efficient in terms of perceived volume output to power input for the amplification of bass guitar! And with more meaning, I'm looking for cabinets that produce decent midrange frequencies with respect to the bass. Not try to just focus on 30Hz for the Low B or 40Hz for the Low E. So, what are efficient bass cabinets available? Please enjoy posting and most of all....have fun! Happy Holidays everyone!