This seems to be the consensus with the people that I have spoke with who have had a chance to listen to a well built sealed sub. What's puzzling to me goes back to the first post, is why we are seeing a trend towards passive radiators with the large manufacturers? I would think that it would be more beneficial cost and profit wise, to manufacture and sell sealed subs as opposed to passive radiator designs.

Could it be a size decision? Passive radiator subs can utilize a smaller enclosure where a good sealed sub would have to house a 12 or 15 inch woofer which would require a larger box?