thats just experience, generally the coupled output produces much more than the ordinary ported design, actually sometimes more than 5 db's but i desided 3 was a safer number since avoiding criticism has to be a concern on this forum for your opinion to be considered valid, all it takes is a misspelled word or a mixed up thought for people to call you an idiot... most people on here are looking for flaws of others to hold on to so that they can act more knowledgeable themselfs, instead of focusing on the arguement or subject matter, they focus on how clever they can be it their "flames"... this is immature, unnecessary, an uncouth in all degree's and situations... dissagreeing with someone is one matter, but using a dissagreement as an excuse to start an internet pissing match is inexcuseable...