I've been seeing how sealed enclosures is refered to as a SQ enclosure and know that it is very misleading. SQ should be a term to mean how well the sound is reproduced. If you think about it, sealed has many limitations that would not justify it as SQ.
A sealed box is a permanent suspension counter on a woofer, which basically strongly restricts cone movement. With the highly restricted cone movement, the woofer losses the ability to fully reproduce all the low frequencies well. Example; a humans sound system (our voice) is a ported system. The port is our nose. Start to hum, then plug your nose and hum. You hear and feel the difference. Its much harder to make the sound and its not as loud.
First off I can respect the fact that some people don't like boom, wave, extended bass (what-ever else its called). Another fact is, its supposed to sound like that. I'm going of hip-hop for this. Example; Warren G's track, "This DJ". It's is a boom-bass heavy track. If you play that in a sealed box, you hear the faint struggling boom and heavy kick drum. Play it, in a vented box and the boom comes out in full force.
The woofer in a vented box is less restriced by air pressure and the cone can more accuratly, to vibrate the -boom- sound, that your supposed to hear as Warren G produced. I believe in opinions of ones self to be valid, thats why I dis-agree with SQ refering to sealed universaly. If anything, vented is the true SQ enclosure.
So SQ should not be used to describe enclosure types, only woofer brands themselves.