I have read bits and pieces about this - what's peoples opinions? My reason for asking is that I have bought an Ashdown 610 cab new. It's seen minimal rehearsal (probably 10-20), maybe a handful of live gigs (8-10) and not much home use, not at loud levels anyway. Now when I start to push this cab it starts to fart and distort at a lower volume than I think it should - sure it's loud before it starts, but in my opinion a 4 ohm, 900 watt cab should be making my hair move before it distorts, but maybe I'm wrong. It is a fully sealed cab. Would this have less perceived volume than a ported cab? And could the speaker's need a little breaking in to perform a little more loudly without distorting?