They came in 4.5 cuft vented enclosures. This matches the minimum recommended in the E.V. information sheet I got on this site. I changed the enclosure grilles to lose the broken wood lattice work and then sanded then down to new wood and went from fruitwood or dirty pecan to light oak. They look very nice in their new contemporary clothes. A larger enclosure, of maybe 5.5 cuft might be better but these have a very quick and clean bass as is. One inmate recommended 5 ft sealed and the t/s does suggest this. I tried sealed and the bass was tighter but midranges bloated. Not my cup of whatever. These speakers are like the Altec a-7 in that folks who are not into speakers hear them playing and comment on how natural the music sounds. tdc