A loudspeaker enclosure, with an open port cut into the front baffle. Also called a bass reflex enclosure.
"Hi Christian - I played my Itunes playlist with the files I had imported form your CD. The sound was absolutely fantastic! The exquisite harmony that group had has never been duplicated(in my opinion), and it sounded every bit as good as the origianl record! Thanks so much, and I will soon have a couple more records to you. "