Bogen's AMBSQ1 and AMBSL1 speakers feature an all-steel surface-mounted enclosure with an 8" cone loudspeaker, built-in 1W amplifier, and volume control. The AMBSQ1 is suitable for ceiling or wall mounting. The AMBSL1 is designed primarily for wall mounting and its face is angled downward by 12.5 degrees. A detachable volume control knob on the grille allows individual adjustment of paging level at each speaker location.