The amt Monitor is the ultimate ESS loudspeaker. lt is sonically distinguished from all other ESS Speaker by its unmatched excellence. An extremely "open" sounding bi-polar Heil air-motion transformer couples to an exceptionally high transmission 12" Bextrene low frequency driver, specially designed for this system. A newly designed diaphragm and a newly devised 18 dB per octive crossover that integrates the air-motion transformer and bass driver result in improved midrange performance free of phase distor- tion. Bass performance below 30 Hz is assured by a structurally reinforced cabinet of exceptionally large internal volume and by a front mounted passive radiator.