In 1971 after huge success with the EMT 140, EMT delivered the EMT 240 Reverb Foil. The surface of the vibrating 0.02 mm gold foil measured only 30 X 30 cm. The foil was contained in a double enclosure affording very high isolation from airborne and solid-borne disturbances, sufficient to allow placement of the EMT 240 even in mobile units or – at a sound pressure level of 105 dB – next to monitor loudspeakers
