High-impedance (primary) volume controller with autotransformer, 40 W/100 V, 3/4-wire mandatory listening (24V relay), priority channel switching, white/black/silver knob, without frame. • The AT 40T volume control features a control circuit with a selector and a separate transformer. • Designed for use in 100 V line systems to adjust the volume of a loudspeaker group with a total power not exceeding 40 W. • All connected loudspeakers must have 100 V line matching transformers. • Equipped with a 24 V DC override relay to bypass the selector or introduce a second 100 V line for paging unaffected by volume control. • Can operate with 3-wire lines for emergency announcements without using the internal 24 V DC relay. • Installation on any standard European electrical wall plate by drilling a hole and securing the control circuit. • Includes three knobs in white, silver, and anthracite. Transformer can be placed inside a wall or flush-mounted box if space allows. Features: • Attenuator for constant voltage systems, max 20W • Universal mounting on any standard European electrical wall plate. • 5 selectable positions + OFF volume control General specifications: • Input voltage: 100 V • Output voltage: 100 – 70 – 50 – 35 – 25 – 0 V • Maximum power: 40 W • Attenuation: 0 dB – 3 dB – 6 dB – 9 dB – 12 dB – OFF • Max Depth: 58 / 2.28 mm/inch Physical specifications: • Height: 38 / 1.49 mm/inch • Width: 43 / 1.69 mm/inch • Depth: 32 / 1.25 mm/inch • Net Weight: 0.24 / 0.52 Kg/Lbs Shipping information: • Package height: 120 / 4.72 mm/inch • Package width: 70 / 2.75 mm/inch • Package depth: 75 / 2.95 mm/inch