The AT series industry standard auto transformer. High-quality auto transformer series provides the advantages of excellent frequency response, low insertion loss and reliable performance for volume control application in 25V/70.7V systems. Attenuation is accomplished in ten make before break steps plus positive off position (no stop between maximum and Off position to prevent switch damage). Contacts are silver plated for noise-free operation. Features a removable terminal block. Includes stainless steel plate, with stamped and filled or screen printed dial scale and a skirted black knob. (White and ivory plastic plates with matching skirted knobs also available in Decora style-see AT model description chart).

E408 auto transformer with precision level control. Specially designed for attenuation in masking and sound reinforcement systems where fine tuning of level control is required. Employs a ten-position, non-shorting rotary switch without stop. Attenuation rate is 1.5dB per step (all other specifications are the same as the AT Series including the UL listing).

PA series priority paging option. Priority paging feature by-passes the effect of the attenuator to provide program level selection of individual emergency and paging signals at the amplifier. Option is available on all AT attenuators. The SPDT relay is operated with 24V DC at 10mA. Includes protective relay cover to ensure lasting trouble-free performance. Terminations to the relay and attenuator are made via a removable terminal block (all other specifications except for dimensions are the same as selected AT models).

RM series rack mount option. For attenuation convenience of rack-mounted equipment in cabinets and consoles, the AT, E408 series attenuators are available without mounting plate for rack panel installation. Attractive matte black polycarbonate dial scale overlay with adhesive backing replaces the mounting plate. Includes skirted black knob. Overlay size is 29 square (51mm) (to order, simply add RM after the selected attenuator model number. example: AT10-RM or AT10-PARM, dial scale overlays to retrofit existing installations are available, see model HX23).