Bogen Communications AT35A 35W Attenuator for 25V or 70V SystemsBOGEN AT35A Attenuator for 25V 70V Speaker Line. The AT Series of attenuators allows the output level of a network of 25V or 70V speakers to be controlled from a wall mounted volume control, without affecting overall amplifier volume settings. The AT35A can handle speaker loads of up to 35W. Volume reduction takes place in 3 dB increments except for the two lowest settings, which provide 6 dB reduction increments. These rugged attenuators have 10