Sound Masking

275 CID Economy Assembly, 4W-70V transformer

690 CID "Quiet Steel" Assembly, 4W-70V rotary select transformer, CITY OF CHICAGO-APPROVED

690 CID Standard Assembly, 4W-70V rotary select transformer, CITY OF CHICAGO-APPROVED

617 CID Grid Mount, Composite Back box Assembly, 4W-70V rotary select transformer

Bi-Directional Sound Masking Loudspeaker Assembly, Dual 4" O.D. Speakers, 4W-70V Rotary Select Transformer