The AtlasIED VTB series models are environmentally friendly speakers designed for intercom communication. VTB models feature an integral exponential horn to provide reliable sound distribution and optimal intelligibility for the reproduction of voice signals and/or electric tones. The units have a frequency response of 600 Hz to 55 kHz and are offered in six models to meet application requirements. The VTB-1 and VTB-2 series models are 8 and 4 ohm units, respectively. Models VTB-3 to VTB-6 are equipped with a built-in transformer. Termination is via 6" color-coded wire leads. Units are constructed of die-cast zinc with a water-sealed controller that will resist moisture, corrosion, vibration, insects, and vandalism. Models are available with a choice of multi-tap transformers and are designed to mount a variety of standard or custom enclosures and faceplates to meet installation and application requirements. VTB Series units will provide years of trouble-free service in stationary or mobile applications both indoors and outdoors.