The Valcom V-2994 Page Port Preamp/ Expander is a solid-state audio preamplifier which can be mounted into a single-gang electrical box. The amplifier will accept a high impedance input (600 Ohms) and reduce it to a low impedance output. When the control knob is set on 5, the input signal level equals the output signal level. The V-2994 is capable of driving 150 Valcom one-way speaker/amplifier assemblies. Specifications: • To interface 600 Ohm type page ports to up to 150 Valcom amplified speakers • To expand the number of Valcom amplified speakers on a zone by 150 • To pre-amp audio signal on long lines to Valcom amplified speakers • To provide master volume control convenience to all or a portion of a paging zone