This unit was developed using the expertise of professional sound engineers and working musicians. You will find that your new NADY AUDIO HPA-4 has superior performance and greater flexibility than any other headphone/ amplifier/line distributors in its price range. Please read this manual carefully to get the most out of your new unit.
ATTENTION RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR IMPORTANT SAFETY INSTRUCTIONS When using this electronic device, basic precautions should always be taken, including the following: Read all instructions before using the product. Do not use this product near water (e.g., near a bathtub, washbowl, kitchen sink, in a wet basement, or near a swimming pool, etc.).
RACK MOUNTING The HPA-4 fits into one standard 19" rack unit of space (1 3/4"). Parts of the unit can become very warm during use. This is normal during operation. Care should be taken to ensure that there is enough space around the unit for cooling (at least 12” or 30cm). Do not place the HPA-4 on high temperature devices such as power amplifiers, etc., or the unit may overheat in operation.
Each channel features a rotary selector switch which allows you to select any of the 4 stereo input source signals connected to the INPUTS (3) of the HPA-4 to be routed to the selected chan- nels of the headphone amplifier and line distribution output. Sim- ply choose the source signal desired for that channel.
USING THE HPA-4 AS A LINE DISTRIBUTION UNIT To use the HPA-4 as a line distribution unit all you have to do is use the line output instead of the headphone output on the front of the unit for the line distribution signal feed. All other operation is identical as using the unit as a headphone amplifier.
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DO NOT ATTEMPT TO SERVICE THIS UNIT YOURSELF AS IT CAN BE DANGEROUS AND WILL ALSO VOID THE WARRANTY. NADY SYSTEMS, INC. • 6701 SHELLMOUND STREET, EMERYVILLE, CA 94608 Tel: 510.652.2411 • Fax: 510.652.5075 • www.nady.com...