The FP-PA20B is part of the group of versatile FLAT-PAK products from Radio Design Labs. The unique FLAT-PAK case can be directly screwed or bolted to cabinets or shelves. Optionally available rack-mounting accessories permit single or multiple FLAT-PAK module mounting.

APPLICATION: The FP-PA20B is the ideal choice in many applications where multiple 25 V speakers in a zone need to be powered from a single audio power amplifier.

The FP-PA20B features a balanced line level input that may be connected unbalanced. A front panel GAIN control is designed to be adjusted either manually or with a trimming screwdriver. The gain range will accommodate standard unbalanced levels as well as professional balanced levels. A 25 V amplified output is provided to drive corresponding speakers in a distributed sound system.

A red PEAK LED is provided to indicate the threshold of the integral compressor. Audio levels that could cause the amplified output to clip are compressed according to two dynamic time constants. Normal audio level signals remain unaffected by the compressor thereby preserving audio dynamics and preventing the compressor from increasing feedback potential when the amplifier is used for paging. The compressor is designed to remain aurally transparent while maintaining clean, unclipped amplified audio for input overloads of up to 20 dB. In addition to the compressor, an active filter circuit prevents saturation of the output transformer at low frequencies. The FP-PA20B produces average audio levels and audio clarity normally expected of amplifiers delivering much higher output power.

The durable construction and low profile of the FP-PA20B allow mounting in a wide range of locations not suited to a conventional style power amplifier. Power is provided to the module either through the barrier block or through the DC power jack. For continuous RMS output power, a 24 VDC 2A power supply is required. A 1A supply is sufficient for normal program audio levels and content. Power supplies are sold separately.

Wherever a high quality constant voltage audio power amplifier is needed to provide reliability, compactness and unsurpassed versatility, the FP-PA20B is the ideal choice. Use the FP-PA20B individually, or combine it with other RDL products as part of a complete audio/video system.