20W, 8 Ohm Audio Power Amplifier

OUR PART #:  FP-PA20 Write the First Review.

Our Price: $155.02
List Price: $207.36
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  • 20 Watts RMS Audio Power Amplifier
  • Output for 8 Ohm Speaker
  • Maximized Audio Level for Output Power
  • Audio Quality Superior to Standard Amplifiers
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The Radio Design Labs FP-PA20 is the ideal choice in many applications where a high quality utility amplifier is needed to drive an 8 ohm speaker.

The FP-PA20 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.

The FP-PA20 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. The output will drive an 8 ohm speaker or multiple speakers connected to present an 8 ohm load to the amplifier.

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. The FP-PA20 produces average audio levels and audio clarity normally expected of amplifiers delivering much high output power.

The durable construction and low profile of the FP-PA20 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 full RMS output power, a 24 VDC 2 Amp power supply is required. A 1 Amp supply is sufficient for normal program audio levels and content. Power supplies are sold separately.

Wherever a high quality audio power amplifier is needed to provide reliability, compactness and unsurpassed versatility, the FP-PA20 is the ideal choice. Use the FP-PA20 individually, or combine it with other RDL products as part of a complete audio/video system.

Radio Design Labs FP-PA20 Features:

  • 20 Watts RMS Audio Power Amplifier
  • Output for 8 Ohm Speaker
  • Maximized Audio Level for Output Power
  • Audio Quality Superior to Standard Amplifiers
  • Input/Output Terminal Block Connections
  • Line Level Balanced or Unbalanced Input
  • Integral Audio Compressor to Control Clipping
  • High Overall Operating Audio Level
  • Peak LED to Indicate Audio Compression
  • Ultra-compact All Metal Construction
  • Convenience of RDL FLAT-PAKs

Radio Design Labs FP-PA20 Specifications:

  • Input: Line Level (+4dBu nominal balanced, -10dBV nominal unbalanced)
  • Input Impedance: 20 kohm balanced bridging; 10 kohm unbalanced
  • Gain Adjustment: Single turn audio taper
  • Minimum Input Levels: Balanced - +23 dBu; Unbalanced - +15 dBV
  • Maximum Input Levels: Balanced - -26 dBu; Unbalanced - -28 dBV (to cross compressor threshold)
  • Frequency Response: 35Hz to 50kHz (+/-1.5dB)
  • THD+N: < 0.1% (@ 1kHz)
  • Compressor: Threshold of 6dB below rated output, automatic adjusting attack and release
  • CMRR: >55dB (50Hz to 120Hz)
  • Output Power: 20W RMS into 8 ohms
  • Power Requirement: 24 VDC @ 2000 mA (for continuous RMS power output,Ground referenced); 24 to 33 VDC @ 1000 mA (for normal program material with minimal compression, Ground referenced)
  • Indicators (2): Red LED - PEAK LED indicates compressor activity; Green LED: Power ON
  • Overall Dimensions: 2.3" H x 3.25" W x 6.04" L


Radio Design Labs' PS-24V2A power supply is NOT included but is required in order to power this product. Please see the "Accessories" tab or click here for more information on the PS-24V2A power supply.

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