Radio Design Labs FP-PA20B
20W Power Amplifier with 25V Output


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Radio Design Labs' 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. Audio levels that could cause the amplified output to clip are compressed using two dynamic time constants designed to preserve aural transparency. 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 FP-PA20B produces average audio levels and audio clarity normally expected of amplifiers delivering much higher output power.

NOTE: 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.


  • 20 Watts RMS Constant Voltage Amplifier
  • 25 V Output
  • Integral Audio Compressor to Control Clipping
  • High Overall Operating Audio Level
  • Maximized Audio Level for Output Power
  • Audio Quality Superior to Standard Amplifiers


  • Input: Line level (+4 dBu bal; -10 dBV unbal)
  • Input Impedance: 20 kO balanced bridging; 10 kO unbal
  • Input / Output Connector: Plug-in terminal block
  • Gain Adjustment: Single turn audio taper
  • Minimum Input Levels: Balanced:-26 dBu (to cross compressor threshold),Unbalanced: 50 Hz to 18 kHz (+/- 3 dB)
  • THD+N: < 0.1% (@ 1 kHz),< 0.5% (50 Hz to 20 kHz)
  • Noise: < -80 dB (below 20 W RMS)
  • Compressor: Threshold 6 dB below rated output, automatic adjusting attack and release
  • CMRR: > 55 dB (50 Hz to 120 Hz)
  • Output Power: 20 W RMS @ 25 V
  • Ambient Operating Environment: 0° C to 30° C Max; 20° C Recommended
  • Power Requirement: 24 Vdc @ 2000 mA, Ground referenced(for continuous RMSpower output), 24 to 33 Vdc @ 1000 mA, Ground referenced (for normaluncompressed audio)
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Radio Design Labs' PS24V2A is a 24 volt DC Switching Power Supply, with North American cord, 2 Amp output and DC Plug. Input:  100 to 240 VAC Output:  24 Vdc, 2 A (UL, CSA) Dimensions:  2 in. (5 cm) x 1.33 ...

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The PM-1T is a tray that mounts above a projector using a standard (1.5" I.D.) round projector pole or any smaller round or rectangular pole. The tray accommodates up to two FP-PA20 Audio Power Amplifiers (for stereo operation) and two ...

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Din Rail Mounting BracketRadio Design Labs DRA-35F Din Rail Mounting Bracket

The DRA-35F is a DIN rail mounting bracket that provides positive mounting for any RDL FLAT-PAK™ module. DIN rail mounting is ideal in locations subject to vibration, in confined spaces or where traditional rack mounting is not desired. ...

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