Add $50.00 for FREE shipping

Powerful, Reliable Amplifier with Internal Compressor
Radio Design Labs FP-PA20 20W Mono Audio Amp,  8 Ohm
Radio Design Labs FP-PA20 20W Mono Audio Amp, 8 Ohm
Radio Design Labs FP-PA20 20W Mono Audio Amp, 8 Ohm
Item# 77989
Free shipping on orders over $50 - See Details


  • 20 watts RMS audio power amplifier
  • Output for 8 Ohm speaker
  • Maximized audio level at full power output
  • Superior audio quality at high output levels
  • Input / output terminal block connections
  • Line level balanced or unbalanced input

Essential Info

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

Also available in 70/100V and 25V versions.


More Info

  • Integral Audio Compressor to Control Clipping
  • High Overall Audio Operating Level
  • Peak LED to Indicate Audio Compression
  • Ultra-compact All Metal Construction
  • Convenience of RDL FLAT-PAKs
  • Specifications

    • Input: Line level(+4 dBu nominal balanced, -10 dBV nominal unbalanced)
    • Input Impedance: 20 kO balanced bridging/10 kO unbalanced
    • Input / Output Connectors: Plug-in terminal block
    • Gain Adjustment: Single turn audio taper
    • Minimum Input Levels: Balanced: -26 dBu (to cross compressor threshold), Unbalanced: -28 dBV (to cross compressor threshold)
    • Maximum Input Levels: Balanced: +23 dBu/Unbalanced: +15 dBV
    • Frequency Response: 35 Hz to 50 kHz (+/- 1.5 dB)*
    • THD+N: < 0.1% (@ 1 kHz)* < 0.5% (50 Hz to 20 kHz)*
    • Compressor: Threshold 6 dB below rated output, automatically adjusting attack and release times
    • Noise: <-80 dB (below 20 W RMS)
    • CMRR: > 55 dB (50 Hz to 120 Hz)
    • Output Power: 20 W RMS into 8 Ohms
    • Ambient Operating Environment: 0° C to 30° C Maximum; 20° C Recommended
    • Power Requirement: 24 Vdc @ 1650 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
      *measured at compressor threshold level equaling 4 W RMS output power


    Sign-up for Exclusive Email offers 
    How to Order Track Your Package Shipping Returns Contact Us Customer Service Retail Store
    Getting Started Learning Center FAQ Dealers Customer Testimonials Affiliate Program
    About Us INSTEON Press Awards Employment Guarantees Security & Privacy
    Free Catalog Email Newsletter Forum RSS Site Map
    Have questions? Call us at 800-762-7846 (Mon-Fri 5am-7pm and Sat 6am-3pm PT) or send us a message
    Place your order by 3pm PT for same day shipping
    Copyright 1995-2014 SMARTHOME™
    Verisign Secure Site PayPal Acceptance Mark