20 W Mono Audio Amplifier - 70 V or 100 V

  • 20 Watts RMS Constant Voltage Amplifier
  • 70 V and 100 V Outputs
  • Integral Audio Compressor to Control Clipping
  • High Overall Operating Audio Level
  • Maximized Audio Level for Output Power
  • Audio Quality Superior to Standard Amplifiers
  • Plenum Rated per UL 2043 Standard
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The FP-PA20A 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. Both a 70 V and 100 V amplified output are 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-PA20A produces average audio levels and audio clarity normally expected of amplifiers delivering much higher output power.


Indicators (2):Red LED: PEAK LED indicates compressor activity
Green LED: Power ON
Ambient Operating Environment:0° C to 30° C Max; 20° C Recommended
CMRR:> 55 dB (50 Hz to 120 Hz)
Output Power:20 W RMS @ 70 V or 100 V
Compressor:Threshold 6 dB below rated output,automatic adjusting attack and release
Noise:< -80 dB (below 20 W RMS)
Overall Dimensions:Height: 2.3 in. (5.85 cm); Width: 3.25 in. (8.26 cm); Length: 6 in. (15.3 cm)
Gain Adjustment:Single turn audio taper
Plenum Rating Standard:UL 2043
THD+N:< 0.1% (@ 1 kHz)*
< 0.5% (50 Hz to 20 kHz)*
*measured at compressor threshold level equaling 4 W RMS output power
Frequency Response:50 Hz to 20 kHz (± 3 dB)*
Maximum Input Levels:Balanced: +23 dBu
Unbalanced: +15 dBV
Minimum Input Levels:Balanced: -26 dBu (to cross compressor threshold)
Unbalanced: -28 dBV (to cross compressor threshold)
Input / Output Connector:Detachable terminal block
Input Impedance:20 kΩ balanced bridging; 10 kΩ unbalanced
Input:Line level (+4 dBu bal; -10 dBV unbal)
Power Requirement:24 Vdc @ 1650 mA, Ground referenced(for continuous RMS power output)24 Vdc @ 1000 mA, Ground referenced (for normal uncompressed audio)
Package Type:Cardboard Box
WEEE weight:2.18 lbs.
Shipping Weight:2.395 lbs.
Tariff code:8543.70.9910
Package Dimensions:4.375 x 7 x 2.25 in.

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CAD FilesUnitsFormat
Engineering Functional BlockAmericanDXF
Panel Diagram - FrontAmericanDXF
Panel Diagram - FrontMetricDXF
High Res ImagesFormat
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