Precision Audio and AV Interface Products

Radio Design Labs

FP-PA20A 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
  • Overview
  • Specifications
  • Related Products
  • Accessories
  • Downloads
  • How to Buy
  • Product Series
  • Dimensions

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.

Applications

Input / Output Connector:
Detachable terminal block
Input:
Line level (+4 dBu bal; -10 dBV unbal)
Input Impedance:
20 kΩ balanced bridging; 10 kΩ unbalanced
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:
50 Hz to 20 kHz (± 3 dB)*
THD+N:
< 0.1% (@ 1 kHz)*
< 0.5% (50 Hz to 20 kHz)*
*measured at compressor threshold level equaling 4 W RMS output power
Plenum Rating Standard:
UL 2043
Overall Dimensions:
Height: 2.3 in. (5.85 cm); Width: 3.25 in. (8.26 cm); Length: 6 in. (15.3 cm)
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 @ 70 V or 100 V
Ambient Operating Environment:
0° C to 30° C Max; 20° C Recommended
Indicators (2):
Red LED: PEAK LED indicates compressor activity
Green LED: Power ON
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.

Documents:
Format
PDF
CAD Files:
Format
High Res Images:
Format
Declaration of Conformity:
Format

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FLAT-PAK SERIES

FLAT-PAK products are high performance application-specific A/V, recording and broadcast modules constructed in compact, low-profile, shielded heavy duty metal chassis'. Module functions include pre-amplification, format conversion, line driving, power amplification, mixing, distribution, equalization, level control and more. The unique FLAT-PAK case can be directly screwed or bolted to cabinets or shelves. Rack mounting accessories permit mounting single or multiple FLAT-PAKs to front or rear rails. Adjacent mounting of FLAT-PAK modules is facilitated by daisy-chaining multiple modules from a single power supply using included power interconnect cables.

FLAT-PAK modules provide the most common connections in professional installations, including gold-plated jacks, detachable and fixed terminal blocks. Bold, high contrast labeling facilitates connection and adjustment in confined or dark locations. LED metering and indicators shorten setup and adjustment time. Signal connectors and switches are very high quality. Circuits are designed for studio quality performance and are engineered for extended service life.

A FLAT-PAK module may be mounted right where its function is needed. Multiple FLAT-PAK and other RDL modules can be used together to form all or part of an A/V system that precisely matches users’ needs. The high performance of these modules and the continuity in product offering and support makes FLAT-PAK modules a preferred long-term resource for system design solutions. FLAT-PAK SERIES modules are designed and manufactured in the U.S.A.

FP-PA20A FP-PA20A