RDL FP-PA20A Manual

RDL Modtager FP-PA20A

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FLAT-PAK™ SERIES

Model FP-PA20B

20 W Audio Power Amplifier

 20 Watts RMS Constant Voltage Amplifier

 25 V Output

 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

The FP-PA20B 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.

APPLICATION: The FP-PA20B is the ideal choice in many applications where multiple 25 V speakers in a

zone need to be powered from a single audio power amplifier.

The 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.

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. In addition to the compressor, an active filter circuit prevents saturation of the output

transformer at low frequencies. The FP-PA20B produces average audio levels and audio clarity normally

expected of amplifiers delivering much higher output power.

The durable construction and low profile of the FP-PA20B 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 continuous RMS output power, a 24 VDC 2A power supply is

required. A 1A supply is sufficient for normal program audio levels and content. Power supplies are sold

separately.

Wherever a high quality constant voltage audio power amplifier is needed to provide reliability, compactness

and unsurpassed versatility, the FP-PA20B is the ideal choice. Use the FP-PA20B individually, or combine it

with other RDL products as part of a complete audio/video system.

RDL 



 659 6

th St. 



 Prescott, AZ., USA 86301 



 (928) 443-9391 



 



 FAX (928) 443-9392 www.rdlnet.com

FLAT-PAK™

SERIES

Model FP-PA20B

20 W Audio Power Amplifier

TYPICAL PERFORMANCE

Input: Line level

(+4 dBu nominal balanced)

(-10 dBV nominal unbalanced)

Input Impedance: 20 k balanced bridging

10 k 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: 50 Hz to 18 kHz (+/- 3 dB)*

THD+N: < 0.1% (@ 1 kHz)*

< 0.5% (50 Hz to 20 kHz)*

Compressor: Threshold 6 dB below rated output,

automatic adjusting attack and release

Noise: <-80 dB (below 20 W RMS)

CMRR: > 55 dB (50 Hz to 120 Hz)

Output Power: 20 W RMS @ 25 V

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

Overall Dimensions: Height: 2.30 in. 5.85 cm

Width: 3.25 in. 8.26 cm

Length: 6.04 in. 15.3 cm

Installation/Operation

Declaration of Conformity available from rdlnet.com.

Sole EMC specifications provided on product package.

Specifications are subject to change without notice.

Radio Design Labs Technical Support Centers

U.S.A. (800) 933-1780, (928) 778-3554; Fax: (928) 778-3506

Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287

891-2115C

COMPRESSION

OUTPUT SIGNAL

-40 dB -20 dB 0 dB

20 W

-40 dB

-30 dB

-20 dB

-10 dB

0 dB

INPUT SIGNAL

Produkt Specifikationer

Mærke:	RDL
Kategori:	Modtager
Model:	FP-PA20A

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