RDL FP-PA18H 18W Mono Hi-Temp Audio Amplifier

RDL FP-PA18H 18W Mono Hi-Temp Audio Amplifier

RDL FP-PA18H 18W Mono Hi-Temp Audio Amplifier


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RDL FP-PA18H overview

  • 1Description

The RDL FP-PA18H 18W Mono Hi-Temp Audio Amplifier features a balanced line level input that may be connected to an unbalanced audio source. A gain control located next to the terminal block is designed to be adjusted manually or with a trimming screwdriver (not included). The gain range will accommodate standard unbalanced levels as well as professional balanced levels. The output drives one 8Ω speaker or multiple speakers connected to present an 8Ω load to the amplifier.

The class D amplifier includes an analog compressor/limiter for fidelity with digital limiting. The input gain setting determines whether the limiter alone is used for clipping suppression, or if the full compressor/limiter will be used to increase the average output power. A red compression LED flashes when the limiter is preventing output clipping. Normal audio level signals remain unaffected by the compressor thereby preserving audio dynamics. If the input level is increased so that the compressor is active, the LED remains dimly lit between peak flashes. The audio is compressed according to three dynamic time constants providing aural transparency while maintaining clean, unclipped amplified audio for input overloads of up to 20 dB.

The output stage includes an audio detector that illuminates the green output active LED and provides an active open collector output when the output stage is active. This output is useful to control other equipment or to verify amplifier operation using high or low frequency low level test tones. The detector triggers with only 30mW of output power at 20 Hz or 5mW of output power at 20 kHz.

A blue power LED illuminates when the adapter is powered from an 24 VDC power supply. The module is equipped with both thermal and output short circuit protection. The class D output stage produces minimal heat for all levels of expected voice or music modulation. The thermal characteristics of the module case and construction permit operation over a range of 32 to 158°F. It is suitable for outdoor applications, signage, and other installations where ambient temperatures may become elevated due to limited convection.

Note: The power supply must be mounted in a location with a maximum ambient temperature of 40°C.

18W RMS power output
8Ω impedance
Operation in elevated ambient temperatures up to 158°F (70°C)
Input/output detachable terminal block connections
Line level balanced or unbalanced input
Compressor/limiter controls clipping
LED to indicate audio compression threshold
Compressor produces maximized average output power
Class D amplifier operation
Thermal and short circuit protection
Compact all metal construction
UPC: 813721012685
In the Box
RDL FP-PA18H 18W Mono Hi-Temp Audio Amplifier
  • Power Supply
  • Limited 3-Year Warranty
  • Table of Contents
    • 1Description

    RDL FP-PA18H specs

    Input Line level (4 dBu nominal balanced; 10 dBV nominal unbalanced)
    Input Impedance 10 kΩ balanced bridging; 5 kΩ unbalanced
    Gain Adjustment Single turn audio taper
    Levels Minimum Input Levels
    Balanced: 18 dBu (to cross compressor threshold)
    Unbalanced: 20 dBV (to cross compressor threshold)

    Maximum Input Levels
    Balanced: 23 dBu
    Unbalanced: 21 dBV
    Frequency Response 20 Hz to 20 kHz (+/ 1 dB)

    Measured at compressor threshold level equaling 12 W RMS output power

    THD + N < 0.5% (20 Hz to 20 kHz)

    Measured at compressor threshold level equaling 12 W RMS output power

    Compressor Threshold 3 dB below rated output, automatically adjusting attack and release times
    CMRR > 45 dB (50 Hz to 3 kHz)
    Noise < 72 dB (below 18 W RMS, 4 dBu input)
    Output Power 18 W RMS into 8 Ω
    Output Circuit Class D
    Threshold Output Signal Detector Threshold: 30 mW @ 20 Hz; 20 mW @ 30 Hz; 10 mW @ 50 Hz; 5 mW @ 65 Hz through 20 kHz
    Output Output Signal Detector Output: Open collector, 5 mA
    Indicators Red LED: Comp LED indicates compressor activity
    Green LED: Output active (controlled by output signal detector)
    Blue LED: Power on
    24 Vdc Power Supply Current 80 mA (idle), 975 mA (maximum), ground referenced
    Power Supply 100 to 240 VAC, 50/60 Hz, 1 A maximum; 24 VDC output to module
    Ambient Operating Environment 32 to 158°F (0 to 70°C)
    Dimensions (H x W x L) 1.15 x 3.25 x 3.00" (2.92 x 8.26 x 7.62 cm)
    Packaging Info
    Package Weight 1.1 lb
    Box Dimensions (LxWxH) 7.2 x 5.1 x 2.5"

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