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TX-PA40D 40 W Stereo Audio Amplifier - 8 Ω, with Power Supply

TX-PA40D 40 W Stereo Audio Amplifier - 8 Ω, with Power Supply

Radio Design Labs - 40 W Stereo Audio Amplifier - 8 Ω, with Power Supply



  • Stereo Audio Power Amplifier
  • 20 Watts RMS per Channel into 8 Ω – 40 Watts Total
  • 15 Watts RMS per Channel into 4 Ω – 30 Watts Total
  • Left and Right Unbalanced Phono Jack Inputs
  • Switch‑Selectable Stereo or Mono Operation
  • Studio Quality, Aurally Transparent Compressor/Limiter
  • Compressor/Limiter Controls Clipping
  • Compressor Produces Maximized Average Output Power
  • Compression Enabled Using Input Level Adjustments
  • LED to Indicate Audio Compression Threshold
  • Outputs Drive 4 or 8 Ohm Speakers
  • High‑Efficiency Class D Operation
  • Thermal and Short‑Circuit Protection
  • TX‑PA40D includes North American Cord; TX‑PA40DE excludes Power Cord

The TX‑PA40D is the ideal choice in many applications where a high quality, high‑efficiency utility amplifier is needed to drive a pair of 4 Ω or 8 Ω speakers. It is specifically suited to fixed‑gain amplification applications where gain is controlled by other equipment. Examples include projectors with variable audio outputs used in classrooms, boardrooms and video conferencing.

The TX‑PA40D features two unbalanced line level inputs on high‑reliability gold plated phono (RCA) jacks. A front‑panel recessed gain control trimmer permits setting the desired amplifier output level for each channel. The gain range accommodates the range of typical unbalanced audio signal levels. Each of the two TX‑PA40D outputs will drive a 4 Ω or 8 Ω speaker or multiple speakers connected to present a 4 Ω or 8 Ω load to the amplifier. The output impedance is switch‑selectable on the front panel of the module.

A front‑panel switch is provided to sum the audio inputs to mono. In the STEREO mode, the TX‑PA40D independently amplifies each audio channel, left (L) and right (R). If speaker placement in the specified installation is incompatible with stereophonic amplification, the INPUT MODE switch may be set to SUMMED MONO.

The TX‑PA40D includes a stereo analog compressor/limiter for audio fidelity noticeably superior to conventional class D amplifiers with digital limiting. The input GAIN settings determine whether the limiter alone is used for clipping suppression, or if the full compressor/limiter will be used to substantially increase the average output power beyond that of a standard 40 W amplifier. A red front‑panel 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 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 TX‑PA40D, with compression, is capable of producing average audio output levels and clarity normally expected from stereo amplifiers with a much higher output power rating.

A blue POWER LED illuminates when the TX‑PA40D is powered from its external 24 Vdc power supply. The module is equipped with both thermal and output short‑circuit protection. The high‑efficiency Class D output stages produce minimal heat for all levels of expected voice or music modulation. Continuous full‑power operation with audio tones will not damage the amplifier, but is not recommended.

Wherever an ultra‑compact, high quality, high efficiency audio power amplifier is needed to provide reliability and unsurpassed versatility, the TX‑PA40D is the ideal choice. Use the TX‑PA40D individually, or combine it with other RDL products as part of a complete audio/video system.

Typical Performance:

Inputs (2):

Line level (‑10 dBV nominal unbalanced), Left and Right

Input Impedance:

10 kΩ unbalanced

Gain Adjustments (2):

Single turn, one per channel

Minimum Input Levels:

‑18 dBV (to cross compressor threshold)

Maximum Input Levels:

+15 dBV

Frequency Response:

20 Hz to 20 kHz (+/‑ 1 dB, 4 or 8 Ohms)*

THD+N:

< 0.1% (1 kHz, 1 W, 4 or 8 Ohms); < 1% (50 Hz to 20 kHz, 8 Ohms)*
*measured at compressor threshold level equaling 12 W RMS (8 Ohms) output power

Compressor:

Threshold nominally 2 dB below rated output, automatically adjusting attack and release times

Crosstalk:

Better than 60 dB (1 kHz, no compression)

Noise:

< ‑75 dB (below 20 W RMS)

Selectors:

Slide switches: Output Impedance 4 Ohms or 8 Ohms; Input Mode SUMMED MONO or STEREO

Output Power:

20 W RMS into 8 Ω per channel, 40 W RMS total; 15 W RMS into 4 Ω per channel, 30 W RMS total

Output Circuit:

Class D

Ambient Operating Environment:

0° C to 40° C Maximum; 20° C Recommended

Indicators (2):

Red LED: THRESHOLD LED indicates compressor activity
Blue LED: POWER on

Power Requirement (Supply Included):

Input: 100 to 240 VAC, 50 to 60 Hz, 1.5 A, IEC C14; Output to module: 24 Vdc


Stereo Audio Power Amplifier, 20 Watts RMS per Channel into 8 Ω – 40 Watts Total, 15 Watts RMS per Channel into 4 Ω – 30 Watts Total, Left Right Unbalanced Phono Jack Inputs, Switch-Selectable Stereo Mono Operation, Studio Quality, Aurally Transparent Compressor/Limiter, Compressor/Limiter Controls Clipping, Compressor Produces Maximized Average Output Power, Compression Enabled Using Input Level Adjustments, LED to Indicate Audio Compression Threshold, Outputs Drive 4 8 Ohm Speakers, High-Efficiency Class D Operation, Thermal Short-Circuit Protection, TX-PA40D includes North American Cord; TX-PA40DE excludes Power Cord, The TX-PA40D ideal choice in many applications where high quality, high-efficiency utility amplifier needed to drive pair of 4 Ω 8 Ω speakers It specifically suited to fixed-gain amplification applications where gain controlled other equipment Examples include projectors variable audio outputs used in classrooms, boardrooms video conferencing, The TX-PA40D features two unbalanced line level inputs high-reliability gold plated phono (RCA) jacks front-panel recessed gain control trimmer permits setting desired amplifier output level channel gain range accommodates range of typical unbalanced audio signal levels of two TX-PA40D outputs will drive 4 Ω 8 Ω speaker multiple speakers connected to present 4 Ω 8 Ω load to amplifier output impedance switch-selectable front panel of module, A front-panel switch provided to sum audio inputs to mono In STEREO mode, TX-PA40D independently amplifies audio channel, left (L) right (R) If speaker placement in specified installation incompatible stereophonic amplification, INPUT MODE switch set to SUMMED MONO , The TX-PA40D includes stereo analog compressor/limiter audio fidelity noticeably superior to conventional class D amplifiers digital limiting input GAIN settings determine whether limiter alone used clipping suppression, if full compressor/limiter will used to substantially increase average output power beyond that of standard 40 W amplifier red front-panel LED flashes when limiter preventing output clipping Normal audio level signals remain unaffected compressor thereby preserving audio dynamics If input level increased so compressor active, LED remains dimly lit between peak flashes audio compressed according to three dynamic time constants providing aural transparency while maintaining clean, unclipped amplified audio input overloads of up to 20 dB TX-PA40D, compression, capable of producing average audio output levels clarity normally expected from stereo amplifiers much higher output power rating, A blue POWER LED illuminates when TX-PA40D powered from its external 24 Vdc power supply module equipped both thermal output short-circuit protection high-efficiency Class D output stages produce minimal heat levels of expected voice music modulation Continuous full-power operation audio tones will not damage amplifier, but not recommended, Wherever an ultra-compact, high quality, high efficiency audio power amplifier needed to provide reliability unsurpassed versatility, TX-PA40D ideal choice Use TX-PA40D individually, combine it other RDL products part of complete audio/video system, format converter Data/Installation

Mounting Accessories:

Mounting Kit - RU, ST and TX SeriesMB-1
Mounting Kit - RU, ST and TX Series

Mounting Kit - RU and TX SeriesMB-2
Mounting Kit - RU and TX Series

Kit to Mount ST, TX Series Modules on FP PanelMB-3
Kit to Mount ST, TX Series Modules on FP Panel

STICK-ON Series Mounting Rack - 7 modulesSR-4
STICK-ON Series Mounting Rack - 7 modules

Single Wide Enclosure - RACK-UP MountsUC-1
Single Wide Enclosure - RACK-UP Mounts

Double Wide Enclosure - RACK-UP MountsUC-2
Double Wide Enclosure - RACK-UP Mounts

TX series DIN Rail AdapterDRA-35T
TX series DIN Rail Adapter

TX Series 19" Racking System - 5 modules 1RUTX-RA5
TX Series 19" Racking System - 5 modules 1RU

Pole Mount TrayPM-2T
Pole Mount Tray

Related Products:

FP-PA20
20 W Mono Audio Amplifier - 8 Ω

RU-PA518
10 W Stereo / 18 W Mono Audio Amplifier - 8 Ω

ST-PA18
18 W Mono Audio Amplifier - 8 Ω

ST-PA2
2 W Mono Audio Amplifier - 8 Ω

ST-PA6
6 W Mono Audio Amplifier - 8 Ω

RU-PA40D
40 W Stereo Audio Amplifier with VCA - 8 Ω, with Power Supply

EZ-MXA20
20 W Stereo Audio Mixer-Amplifier with EQ - 8 Ω, with Power Supply

EZ-PA20
20 W Stereo Audio Amplifier - 8 Ω, with Power Supply

PM-3T
Pole Mount Tray

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Copyright © 2010 Radio Design Labs, Inc. RDL, Radio Design Labs, the RDL logo, STICK-ON, RACK-UP and the Rack-Up logo are registered trademarks of Radio Design Labs, Inc. Flat-Pak, RCX, SourceFlex, SupplyFlex, Sure-Lok, TX, ULTRASTYLE, and Specialists in Practical Precision Engineering are trademarks of Radio Design Labs, Inc. All other trademarks are the property of their respective owners. Typical Performance reflects product at publication time exclusive of EMC data, if any, supplied with product. Date last modified: June 29 2010

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