{"product_id":"rdl-tx-pa40d","title":"RDL TX-PA40D","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cp\u003eThe 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.\u003c\/p\u003e\u003cp\u003eThe 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 ? or 8 ? load to the amplifier. The output impedance is switch-selectable on the front panel of the module.\u003c\/p\u003e\u003cp\u003eA front-panel switch is provided to sum the audio inputs to mono. In the \u003cb\u003eSTEREO\u003c\/b\u003e mode, the TX-PA40D independently amplifies each audio channel, left (\u003cb\u003eL\u003c\/b\u003e) and right (\u003cb\u003eR\u003c\/b\u003e). If speaker placement in the specified installation is incompatible with stereophonic amplification, the \u003cb\u003eINPUT MODE\u003c\/b\u003e switch may be set to \u003cb\u003eSUMMED MONO\u003c\/b\u003e.\u003c\/p\u003e\u003cp\u003eThe TX-PA40D includes a stereo analog compressor\/limiter for audio fidelity noticeably superior to conventional class D amplifiers with digital limiting. The input \u003cb\u003eGAIN\u003c\/b\u003e 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.\u003c\/p\u003e\u003cp\u003eA blue \u003cb\u003ePOWER\u003c\/b\u003e 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.\u003c\/p\u003e\u003cp\u003eWherever 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.\u003c\/p\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\tStereo Audio Power Amplifier\u003c\/li\u003e\n\u003cli\u003e20 Watts RMS per Channel into 8 Ω - 40 Watts Total\u003c\/li\u003e\n\u003cli\u003e15 Watts RMS per Channel into 4 Ω - 30 Watts Total\u003c\/li\u003e\n\u003cli\u003eLeft and Right Unbalanced Phono Jack Inputs\u003c\/li\u003e\n\u003cli\u003eSwitch-Selectable Stereo or Mono Operation\u003c\/li\u003e\n\u003cli\u003eStudio Quality, Aurally Transparent Compressor\/Limiter\u003c\/li\u003e\n\u003cli\u003eCompressor\/Limiter Controls Clipping\u003c\/li\u003e\n\u003cli\u003eCompressor Produces Maximized Average Output Power\u003c\/li\u003e\n\u003cli\u003eCompression Enabled Using Input Level Adjustments\u003c\/li\u003e\n\u003cli\u003eLED to Indicate Audio Compression Threshold\u003c\/li\u003e\n\u003cli\u003eOutputs Drive 4 or 8 Ohm Speakers\u003c\/li\u003e\n\u003cli\u003eHigh-Efficiency Class D Operation\u003c\/li\u003e\n\u003cli\u003eThermal and Short-Circuit Protection\u003c\/li\u003e\n\u003cli\u003eTX-PA40D includes North American Cord; TX-PA40DE excludes Power Cord\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable class=\"table1\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eInputs (2)\u003c\/td\u003e\n\u003ctd\u003eLine level (-10 dBV nominal unbalanced), Left and Right\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Impedance\u003c\/td\u003e\n\u003ctd\u003e10 k? unbalanced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGain Adjustments (2)\u003c\/td\u003e\n\u003ctd\u003eSingle turn, one per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMinimum Input Levels\u003c\/td\u003e\n\u003ctd\u003e-18 dBV (to cross compressor threshold)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaximum Input Levels\u003c\/td\u003e\n\u003ctd\u003e+15 dBV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency Response\u003c\/td\u003e\n\u003ctd\u003e20 Hz to 20 kHz (± 1 dB, 4 or 8 Ohms)*\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTHD+N\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 0.1% (1 kHz, 1 W, 4 or 8 Ohms); \u0026lt; 1% (50 Hz to 20 kHz, 8 Ohms)*\u003cbr\u003e*measured at compressor threshold level equaling 12 W RMS (8 Ohms) output power\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompressor\u003c\/td\u003e\n\u003ctd\u003eThreshold nominally 2 dB below rated output, automatically adjusting attack and release times\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCrosstalk\u003c\/td\u003e\n\u003ctd\u003eBetter than 60 dB (1 kHz, no compression)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNoise\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; -75 dB (below 20 W RMS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSelectors\u003c\/td\u003e\n\u003ctd\u003eSlide switches: Output Impedance 4 Ohms or 8 Ohms; Input Mode \u003cb\u003eSUMMED MONO\u003c\/b\u003e or \u003cb\u003eSTEREO\u003c\/b\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Power\u003c\/td\u003e\n\u003ctd\u003e20 W RMS into 8 ? per channel, 40 W RMS total; 15 W RMS into 4 ? per channel, 30 W RMS total\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Circuit\u003c\/td\u003e\n\u003ctd\u003eClass D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAmbient Operating Environment\u003c\/td\u003e\n\u003ctd\u003e0° C to 40° C Maximum; 20° C Recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIndicators (2)\u003c\/td\u003e\n\u003ctd\u003eRed LED: \u003cb\u003eTHRESHOLD\u003c\/b\u003e LED indicates compressor activity\u003cbr\u003eBlue LED: \u003cb\u003ePOWER\u003c\/b\u003e on\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Requirement (Supply Included)\u003c\/td\u003e\n\u003ctd\u003eInput: 100 to 240 VAC, 50 to 60 Hz, 1.5 A, IEC C14; Output to module: 24 Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage Type\u003c\/td\u003e\n\u003ctd\u003eCardboard Box\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage Dimensions\u003c\/td\u003e\n\u003ctd\u003e5.125 x 2.5 x 5.875 in.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eShipping Weight\u003c\/td\u003e\n\u003ctd\u003e1.655 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWEEE weight\u003c\/td\u003e\n\u003ctd\u003e1.525 lbs.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTariff code\u003c\/td\u003e\n\u003ctd\u003e8518.50.0000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"RDL","offers":[{"title":"Default Title","offer_id":43895110828075,"sku":"RDL-TX-PA40D","price":312.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0642\/3019\/5243\/files\/rdl-tx-pa40d-2_1__61262.1682443550.1280.1280.jpg?v=1775684057","url":"https:\/\/www.empirepro.com\/products\/rdl-tx-pa40d","provider":"Empire Pro","version":"1.0","type":"link"}