{"product_id":"rdl-tx-pa40d","title":"RDL TX-PA40D – 40 W Stereo Amplifier, RCA Inputs","description":"\u003ch2\u003eWhat is the RDL TX-PA40D?\u003c\/h2\u003e\u003cp\u003eThe RDL TX-PA40D is a 40 W stereo Class D utility amplifier delivering 20 W RMS per channel into 8 Ω or 15 W per channel into 4 Ω. It is suited to fixed-gain applications where level is controlled by other equipment, such as projectors with variable audio outputs. A studio-quality compressor\/limiter controls clipping, and the power supply with North American cord is included.\u003c\/p\u003e\u003ch2\u003eHow does it work?\u003c\/h2\u003e\u003cp\u003e\u003cimg src=\"https:\/\/rdlnet.com\/wp-content\/uploads\/2024\/01\/tx-pa40d.jpg\" alt=\"RDL TX-PA40D 40 watt stereo amplifier\" style=\"max-width:100%;height:auto\" loading=\"lazy\"\u003e\u003c\/p\u003e\u003cp\u003eThe TX-PA40D has two unbalanced line-level inputs on gold-plated RCA jacks. Recessed front-panel trimmers set the output level for each channel across typical unbalanced signal levels. Each output drives a 4 Ω or 8 Ω speaker, or several speakers presenting that load, with impedance selected on the front panel. A front-panel switch sums the inputs to mono when speaker placement does not suit stereo. The stereo analog compressor\/limiter prevents clipping and, with higher input gain, raises average output beyond a standard 40 W amplifier. A red LED flashes at the compression threshold and stays dimly lit between flashes while compression is active. Compression uses three dynamic time constants and keeps audio clean for input overloads of up to 20 dB. The included supply accepts 100 to 240 Vac and powers the module at 24 Vdc, and the amplifier has thermal and short-circuit protection. The compact TX chassis mounts with RDL accessories such as the \u003ca href=\"https:\/\/creationnetworks.net\/products\/rdl-tx-hra3\"\u003eRDL TX-HRA3\u003c\/a\u003e or \u003ca href=\"https:\/\/creationnetworks.net\/products\/rdl-tx-ra5\"\u003eRDL TX-RA5\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eWhat are the key features?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e40 W stereo Class D\u003c\/strong\u003e — 20 W RMS per channel into 8 Ω or 15 W into 4 Ω.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRCA inputs\u003c\/strong\u003e — Gold-plated left and right unbalanced phono jacks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStereo or summed mono\u003c\/strong\u003e — Front-panel switch matches the speaker layout.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompressor\/limiter\u003c\/strong\u003e — Controls clipping and maximizes average output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelectable impedance\u003c\/strong\u003e — Outputs drive 4 or 8 ohm speakers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply included\u003c\/strong\u003e — 100 to 240 Vac supply with North American cord.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWhere is it typically used?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eConference room\u003c\/li\u003e\n\u003cli\u003eBoardroom\u003c\/li\u003e\n\u003cli\u003eTraining room\u003c\/li\u003e\n\u003cli\u003eHuddle room\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003cdiv style=\"overflow-x:auto;-webkit-overflow-scrolling:touch\"\u003e\u003ctable style=\"border-collapse:collapse;width:100%;min-width:300px;table-layout:fixed\"\u003e\n\u003ccolgroup\u003e\n\u003ccol style=\"width:44%\"\u003e\n\u003ccol style=\"width:56%\"\u003e\n\u003c\/colgroup\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eTX-PA40D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eInputs (2)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eLine level (-10 dBV nominal unbalanced), Left and Right\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eInput Impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e10 kΩ unbalanced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eGain Adjustments (2)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eSingle turn, one per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eMinimum Input Levels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e-18 dBV (to cross compressor threshold)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eMaximum Input Levels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e+15 dBV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eFrequency Response\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e20 Hz to 20 kHz (± 1 dB, 4 or 8 Ohms)*\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eTHD+N\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e\u0026lt; 0.1% (1 kHz, 1 W, 4 or 8 Ohms); \u0026lt; 1% (50 Hz to 20 kHz, 8 Ohms)* *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 style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eCompressor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\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 style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eCrosstalk\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eBetter than 60 dB (1 kHz, no compression)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eNoise\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e\u0026lt; -75 dB (below 20 W RMS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eSelectors\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eSlide switches: Output Impedance 4 Ohms or 8 Ohms; Input Mode SUMMED MONO or STEREO\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eOutput Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e20 W RMS into 8 Ω per channel, 40 W RMS total; 15 W RMS into 4 Ω per channel, 30 W RMS total\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eOutput Circuit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eClass D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eAmbient Operating Environment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e32° F to 104° F (0° C to 40° C) Maximum; 68° F (20° C) recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eIndicators (2)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eRed LED: THRESHOLD LED indicates compressor activity Blue LED: POWER on\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003ePower Requirement (Supply Included)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\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 style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e3.17\" (8.05 cm) W; 1.76\" (4.47 cm) H; 2.06\" (5.23 cm) D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eWhat power does it deliver?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003e20 W RMS per channel into 8 Ω (40 W total) or 15 W RMS per channel into 4 Ω (30 W total).\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eDoes it have remote volume control?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eRDL designs the TX-PA40D for fixed-gain use where level is controlled by other equipment. For remote VCA level control, RDL offers the RU-PA40D.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eWhat inputs does it have?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eLeft and right unbalanced -10 dBV inputs on RCA jacks.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eIs the power supply included?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eYes, with a North American cord. The TX-PA40DE export model excludes the cord.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eCan it run in mono?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eYes. A front-panel switch sums the inputs to mono.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eWhat warranty does it carry?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eThis product is covered by a 7-year RDL warranty. For warranty claims, RMAs or support, contact Creation Networks at (888) 230-3661 or sales@creationnetworks.net.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eCan Creation Networks help design the system?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eYes. Our team specifies, programs and installs classroom and conference room audio systems for commercial projects nationwide. Call (888) 230-3661 for a quote or design review.\u003c\/p\u003e\u003c\/details\u003e","brand":"RDL","offers":[{"title":"Default Title","offer_id":68025746686188,"sku":"TX-PA40D","price":332.52,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0603\/7982\/4364\/files\/tx-pa40d.jpg?v=1793777342","url":"https:\/\/creationnetworks.net\/products\/rdl-tx-pa40d","provider":"Creation Networks","version":"1.0","type":"link"}