{"product_id":"rdl-ru-mx4l","title":"RDL RU-MX4L – 4-Input Line Mixer, Mic and Line Outputs","description":"\u003ch2\u003eWhat is the RDL RU-MX4L?\u003c\/h2\u003e\u003cp\u003eThe RDL RU-MX4L is a four-channel line-level audio mixer that combines balanced XLR and unbalanced phono sources into one balanced output. The balanced XLR output is switchable between line and mic level, so the mix can feed a mixer, amplifier or mic input. Per-channel VU meters and an LED string mix meter make level setting fast in rack-mounted AV systems.\u003c\/p\u003e\u003ch2\u003eHow does it work?\u003c\/h2\u003e\u003cp\u003e\u003cimg src=\"https:\/\/rdlnet.com\/wp-content\/uploads\/2024\/01\/ru-mx4l.jpg\" alt=\"RDL RU-MX4L 4-Input Line Mixer, Mic and Line Outputs\" style=\"max-width:100%;height:auto\" loading=\"lazy\"\u003e\u003c\/p\u003e\u003cp\u003eEach of the four inputs accepts either a balanced XLR line-level source or an unbalanced phono jack source. Balanced inputs are 20 kΩ bridging with an input range of -13 to +22 dBu, while unbalanced inputs accept -25 dBV to +20 dBV for +4 dBu output. Front-panel controls set each channel level, with up to 17 dB of gain on balanced inputs and 27 dB on unbalanced inputs, plus an output attenuator. Every input has a dual-LED VU meter that follows standard VU ballistics, and the final mix is shown on an LED string meter with an arc motion. The balanced 150 Ω output runs at +4 dBu and switches to mic level (-45 dBu) when needed, and an unbalanced -10 dBV LINE OUTPUT is also provided. The unbalanced output can feed the DIRECT input of another RU-MX4L or an RU-MX4 to expand the number of channels. For transformer output isolation, order the \u003ca href=\"https:\/\/creationnetworks.net\/products\/rdl-ru-mx4lt\"\u003eRU-MX4LT\u003c\/a\u003e. Frequency response is 20 Hz to 30 kHz (±0.25 dB), and the module runs from ground-referenced 24 Vdc at 150 mA; RDL recommends the PS-24AS (USA) or \u003ca href=\"https:\/\/creationnetworks.net\/products\/rdl-ps-24ax\"\u003ePS-24AX\u003c\/a\u003e (international) power supply, not included. Mount it with the \u003ca href=\"https:\/\/creationnetworks.net\/products\/rdl-rc-1ur\"\u003eRC-1UR 1RU rack chassis\u003c\/a\u003e, \u003ca href=\"https:\/\/creationnetworks.net\/products\/rdl-ru-hra1\"\u003eRU-HRA1 10.4-inch rack mount\u003c\/a\u003e or \u003ca href=\"https:\/\/creationnetworks.net\/products\/rdl-ru-sma1\"\u003eRU-SMA1 surface mounting plate\u003c\/a\u003e.\u003c\/p\u003e\u003ch2\u003eWhat are the key features?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour line-level inputs\u003c\/strong\u003e — Each channel accepts a balanced XLR or unbalanced phono source.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMic or line balanced output\u003c\/strong\u003e — The XLR output switches between +4 dBu line and -45 dBu mic level.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpansion bussing\u003c\/strong\u003e — The unbalanced output feeds the DIRECT input of another mixer to add channels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePer-input VU meters\u003c\/strong\u003e — Dual-LED meters on each input follow standard VU ballistics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLED mix meter\u003c\/strong\u003e — An LED string meter shows the final mix level at a glance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransformer version available\u003c\/strong\u003e — The \u003ca href=\"https:\/\/creationnetworks.net\/products\/rdl-ru-mx4lt\"\u003eRU-MX4LT\u003c\/a\u003e adds a factory-installed output isolation transformer.\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\u003eHouse of worship\u003c\/li\u003e\n\u003cli\u003eAuditorium\u003c\/li\u003e\n\u003cli\u003eMulti-purpose 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\u003eBalanced line inputs (4)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e20 kΩ balanced bridging, XLR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eBalanced input level\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e-13 to +22 dBu for +4 dBu output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eUnbalanced line inputs (4)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e2 kΩ unbalanced, phono jack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eUnbalanced input level\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e-25 dBV to +20 dBV for +4 dBu output; -10 dBV nominal\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 (4)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eBalanced: off to 17 dB; unbalanced: off to 27 dB\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 attenuator\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e0 dB to infinity\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 30 kHz (±0.25 dB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eOutputs (2)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e+4 dBu 150 Ω balanced (switchable to mic level -45 dBu); -10 dBV 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\u003eOutput transformer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eNot included (see RU-MX4LT)\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 (17)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eDual-LED VU per input; power LED; LED mix level meter (0 dB = +4 dBu)\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\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eGround-referenced 24 Vdc @ 150 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eOperating environment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e32°F to 122°F (0°C to 50°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eShipping weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e1.625 lb\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\u003eCan the RU-MX4L mix microphones?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eNo. It is a line-level mixer. For microphones, use an RDL mic\/line mixer or preamplifier ahead of it.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eCan the output feed a mic input?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eYes. The balanced output is switchable to mic level (-45 dBu).\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eHow do I add more inputs?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eConnect the unbalanced LINE OUTPUT to the DIRECT input of another RU-MX4L or an RU-MX4.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eWhat is the difference between the RU-MX4L and RU-MX4LT?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eThe RU-MX4LT adds a factory-installed output isolation transformer; otherwise the two are the same.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eIs a power supply included?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eNo. It needs ground-referenced 24 Vdc at 150 mA; RDL recommends the PS-24AS (USA) or \u003ca href=\"https:\/\/creationnetworks.net\/products\/rdl-ps-24ax\"\u003ePS-24AX\u003c\/a\u003e (international) power supply, not included.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eWhat warranty applies?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eRDL's product page does not list warranty terms. Contact Creation Networks for current warranty and support details before you order.\u003c\/p\u003e\u003c\/details\u003e","brand":"RDL","offers":[{"title":"Default Title","offer_id":68025751830764,"sku":"RU-MX4L","price":408.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0603\/7982\/4364\/files\/ru-mx4l.jpg?v=1793583331","url":"https:\/\/creationnetworks.net\/products\/rdl-ru-mx4l","provider":"Creation Networks","version":"1.0","type":"link"}