{"product_id":"rdl-ru-mx4","title":"RDL RU-MX4 – 4-Channel Mic\/Line Mixer with Phantom","description":"\u003ch2\u003eWhat is the RDL RU-MX4?\u003c\/h2\u003e\u003cp\u003eThe RDL RU-MX4 is a professional 4-channel mixer that combines balanced microphones and unbalanced line sources. Each input accepts an XLR microphone or an RCA line source, with switchable 24 V phantom for each mic input. A switchable mic or line XLR output, an unbalanced line output and an integral compressor\/limiter make it a complete small-system mixer. It suits conference rooms, training rooms and houses of worship that need user-adjustable levels in a compact RACK-UP module.\u003c\/p\u003e\u003ch2\u003eHow does it work?\u003c\/h2\u003e\u003cp\u003e\u003cimg src=\"https:\/\/rdlnet.com\/wp-content\/uploads\/2024\/01\/ru-mx4.jpg\" alt=\"RDL RU-MX4 four channel microphone line mixer\" style=\"max-width:100%;height:auto\" loading=\"lazy\"\u003e\u003c\/p\u003e\u003cp\u003eEach MIC input accepts dynamic or condenser microphones, and the PHANTOM switch below each input enables phantom voltage and sets the optimum gain range. An integral high-pass filter rolls off frequencies below 80 Hz on the mic inputs. A separate unbalanced DIRECT input sums an external source into the mix, and the RCA LINE OUTPUT of one mixer can feed the DIRECT input of another to expand the channel count. The balanced XLR output switches between mic and line level and can be used at the same time as the unbalanced RCA output. Front-panel controls set each level, and each input has a dual-LED VU meter while the final mix shows on an LED string meter. A rear-panel switch inserts a soft-knee compressor\/limiter that holds an average +4 dBu output for signals up to 20 dB too hot. The RU-MX4 output is electronically balanced, and a transformer-isolated version is available as the RU-MX4T. Up to three mixers fit in one rack unit with an RDL rack adapter such as the RU-RA3R. RDL recommends the PS-24AS power supply for the USA or the \u003ca href=\"https:\/\/creationnetworks.net\/products\/rdl-ps-24ax\"\u003ePS-24AX\u003c\/a\u003e for international installations; the supply is not included.\u003c\/p\u003e\u003ch2\u003eWhat are the key features?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFour mic\/line inputs\u003c\/strong\u003e — Each channel takes an XLR microphone or an RCA line-level source.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePer-input 24 V phantom\u003c\/strong\u003e — A PHANTOM switch on each input powers condenser microphones and sets the gain range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwitchable XLR output\u003c\/strong\u003e — The balanced output switches between mic and line level.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExpandable mixing\u003c\/strong\u003e — DIRECT input and line output let several mixers chain together.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompressor\/limiter\u003c\/strong\u003e — A switchable soft-knee compressor keeps output levels under control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull metering\u003c\/strong\u003e — Per-input VU meters and an LED string mix meter simplify level setting.\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\u003eTraining room\u003c\/li\u003e\n\u003cli\u003eHouse of worship\u003c\/li\u003e\n\u003cli\u003eMulti-purpose room\u003c\/li\u003e\n\u003cli\u003eBoardroom\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:40%\"\u003e\n\u003ccol style=\"width:60%\"\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\"\u003eRU-MX4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eMicrophone Inputs (4)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e2 kΩ balanced, switchable 24 V phantom (IEC 61938: 2013)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eMic Input Level for +4 dBu output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e-58 to −20 dBu (PHANTOM OFF or ONHI gain); -41 to −4 dBu (PHANTOM ON LO gain)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eLine Inputs (4)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e2 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\u003eLine 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 (5)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eMic: Off to 62 dB gain (PHANTOM OFF); Off to 62 dB gain (PHANTOM ON HI GAIN; Off to 46 dB gain (PHANTOM ON LO GAIN); Line: Off to 27 dB gain\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 – Mic\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e80 Hz to 30 kHz (+\/- 1.5 dB), \u0026lt;-10 dB @ 20 Hz (integral high-pass filter)\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 – Line\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\u003eTHD+N – Mic\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e\u0026lt; 0.1% (80 Hz to 20 kHz)\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 – Line\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e\u0026lt; 0.02%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eResidual Noise (below +4dBu output)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e4 line level sources (unity gain): \u0026lt; -82 dB (wideband)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003e40dB Gain, LO GAIN\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eMic: -79 dB; all 4 mic level sources: \u0026lt; -73 dB (wideband); \u0026lt; -76 dB (“A” weighted)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003e50dB Gain, HI GAIN\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eMic: -79 dB; all 4 mic level sources: \u0026lt; -73 dB (wideband); \u0026lt; -76 dB (“A” weighted)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003e60dB Gain, HI GAIN\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eMic: -70 dB; all 4 mic level sources: \u0026lt; -64 dB (wideband); \u0026lt; -66 dB (“A” weighted)\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 MIC or LINE); -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\u003eIndicators (18)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eDual-LED VU meter for each input; COMPRESSION\/LIMITING active LED; POWER LED; 8-segment bar mode string LED audio mix level meter, 0 dB = +4 dBu; VU ballistic: -20 dB, -10 dB, -6 dB, -2 dB, 0 dB, +3 dB; Peak reading: +8 dB,+12 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\u003ePower Requirement\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e24 Vdc @ 150 mA, Ground-referenced\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px;vertical-align:top\"\u003e\u003cstrong\u003eOverall Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eHeight: 1.7 in. 4.3 cm; Length: 5.8 in. 15.0 cm\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 several RU-MX4 mixers be combined?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eYes. The unbalanced LINE OUTPUT of one mixer can feed the DIRECT input of another to expand mixing capacity.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eDoes it provide phantom power?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eYes. 24 V phantom (IEC 61938: 2013) is switchable on each microphone input.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eWhat does the compressor do?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eWhen switched in, the soft-knee compressor\/limiter begins acting about 6 dB below normal output and maintains an average +4 dBu output for signals up to 20 dB too hot.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eWhat power does it need?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003e24 Vdc at 150 mA, ground-referenced. RDL recommends the PS-24AS power supply for the USA or the \u003ca href=\"https:\/\/creationnetworks.net\/products\/rdl-ps-24ax\"\u003ePS-24AX\u003c\/a\u003e for international installations; the supply is not included.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eHow is it mounted?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eRDL lists RACK-UP mounting accessories including the RU-RA3R, \u003ca href=\"https:\/\/creationnetworks.net\/products\/rdl-ru-hra1\"\u003eRU-HRA1\u003c\/a\u003e, \u003ca href=\"https:\/\/creationnetworks.net\/products\/rdl-ru-sma1\"\u003eRU-SMA1\u003c\/a\u003e, \u003ca href=\"https:\/\/creationnetworks.net\/products\/rdl-ru-br1\"\u003eRU-BR1\u003c\/a\u003e, \u003ca href=\"https:\/\/creationnetworks.net\/products\/rdl-rc-1ur\"\u003eRC-1UR\u003c\/a\u003e, UC-1R, UC-2R and WDG1R, plus the \u003ca href=\"https:\/\/creationnetworks.net\/products\/rdl-dra-35r\"\u003eDRA-35R\u003c\/a\u003e DIN rail adapter.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eWhat warranty does the RU-MX4 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 integrate the RU-MX4?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eYes. Creation Networks supports system design, equipment selection and installation planning for RDL products nationwide. Call (888) 230-3661 for a quote or technical help.\u003c\/p\u003e\u003c\/details\u003e","brand":"RDL","offers":[{"title":"Default Title","offer_id":68025751797996,"sku":"RU-MX4","price":474.66,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0603\/7982\/4364\/files\/ru-mx4.jpg?v=1793583331","url":"https:\/\/creationnetworks.net\/products\/rdl-ru-mx4","provider":"Creation Networks","version":"1.0","type":"link"}