{"product_id":"rdl-ru-mld4","title":"RDL RU-MLD4 – 1x4 Mic\/Line Audio Distribution Amplifier","description":"\u003ch2\u003eWhat is the RDL RU-MLD4?\u003c\/h2\u003e\u003cp\u003eThe RDL RU-MLD4 is a one-input, four-output audio distribution amplifier that splits a microphone or line source to four isolated destinations. Front-panel XLR jacks and rear detachable terminal blocks are active at the same time, which suits both patching and permanent wiring. Switch-selectable mic gain, 24 Vdc phantom power and per-output mic or line levels let one module handle dynamic and condenser microphones as well as line sources.\u003c\/p\u003e\u003ch2\u003eHow does it work?\u003c\/h2\u003e\u003cp\u003e\u003cimg src=\"https:\/\/rdlnet.com\/wp-content\/uploads\/2024\/01\/ru-mld4.jpg\" alt=\"RDL RU-MLD4 1x4 Mic\/Line Audio Distribution Amplifier\" style=\"max-width:100%;height:auto\" loading=\"lazy\"\u003e\u003c\/p\u003e\u003cp\u003eThe input has a rear-panel switch for MIC or LINE, plus switches for LO or HI mic gain and for 24 Vdc phantom power. The two mic gain ranges cover a wide variety of dynamic and condenser microphones, from -65 dBu to -3 dBu input for +4 dBu output. Each of the four outputs has its own rear-panel switch to set mic or line level, and the outputs are isolated from each other and can be wired balanced or unbalanced. This lets one microphone feed a mixer, a recorder, a broadcast feed and an assistive listening system at the same time. A front-panel gain trim with a dual-LED VU meter, calibrated to +4 dBu for line-level outputs, sets the operating level. Line frequency response runs 15 Hz to 50 kHz (±0.1 dB) with more than 20 dB of headroom above +4 dBu. A version with studio-quality output transformers is available as the RU-MLD4T. Power is ground-referenced 24 Vdc at 90 mA through a rear terminal block or power jack; 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 isolated outputs\u003c\/strong\u003e — One mic or line source feeds four destinations that are isolated from each other.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMic or line input\u003c\/strong\u003e — A rear switch selects mic or line level, with LO and HI mic gain ranges.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwitchable 24 V phantom\u003c\/strong\u003e — Phantom power per IEC 61938:2013 supports condenser microphones.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMic or line outputs\u003c\/strong\u003e — Each output is switch-selectable to mic or line level.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFront XLR and rear terminal blocks\u003c\/strong\u003e — Both connection sets are active at all times for patching or fixed wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGain trim with VU metering\u003c\/strong\u003e — Front-panel trim and dual-LED meters set proper levels quickly.\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\u003eBroadcast studio\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\u003eInputs (1)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eXLR (front); detachable terminal block (rear)\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 out)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e-48 dBu to -3 dBu (LO gain); -65 dBu to -20 dBu (HI 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 input level (for +4 dBu out)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e-15 dBu to +28 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\u003eInput impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eMic: 2 kΩ balanced, switchable 24 V phantom (IEC 61938:2013); Line: \u0026gt; 10 kΩ balanced\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 (4)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eXLR (front); detachable terminal block (rear); mic or line selectable\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 impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e150 Ω balanced\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 trim\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eMic: off to 52 dB (LO) \/ off to 69 dB (HI); Line: off to 20 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\u003eFrequency response\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eMic: 80 Hz to 50 kHz (±0.75 dB); Line: 15 Hz to 50 kHz (±0.1 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\u003eCMRR\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e\u0026gt; 60 dB (mic); \u0026gt; 50 dB (line)\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\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eMic: -79 dB (50 dB gain), -70 dB (60 dB gain); Line: -85 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\u003eHeadroom\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003e\u0026gt; 20 dB above +4 dBu line 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\u003ePower requirement\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"border:1px solid #ddd;padding:6px\"\u003eGround-referenced 24 Vdc @ 90 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 131°F (0°C to 55°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\"\u003e1.48 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\u003eDoes it provide phantom power?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eYes. Standard 24 Vdc phantom power (IEC 61938:2013) is switch-selectable on the mic input.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eCan the outputs feed mic-level inputs?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eYes. Each output is switch-selectable to mic or line level.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eCan I use the front XLR and rear terminals at the same time?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eYes. Both the front-panel XLR connectors and the rear terminal blocks are active at all times.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003e\u003cstrong\u003eIs there a transformer-isolated version?\u003c\/strong\u003e\u003c\/summary\u003e\u003cp\u003eYes. The RU-MLD4T adds a studio-quality audio output transformer on each output.\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; 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\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","brand":"RDL","offers":[{"title":"Default Title","offer_id":68025745834220,"sku":"RU-MLD4","price":385.87,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0603\/7982\/4364\/files\/ru-mld4.jpg?v=1793583135","url":"https:\/\/creationnetworks.net\/products\/rdl-ru-mld4","provider":"Creation Networks","version":"1.0","type":"link"}