RDL RU-SM16A – 2-Channel LED Audio Level Meter

What is the RDL RU-SM16A?The RDL RU-SM16A is a two-channel audio level meter with 16-LED displays for precise metering in stereo or as two independent mono meters. Each input can be calibrated for consumer, professional, 8 ohm speaker or 25 V, 70 V and 100 V constant-voltage lines. Peak or average metering is selectable per channel, and the top three LEDs act as peak-hold indicators.How does it work?The RU-SM16A has two separate inputs on detachable terminal blocks, each with input impedance above 40 kΩ. Each input can be calibrated for unbalanced consumer, balanced professional, 8 ohm speaker or constant-voltage speaker lines. A rear-panel switch selects fixed calibration at +4 dBu, 25 V, 70 V or 100 V, or variable calibration set with front-panel multi-turn trimmers. Rear-panel switches set each meter for peak or average display. In mono systems, feeding one source to both meters with one set to peak and one to average shows both responses at once. The +10, +14 and +18 LEDs always operate in PEAK HOLD mode. Each channel has a label area to identify the source being metered. The module runs on 24 Vdc at 250 mA; RDL recommends the PS-24AS (USA) or PS-24AX (international), and it rack mounts with the RDL RU-HRA1.What are the key features? 16-LED displays — Precise level indication from SIG to +18. Stereo or dual mono — Two independent meters or one stereo meter. Wide input compatibility — Line level, 8 ohm speaker or 25/70/100 V lines. Fixed or variable calibration — Preset levels or front-panel multi-turn trimmers. Peak or average — Selectable ballistics for each channel. Peak hold — +10, +14 and +18 LEDs hold peaks. Where is it typically used? Broadcast studio Auditorium House of worship Training room Technical Specifications Model RU-SM16A Inputs (2) Line level or Amplified speaker level Input Impedance > 40 kΩ balanced or unbalanced 0 dB Calibration Fixed or Variable (switch-selectable) Fixed Input Level +4 dBu (+4 switch settings, for 0 dB reading) 25 V* (25 V switch settings, for 0 dB reading) 70 V* (70 V switch settings, for 0 dB reading) 100 V* (100 V switch settings, for 0 dB reading) Variable Input Level Range -24 dBu to +12 dBu (+4 switch settings, for 0 dB reading) 2 V to 90 V* (25 V switch settings, for 0 dB reading) 4 V to 90 V* (70 V switch settings, for 0 dB reading) 5 V to 100 V* (100 V switch settings, for 0 dB reading) *Constant-voltage or low-impedance (4 Ohms, 8 Ohms) amplifier output Metering Freq. Response 20 Hz to 20 kHz Indicators SIG, -20, -15, -12, -9, -6, -3, -2, -1, 0, +1.5, +3, +6, +10, +14, +18 (+10, +14, +18 are PEAK HOLD indicators only) Metering Response Each channel individually selectable PEAK or AVG (switch-selectable) Ambient Operating Environment 32° F to 131° F (0° C to 55° C) Power Requirement GROUND-REFERENCED, 24 Vdc @ 250 mA Frequently Asked QuestionsWhat signals can it meter?Line-level audio, 8 ohm speaker lines, and 25 V, 70 V or 100 V constant-voltage speaker lines.Can each channel use a different mode?Yes. Each channel can be set individually for peak or average metering.How is it calibrated?Use fixed calibration at +4 dBu, 25 V, 70 V or 100 V, or variable calibration with front-panel trimmers.How is it powered?24 Vdc at 250 mA, ground-referenced. RDL recommends the PS-24AS (USA) or PS-24AX (international).How is it connected?All connections use detachable terminal blocks.What warranty does it carry?This 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.Can Creation Networks help design the system?Yes. Our team specifies, programs and installs audio monitoring systems for commercial projects nationwide. Call (888) 230-3661 for a quote or design review.