RDL RU-SM16 Dual Audio Meter - Average/Peak/Hold

MSRP: $438.15
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The RU‑SM16 is the ideal choice in most applications where audio level metering is to be designed into a system, or added to existing equipment. The RU‑SM16 has two separate line‑level inputs. Each input permits the connection of either balanced or unbalanced, high or low impedance audio lines. All connections are made using full‑size barrier block terminals.

Jumpers on the rear panel allow the installer to set each meter individually for either peak or average audio level display. In stereo applications, either peak or average is typically selected. In monaural installations, it may be advantageous to feed the mono source to both meters, setting one for peak and the other for average. In either mode the upper three LEDs (+10, +14, +18) remain in the PEAK HOLD mode.

The RU‑SM16 uses large LEDs for good visibility. Each channel input has a write‑on label area for identification of the source or function being metered.


  • Precision Audio Level Metering
  • Digital String Display Indication
  • Precise Left/Right Meter Tracking
  • Individual Channel Calibration Controls
  • Selectable Peak or Average Metering
  • Visual Verification of Adequate Headroom


Inputs (2):
Line level

Input Impedance:
200 kΩ balanced or unbalanced

Input Range (sensitivity) :

‑26 dBu to +14 dBu (for 0 dB reading)

Metering Freq. Response:
20 Hz to 50 kHz

16 LEDs per channel; ‑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 (barrier block strap provided)

Peak Mode Average Mode

Rise Time (10% ‑us 90%)
50 us 130 ms

Rise Time (0% ‑ 100%)
60 us 300 ms*

Fall Time (90% ‑ 10%)
65 ms 185 ms

Fall Time (100% ‑ 0%)
100 ms us 300 ms*

Power Requirement:
GROUND‑REFERENCED, 24 to 33 Vdc @ 250 mA

Ambient Operating Environment:
0° C to 55° C
RDL Three-Year Limited Warranty Installation of these products by the Purchaser shall constitute Purchaser’s acknowledgement and acceptance of the terms and conditions for sale and of this warranty, and shall constitute the Purchaser’s determination of the suitability of this product for the Purchaser’s intended application. Radio Design Labs, Inc., also referred to as RDL®, warrants to the Purchaser that products manufactured by RDL are free from defects in material and workmanship. This warranty applies to the period of three years from the date of shipment, except for component parts or products purchased from other sources and supplied by RDL. Such component parts or products bear only the warranty of the manufacturer thereof in effect at the time of shipment to the Purchaser. RDL will, without charge, and after written notice has been received and acknowledged by RDL, repair an RDL product if proved to be defective according to the usage of the trade, when such equipment is received by RDL at the location it designates with shipment costs prepaid by the Purchaser. RDL shall not be liable for any expense whether for repairs, replacements, material, service, or otherwise, incurred by the Purchaser or modifications made by the Purchaser to the product. No equipment shall be deemed defective if it shall fail to operate in a normal or proper manner due to exposure to excessive moisture in the atmosphere, excessive temperature extremes, improper environmental cleanliness, or any other environment not consistent with the principles of good engineering practice. In no event shall RDL have any liability for consequential damage or expense directly or indirectly arising from the use of the products, or any inability to use it either separately or in combination with other equipment or materials, or from any other cause, whether used in accordance with instructions or not. This warranty is void if equipment is altered in any way by other than RDL. RDL products are NOT intended for use in life support appliances, devices, or systems. Use of RDL products in such applications is done solely at the liability of the reseller/installer and/or end user. RDL reserves the right to change design parameters and specifications at any time without notice. The performance measurements reflect the products at the time of printing. This warranty is in lieu of all others, either expressed or implied. No representative is authorized to assume for RDL any other liability in connection with RDL products.