Lectrosonics SM Series 100 Wireless Lav Kit

New York, New York


Audio / Sound Equipment for sale


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2 Lav Microphones, 2 Transmitters SM Transmitters, 2 Receivers URC

Key Features:
• Great for HD, DV cameras
• 256 selectable UHF frequencies over a 25.6 MHz band
• Sturdy, tempered alloy antenna
• Dual-band compandor
• Battery powered
• Machined aluminum construction
• Electrostatic powder coated & anodized finish

Included Accessories:
• (1) 9-Volt Alkaline battery
• (1) Adjustment tool (three cheers for the tiny screwdriver)
• (1) Velcro set (great feature)
• Quickstart guide (easy to follow, good layout)
• MC100XLR cable


This system offers exceedingly simple operation; it’s as plug-and-play as a wireless mic system can get. There are no extraneous nobs, controls, or jacks beyond the line out, audio level, On/Off, and the RF indicator light. Bonus: the UCR100 receiver instructions are clearly stated right on the chassis. This is beneficial if your organization, like mine, relies on interns or shares the system with another department. Basics: the frequency switch settings must match in receiver and transmitter. Set the transmitter gain first. When the gain is set properly, the -20 dB LED will always light with audio, and 0 dB will occasionally flicker. Just set it and forget it, adjusting the frequency as needed.

Wireless Performance

The UCR100 receiver offers highly sensitive operation; the matching transmitter provides 50mW of output power. The result is a really healthy operating range. After 70+ hours of recording in stationary conferences, crowded convention centers, university auditoriums, walking on campus, and in moving cars, we had no drops. We only used one receiver/transmitter, so there were no issues or the occasional interference/crosstalk that can emerge when using multiple mics. Mindful of unintentional signal blockage, I kept the transmitter antenna free/unobstructed; we always achieved maximum range and performance. It’s a rugged alloy antenna that with a really sturdy design.


This product is battery-driven, naturally, so there is no option to plug in an AC adapter if needed. Of course, it is designed for true wireless operation, so there is no surprise there. Nonetheless, keeping extra batteries on hand is always a good idea. If this basic best practice eludes you for some strange reason, no worries; the Power LED will start blinking with three hours of operation remaining. Again, this is a nifty feature if your organization is sharing the system. The battery compartment is well designed; just push the door away with your thumb, then swing the door open. No screwdriver required. Therefore, if someone is careless with the device (I’m looking at you, Stan) and happens to drop it, the battery door will not pop open accidentally.

Form Factor

The 100 Series system offers a lightweight, super compact form factor on both the LMa transmitter and the UCR100 receiver, but don’t be deceived. It’s machined-aluminum construction for rugged use; it really stands up to the occasional drop, heavy wind, and late-for-my-plane-security-belt transport. The LMa transmitter & receiver are electrostatic powder coated for superior scratch and blemish resistance.