The Lectrosonics SR wireless microphone systems includes the SR dual channel, drop in wireless receiver and two UM400a wireless transmitters. The appropriate connector kit for your camera is included with the rental.

Lectrosonics SR Wireless Receiver Features

The Lectrosonics SR receiver offers two independent channels and fits into the standard video camera slots found on professional cameras. The two audio channels can feed separate inputs or can be mixed internally to feed a single input. Frequency response is 30 Hz to 20.

Two diversity modes are offered in the Lectrosonics SR. SmartDiversity reception is employed by independently combining antenna phase for each receiver channel. Alternately, the two channels can be used together in “True Diversity” Ratio mode as a single receiver. Graphic spectrum scanning provides quick and easy location of clear operating frequencies for interference-free operation.

The two Digital Hybrid Wireless receivers inside the Lectrosonics SR offer 256 frequencies each in one of nine available blocks, and operate with any of the Lectrosonics 400 Series transmitters without a compandor in the audio path. In addition, compatibility modes also facilitate operation with Lectrosonics 100 Series, 200 Series, and IFB analog systems, along with analog transmitters from two other manufacturers. Transmitter battery strength is monitored in the Lectrosonics SR when using compatibility modes for 200 and 400 Series transmitters.

While mounted on a camera, the SR is splash resistant—thanks to sealed membrane switches and LCD, along with a special gasket covering the slot opening. The SR can be used with slot-equipped Sony, Ikegami, or Panasonic professional cameras via optional connector kits. A stand-alone kit is also available that enables using the SR out of the camera slot, powered from external DC, and provides two locking mini-XLR analog audio outputs.

Receiver audio frequency response is 30 Hz to 20 kHz, ±1 dB, while overall system response is determined by the transmitter and microphone element used. Signal to noise performance at the receiver output is 107 dB before limiting.

Lectrosonics UM400a Wireless Transmitter Features

The ​Lectrosonics UM400A, the most recent version of Lectrosonics’ most popular transmitter (the UM400), features the current-servo input circuit originally developed for the Lectrosonics  SM Series. The input enables a wider range of microphone sensitivities and provides a straightforward microphone wiring method. The new servo input on the ​Lectrosonics UM400a has much more gain for low impedance signals, allowing better performance for dynamic mics.