Sonifex RB-ML2 Stereo Microphone & Line Level Limiter

Sonifex RB-ML2 Stereo Microphone & Line Level Limiter

The RB-ML2 is a line level limiter and stereo microphone. The major uses for the unit are in situations where distortion prevention, mixer input protection, and assistance with level control are needed. Perfect for news booths and PC workstation input, it offers a cost-effective level control option. The RB-ML2 features two electronically balanced XLR-3 inputs that are connected to a rear push-button-controlled line amplifier, also known as a microphone amplifier. The microphone amplifiers feature DIP switches for a high pass filter (low frequency roll-off at 125Hz), phantom power to supply +48V to the connected microphones, and independent pre-set gain controls.

The outputs of these amplifiers are passed through a VCA limiter circuit that can operate jointly on the signals in stereo mode, or independently in dual mono mode. The rear panel mode switch changes the unit from dual mono to stereo. Stereo limiting operates by limiting both left and right outputs if either left or right input needs to be limited. Dual mono limiting operates by limiting left and right signals individually, so you can use the RB-ML2 as two separate mono mic/line limiters. The characteristics of the limiter can be set via level threshold pre-sets. For each channel there is an input gain and a threshold level control. With the limit threshold set to maximum, the input through to output can be normalised using the input potentiometers. Once the unit is acting as a buffer with gain/attenuation, the limit threshold level can be set, with the recovery adjusted for the application. The power LED indicates limiting by flashing. The two XLR-3 electronically balanced outputs can be set to either line or mic output levels via a push-button. This allows the RB-ML2 to be used in line with a line or mic input on a mixer, or similar equipment.