The Rolls MX422 is a four channel, microphone/line mixer with balanced XLR inputs and outputs. The unit is ideal for the broadcast and video markets. It has the same features of other ENG / portable mixers without the extremely high price. Applications include:
* DV Field Production.
* Electronic News Gathering.
* Location Recording (Dialogue and Music).
* Digital Recording.
* Broadcast Remotes.
* Desktop Mixing for Video Post Production.
The Pan control routes an input channel signal anywhere between the Left and Right outputs. The MX422 uses constant loudness pan controls, meaning that the signal is 3 dB louder at the full right or full left position relative to the center position. Usually, the channel is either panned full left, full right, or center. The pan potentiometer has a detent in the center position for easy location, and it is calibrated for a maximum diff erence of +/- 0.1 dB between the left and right output in
The MX422 Limiter acts as a "safety" limiter. During normal operation, with a properly set gain structure, the threshold of the limiter will not be reached. If extremely high input signal levels exist, such as in high SPL environments or with misadjusted settings, the limiter will activate to prevent the channel from clipping. Without a limiter, high signal conditions would overload the channel and cause distortion. Adjust the LIMITER THRESH control to a point above your normal operating levels, but safely below levels causing distortion or "pegging" of the VU meters.
The MX422 features two calibrated, backlit VU meters. VU (Volume Units) meter ballistics correspond closely to how the human ear perceives loudness and provides a good visual indication of how loud a signal will be. The attack and decay of the meter signal is 300 mS. The indicated level on the meters is referenced to +4 dB.
SLATE TONE AND MICROPHONE
The Slate Tone and Microphone circuit is used to notate scenes at the mixer location. The Slate circuit uses the front panel momentary button. When this button is pressed, a 20Hz tone is sent to the Main Outputs, and the Slate Microphone becomes active. When notating a scene - press and hold the Slate button, speak into the four-holed
Slate microphone, and release.
This oscillator is provided to set the gain structure between the MX422 and the next device in your signal chain. The Tone oscillator is set to output a 1 kHz sine wave to the Main Right and Left outputs (with the Output Level switch set in the out or LINE position). Note this tone is also sent to the Headphone outputs when the Headphone SOURCE button is in the MAIN position. It would be a good idea to remove your headphones or earphones when the Tone button is pressed in. When levels are set, press the Tone button again to disengage the Tone oscillator.