![](/images/new-backgrounds/1255922/25592213x1.webp)
EQUALIZER FUNCTIONS
Low Cut Filter (High-Pass)
The
+2
to pass from filter input to filter output without attenuation, while frequencies below the cutoff are attenuated (see Figure 6). The cutoff point is defined
0
FULL CW
as the frequency where the signal has dropped 3 dB relative to the flat, or bandpass, region. Below the cutoff point, the filter exhibits increasingly more attenuation as the frequency diminishes. The rate at which this atten- uation occurs is defined in decibels per octave (dB/oct). The SCM810 has a
| ||
| ||
| ||
FULL CCW | ||
50% | ||
| ||
ROTATION | ||
|
20 | 100 | 1,000 | 5,000 |
|
| FREQUENCY (Hz) |
|
FIGURE 6
High-Frequency Shelving
The
+10
+8
+6
+4
+2
0
2001,000 FREQUENCY (Hz)
FULL
CW
50%
ROTATE
FULL
CCW
10,000 20,000
FIGURE 7
USING AN EQUALIZER/FEEDBACK CONTROLLER WITH AN AUTOMATIC MIXER
When setting up a sound system which has an outboard equalizer or feed- back controller in the signal chain, set the SCM810 to MANUAL. This acti- vates all microphone inputs, so every possible feedback path is open. With the SCM810 in MANUAL mode, equalize the sound system and/or “Ring Out” the room to set the feedback controller.
After equalizing the sound system, set the SCM810 to AUTOMATIC mode. Remember that the input of an automatic mixer drops by 3 dB every time the number activated inputs doubles. When using an SCM810 in MANUAL mode, the master output drops by 9 dB when all 8 inputs are activated. Conversely, it will rise by 9 dB when switched back to AUTOMATIC mode.
BASIC MIXER OPERATION
1.Turn on the Power switch.
2.Adjust each channel level so that its Overload LED flickers only during very loud speech or noise.
3.Turn unused channel controls full counterclockwise.
4.Adjust the SCM810 Master level control for the required output level, as indicated by the output peak meter.
5.If a headphone monitor is to be used, adjust the PHONES control knob until the desired volume level is reached.The SCM810/E is now ready to use.
NOTE: The SCM810/E mixer is fully automatic. For most applications, no additional adjustments are required.
NOTE: The extreme sensitivity of the IntelliMix circuitry may allow some channel gating due to static discharge or electrical disturbance to the power
or signal lines. The unit will not be damaged: normal operation will resume after the disturbance ceases.
7