Basic Mixer Operation; Equalizer Functions - Shure SCM410 Manual

Basic Mixer Operation

1. Adjust each channel level so that its Overload LED flickers only during very loud speech or noise.
2. Adjust the Low-Cut and High-Frequency controls adjacent to each Input Gain control so that the microphones
sound similar.
3. Adjust the Master level control for the required output level, as indicated by the output peak meter. The
SCM410 is now ready for use.
Limiter
Output limiters prevent distortion during loud program peaks without affecting normal program levels. This keeps
the devices connected to the SCM410 output from becoming overloaded. Increasing individual or Master controls
on the SCM410 increases average output and, in turn, the amount of limiting.
The limiter may be turned on via the rear panel DIP switch. The default limiter threshold is +16 dBu. As supplied,
the limiter is defeated.
Note: Limiter thresholds can be changed from their factory settings. Refer to the Internal Modifications Addendum.

Equalizer Functions

Low Cut Filter (High-Pass)
Low-cut filters are used to reduce unwanted low frequency sounds such as footsteps, motorized traffic, and to con-
trol proximity effect. The SCM410 has a one-pole, low-cut (high-pass) filter of 6 dB per octave. The low-cut filter al-
lows all frequencies above its cutoff point to pass through unchanged. Frequencies below the cutoff are attenuated
(see Figure 2). The cutoff point is defined 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 di-
minishes.
FIGURE 2: LOW-CUT FILTER EFFECTS
High-Frequency Shelving
The fixed-frequency equalizer produces a 6 dB boost or cut at 5 kHz and above (see Figure 3). High-frequency
shelving is extremely useful for boosting flat frequency response and tempering sibilant vocal microphones or en-
hancing the sound of off-axis lavalier microphones.
Shure Incorporated
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