Shure SCM410 manual Basic Mixer Operation, Limiter, Equalizer Functions, Low Cut Filter High-Pass

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 de- vices connected to the SCM410 output from becoming over- loaded. 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 section.

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 control proximity effect. The SCM410 has a one-pole, low-cut (high- pass) filter of 6 dB per octave. The low-cut filter allows all fre- quencies above its cutoff point to pass through unchanged. Frequencies below the cutoff are attenuated (see Figure 16). The cutoff point is defined as the frequency where the signal has dropped 3 dB relative to the flat, or bandpass, region. Be- low the cutoff point, the filter exhibits increasingly more attenu- ation as the frequency diminishes.

FREQUENCY (Hz)

LOW-CUT FILTER EFFECTS

FIGURE 16

High-Frequency Shelving

The fixed-frequency equalizer produces a 6 dB boost or cut at 5 kHz and above (see Figure 17). High-frequency shelving is extremely useful for boosting flat frequency response and tempering sibilant vocal microphones or enhancing the sound of off-axis lavalier microphones.

FREQUENCY (Hz)

HIGH-FREQUENCY SHELVING EFFECTS

FIGURE 17