Shure AMS8100 Betriebsanweisung PDF herunterladen (Seite 8)

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.

NOTE: The sensitivity of the

Intellimix

circuitry may allow some channel gating due to static discharge or electrical distur-

bance to the power or signal lines. The unit will not be damaged; normal operation will resume after the disturbance ceases.

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.

-10

-8

-6

-4

-2

20 100 1,000

5,000

FREQUENCY (Hz)

FULL CCW

FULL CW

50%

ROTATION

AMPLITUDE

(dB)

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.

200

-10

-8

-6

-4

-2

+10

1,000 10,000

20,000

FREQUENCY (Hz)

FULL

CCW

50%

ROTATE

AMPLITUDE

(dB)

HIGH-FREQUENCY SHELVING EFFECTS

FIGURE 17

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 17 18

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