Dbx 1046 Manuel d'utilisateur télécharger pdf (Page 6)

the compressed region. This smooth transition greatly reduces compression artifacts and allows higher

compression ratios while still maintaining the natural characteristics of the signal. The switch lights to

indicate OverEasy® processing is enabled. When conventional hard knee processing is desired, disable

the OverEasy® function. See Figure 1 below.

Figure 1: Hard Knee Compression Curve and OverEasy® Compression Curve.

Compressor Ratio Control - This control selects the ratio between input and the output levels for

signals above the level set by the COMPRESSION THRESHOLD control. It is adjustable between 1:1

and ∞:1. Note, when OverEasy® processing is selected, the ratio transitions smoothly from the linear to

the compressed region. As the signal exceeds the threshold, the ratio approaches the ratio set by the

COMPRESSOR RATIO control.

Figure 2 shows the effect of 2:1 compression on a signal as it rises above and falls below the threshold.

Below the threshold the signal is not affected. Above the threshold, the output signal increases by only

half of the increase (in dB) of the input signal level. In other words, with a 2 dB increase in input level,

the output increases by only 1 dB, hence the 2:1 compression ratio.

Figure 2: Compression Effect on Signal Level with a 2:1 Ratio at a -20 dBu Threshold

Input/Output Level Meter - This 8-stage meter directly reads the input and output levels when the rear-

panel OPERATING LEVEL SWITCH is in the +4 dBu position. In the -10 dBV position, the input signal

is boosted by 11.8 dB (the difference between +4 dBu and -10 dBV) to convert a semi-pro -10 dBV level

signal to the professional +4 dBu internal level of the 1046, while the output signal is attenuated by 11.8

dB to convert back to a -10 dBV level. Since the meter is calibrated for +4 dBu operation, it reads about

12 dB higher than the actual input and output signal levels when the OPERATING LEVEL SWITCH is

set to -10 dBV.

Input/Output Meter Switch - This switch selects the signal for metering by the INPUT/OUTPUT LEVEL

-40

-30

-20

-10

Time

Signal Level (dBu)

Below Threshold

Above Threshold

Input Signal

Output Signal

-40

-30

-20

-10

Time

Signal Level (dBu)

Below Threshold

Above Threshold

Input Signal

Operating controls

1:1

2:1

4:1

−

+15

+20

+10

INPUT LEVEL (dB)

OUTPUT LEVEL (dB)

−

+15

+20

+10

RED

Below Threshold

Above Threshold

OverEasy Range

-15

-10

-5

+15

+20

+10

INPUT LEVEL (dB)

OUTPUT LEVEL (dB)

-15

-10

-5

+5 +15

+20

+10

1:1 Unity

2:1

4:1

20:1

RED

Above Threshold

GREEN

Below Threshold

Rotation Point Threshold

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Dbx 1046 Manuel d'utilisateur Page 6

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