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DL441 OPERATORS' MANUAL

All four channels of the DL441 are identical and may be used completely

independently or linked for stereo operation. Separate linking switches are provided

to link channels 1 and 2 or channels 3 and 4. In the linked mode, only the left hand

channel controls are functional and serve as master controls, though the channel

bypass switches remain independent. In linked mode, the compressor/limiters and

peak limiters of the two linked channels track together to avoid the inevitable image

shifting that occurs if the two channels of a stereo signal are treated independently.

Threshold:

Hard/Soft:

Ratio:

Gain:

CONTROL DESCRIPTION

Compressor

Determines the input level above which gain reduction will be

applied and may be set in the range -40 to +20dB. When Soft

Knee compression is selected, the onset of compression is

progressive over an input range of approximately 15dB, above

which level conventional ratio compression is applied. For this

reason, the signal level may appear to fall when the compressor

is switched from Hard to Soft Knee operation and some

readjustment of the threshold setting may be required.

Selects Hard or Soft Knee operation. In general, the Soft Knee

mode provides the least obtrusive gain control and is often the

preferred setting when treating finished mixes.

Sets the final compression ratio that will be applied once the

threshold level is exceeded. The ratio may be continuously

adjusted from 1.2:1 to infinity:1 allowing the possibility of true

hard limiting.

During compression, the signal is attenuated depending on the

dynamics of the signal. As a result, gain may need to be applied

in order to produce the desired output level. The GAIN control

has a range of 20dB to +20dB. If the limiter is in operation, only

increase GAIN until the limiter operates on signal peaks. Any

further GAIN will just cause excessive limiting, thus reducing the

effect of the compressor.