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DL441 OPERATORS’ MANUAL

5

CONTROL DESCRIPTION

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. 

Compressor

Threshold:

Determines the input level above which gain reduction will be

applied and may be set in the range -40 to +20dB. W hen 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.

Hard/Soft:

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.

Ratio:

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.

Gain:

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.

Summary of Contents for dl441

Page 1: ...ERATIONS page 1 INTRODUCTION page 2 INSTALLATION page 3 CONTROL DESCRIPTIONS page 5 C Compressor page 5 C Peak Limit page 6 C Stereo Link page 6 OPERATION page 7 IF A FAULT DEVELOPS page 8 CONTACTING...

Page 2: ...umber copy of the original sales invoice and a detailed description of the problem Drawmer will not accept responsibility for loss or damage during transit This warranty is void if the product has bee...

Page 3: ...INPUT VOLTAGE SWITCH IS SET TO 230 VOLTS AC AND 125mA WHERE THE MAINS INPUT VOLTAGE IS 115 VOLTS AC ALL FUSES MUST COMPLY WITH IEC 127 2 THE FUSE BODY SIZE IS 20mm x 5mm CAUTION MAINS CABLE DO NOT AT...

Page 4: ...ue stereo operation Traditionally soft knee compressors are preferable for unobtrusive level control or for the control of finished mixes whereas ratio type compressors are generally considered more s...

Page 5: ...it maybe exposed to high levels of disturbance such as found close to a TV or radio transmitter we advise that the unit is operated in a balanced configuration The screens of the signal cables should...

Page 6: ...apping screws holding the voltage selection switch cover plate on the rear panel 3 Remove the cover plate and slide the switch fully to its opposite end 4 Rotate the cover plate one half turn 180E and...

Page 7: ...ximately 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...

Page 8: ...al will not be permitted to exceed This limiter is very fast acting enabling it to control any peaks without audible distortion If the output signal is so high as to cause the limiter to operate for m...

Page 9: ...d partly by observing the gain reduction meter Normally a maximum gain reduction of between 8dB and 12dB will be adequate If more gain reduction appears necessary it is worth considering applying a co...

Page 10: ...riginal sales invoice and a detailed description of the problem Authorised returns should be prepaid and must be insured All Drawmer products are packaged in specially designed containers for protecti...

Page 11: ...er than 40dB 20Hz to 10kHz NOISE AT UNITY GAIN reference 4dBu Wideband 22Hz 22KHz CCIR ARM IEC A Q Pk CCIR AV 90dB 98dB 99dB 100dB 88dB RMS 89dB 96dB 97dB 98dB DISTORTION 100Hz 1KHz 10KHz Unity Gain 4...

Page 12: ...DL441 OPERATORS MANUAL 10 BLOCK DIAGRAM...

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