background image

DL241 OPERATORS’ MANUAL

7

Output
Level Meter:

This is an 8 segment LED bargraph level meter that monitors the

level  of  the  output  signal  over  the  range  -20dB  to  +15dB  with
reference to the selected (-10dBu or +4dBu) operating level.

Bypass:

 

This  switch  causes  a  'hard-wire'  bypass  function  of  all signal
processing  for  this  channel,  where  the  input  socket  is  routed
directly to the output socket. This feature enables the unit to pass
audio  even  with  no  power  applied  to  the  DL241.  Normally  the
switch is used to compare the raw unprocessed signal verses with
any expansion, compression and limiting of the audio input.

PEAK LIMITER

Level:

Sets an absolute limit to the level that the output signal 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 more than 20mS, the
system gain is automatically reduced to bring the signal back within
range. The system gain is then returned to normal over a period of
approximately one second. The compressor Gain control should be
used to ensure that the peak limiter operates only rarely if at all, if
it is to be used purely for peak protection. Alternatively, it may be
deliberately driven into limiting to produce creative effects.

LINKING

Stereo Link:

Depressing this switch configures the unit in stereo mode where

the  left  hand  channel  controls  act  as  masters  for  both  audio
channels. The same degree of gain reduction is applied to both
audio channels to prevent image shifting which would otherwise
occur whenever the left and right signal dynamics varied from each
other by any significant degree.

Summary of Contents for DL241

Page 1: ...NUAL CONTENTS SAFETY CONSIDERATIONS page 1 INTRODUCTION page 2 INSTALLATION page 3 CONTROL DESCRIPTIONS page 5 OPERATION page 8 IF A FAULT DEVELOPS page 10 CONTACTING DRAWMER page 10 TECHNICAL SPECIFI...

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 63mA 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 ATTE...

Page 4: ...used The accepted way of dealing with this problem is to include in the compressor a separate expander section with its own threshold control so that a low level gating action may be applied to keep p...

Page 5: ...compatible with mono jacks The mono jack actually shorts the cold terminal to ground For the DL241 units fitted with XLR connectors unbalanced operation is achieved by shorting pin 3 of the XLR conne...

Page 6: ...voltage which is different to that as supplied the following procedure must be carried out see following diagram 1 Disconnect the unit from the mains 2 Using a number 1 size pozidrive screwdriver remo...

Page 7: ...ote because the expansion ratio varies with signal level it is possible to arrive at a situation where the red expansion LED may be illuminated when little or no perceived gain reduction is taking pla...

Page 8: ...he rate at which the compressor will respond to input signals that exceed the threshold level This may be set in the range 0 5mS to 100mS Release Sets the rate at which the system gain returns to norm...

Page 9: ...y 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 more than 20mS the system gain is automatically reduced...

Page 10: ...ly by observing the gain reduction meter In general a maximum gain reduction of between 8dB and 12dB will be adequate If more gain reduction appears necessary consider applying a conservative degree o...

Page 11: ...mme dynamics it should be possible to obtain far more satisfactory results than are possible with conventional expanders By the same token do not assume that because the expander threshold LED flicker...

Page 12: ...original 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 protect...

Page 13: ...th Expander Off Wideband 22Hz 22KHz CCIR ARM IEC A Q Pk CCIR AV 90dB 95dB 95dB 97dB 84dB RMS 88dB 93dB 93dB 95dB 82dB DISTORTION 100Hz 1KHz 10KHz Unity Gain 4dBu input 0 03 0 02 0 03 14dBu input 10dB...

Page 14: ...DL241 OPERATORS MANUAL 12 BLOCK DIAGRAM...

Reviews: