Telex DOC02-DN9848 User Manual

Input Channels 

 

 

11 

 

Each input has an independent full-range 

compressor to improve the dynamics of the 

incoming signal levels.  The compressors are 
variable ratio and can be set to a hard knee 

characteristic for a sharp gain reduction 

response at the compression threshold, or 

soft knee for a more ‘musical’ response.   

 

On the first compressor menu page, use the centre knob to select a threshold value in the 

range –10dB to +21dB, and the right-hand knob to set a ratio from 1:1 to 5:1.   

Turn the left-hand knob clockwise to access the first sub-menu page.  Use the centre knob to 

select a hard or soft knee characteristic and the right-hand knob to set the bypass state to 

‘No’ so that the compressor is included in the signal path. 

Turn the left-hand knob clockwise to access the second sub-menu page.  Use the centre knob 

to set the compressor attack time (range of 40 s – 1ms in 20 s steps or 1ms to 100ms in 
1ms steps). Use the right-hand knob to set the release time (10ms to 2s in 10ms steps).  

 

  Set the bypass state on the second compressor page to ‘Yes’.  The other settings are held for 

future use. 

Each of the four inputs has a 9-segment signal meter for monitoring the internal signal clipping and 
compressor headroom or gain reduction.  

 

The top CLIP segment monitors the internal signal clipping.  It operates independently 
of the rest of the meter, lighting when signal clipping is detected at any stage in the 

processing circuits, regardless of whether the input level is above or below the 

compressor and/or limiter thresholds.  Hence, the audio engineer has full visibility of 
internal signal clipping that may result in audio distortion. 

 

 

The 0 to - 40 signal meter monitors the input level on a relative scale, where the 0 segment is set at 
the specified compressor threshold.   For example, if the threshold is set to +9dBu then the input 

signal meter 0 segment is set at 9dBu true value, and a signal of –3dBu registers as 12dBu below the 

threshold (below left).  Thus, when the signal level is below the threshold, the meter indicates the 
headroom. 

 

When the signal level reaches the threshold, i.e. the red 0 segment lights, the meter ‘flips’ and reads 
downwards to show the amount of gain reduction applied to the signal.