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band. The centre frequency is at 12kHz.  
  

EQ On.  

  
The  ‘EQ  On’  switch  allows  the  EQ  section  to  be  bypassed  for  comparison  of  the 
equalised and original, unprocessed signal.   
  

EQ Pre.  

  
The ‘EQ Pre’ switch places the equaliser ahead of the compressor section in the signal 
path. This enables more flexibility in sound, since the compressor will become more 
sensitive to any frequencies that have been boosted by the EQ section. The effect may 
be compared by toggling the EQ Pre switch.  
 

EQ Side Chain 

 

The ‘EQ s/c’ button allows you to use the EQ section in the sidechain for de-essing or 
frequency variable compressor effects. 
 

Sidechain Operation  

 
De-essing  (the  process  of  reducing  the  level  of  sibilant  sounds  in  a  vocal)  can  be 
described  as  frequency  dependent  compression.  The  Ebony  A2  can  send  the  input 
signal through its EQ unit section via its internal sidechain return; the compressor on 
the  A2  can  then  be  triggered  by  specific  frequencies  in  the  signal.  For  vocals,  this 
range is between around 2-8 kHz. The EQ section is used to exaggerate the offending 
frequencies so that when they occur the compression is triggered.  It’s also useful for 
cutting frequencies that you don’t want to compress. 
 

Output Gain.  

  
This controls the level at the Ebony A2output. The nominal level is 0dB at the centre 
detented position. This control effectively acts like an output fader, and is very useful 
when recording direct to tape or hard disc through the Ebony A2. You may find that 
some  digital  recorders  require  a  good  deal  of  input  level  in  order  to  register  a  0dB 
reading  on  their  meters  (+18dBu  analogue  usually  matches  0dBFS  in  the  digital 
domain).  This  is  normal,  since  many  digital  recorders  are  designed  to  preserve 
headroom  and  keep  the  signal  well  below  the  0dB  clip  point  -  thus  preventing  the 
recorder distorting. The Ebony A2 provides a further 15dB of gain at the output fader 
to  drive  digital  recorders.  It  is  important  to  distinguish  the  difference  between  the 
output  gain  knob  and  the  gain  make-up  knob  in  the  compressor  section.  The  gain 
make-up  control  is  only  active  when  the  compressor  is  switched  on,  whereas  the 
output  gain  control  is  always  active  but  will  have  no  effect  on  the  compression 

Содержание Ebony A2

Страница 1: ...T L Audio User Manual Ebony Series A2 Stereo Processor TL Audio Limited Letchworth England Tel 01462 492090 Fax 01462 492097 www tlaudio co uk email info tlaudio co uk...

Страница 2: ...Overview of Compressor Operation 10 Threshold 10 Attack and Release 11 Gain Make Up 11 Compressor On 12 Equalisation 12 LF Band 12 Mid Band 12 HF Band 12 EQ On 13 EQ Pre 13 EQ Side Chain 13 Sidechain...

Страница 3: ...fers superior analogue processing to accompany a digital world Why Class A Class A circuits are designed with a constant current flowing through all of the transistors which is sufficient to drive the...

Страница 4: ...an audio system A balanced signal consists of signal phase and non phase connections which form a differential pair independent of the ground or earth connection Noise particularly mains hum and high...

Страница 5: ...A and B channels are compressed identically in order to preserve the stereo image The Equaliser has 3 bands The HF and LF controls are shelving whilst the mid control is a swept peaking filter The equ...

Страница 6: ...rved All mains wiring should be installed and checked by a qualified electrician Ensure the mains operating voltage stated on the rear panel is correct before connecting to the mains supply Never oper...

Страница 7: ...6 BLOCK DIAGRAM...

Страница 8: ...e taken to an approved service centre Alternate supply voltages may also require a different power cable or mains plug If in doubt consult local electrical regulations Warning attempted operation on t...

Страница 9: ...If an unbalanced output is required pins 1 and 3 should both be connected to ground Ventilation The unit generates a moderate amount of heat internally which should be allowed to dissipate by convect...

Страница 10: ...loading distortion problems as well as raising the level of the quieter parts of the audio signal Before the introduction of compressors the only way this could be achieved was by gain riding whereby...

Страница 11: ...se position Any signal below the Threshold passes through the unit unaffected while signals above the Threshold are reduced in gain and are thus compressed This does depend on the Soft or Hard knee to...

Страница 12: ...eavy signals the compressor is forced in and out of compression during one cycle of the waveform and distortion results The Ebony A2 has a built in Hold facility which delays the onset of release for...

Страница 13: ...gain available from the EQ section and greatly boosting one or more bands can cause the red Peak LED to illuminate as the Ebony A2 is driven towards clipping In this case you need to compensate by bri...

Страница 14: ...Hz The EQ section is used to exaggerate the offending frequencies so that when they occur the compression is triggered It s also useful for cutting frequencies that you don t want to compress Output G...

Страница 15: ...eful for slaving the Ebony A2 A D card to an existing digital setup without the Ebony A2 needing to be the digital master in the system Output Peak LED Each channel has an output Peak LED adjacent to...

Страница 16: ...s to the channel tape return inputs of your console then connecting one channel of the A2 into the relevant console channel insert point The off tape signal will then be fed into the A2 s line input v...

Страница 17: ...to set up the gains of the A2 With the compressor and EQ stages switched out start with the A2 input gain at minimum and output gains at 0dB 2 Gradually bring up the A2 input gain until the chosen sou...

Страница 18: ...doubt aim to use compression gently as it can be difficult to compensate for over compression if you later decide that too much effect was used On the other hand there are no rules so if extreme sett...

Страница 19: ...025 10Hz to 40KHz Noise 94dBu 22Hz to 22KHz 0dB gain at input and output Outputs Gain Range 20dB Maximum Level 22dBu 2Kohm load 26dBu 10Kohm load Tube Stage Typical Distortion 1 to 10 depending on Dri...

Страница 20: ...ut VU Meter Switchable to Channel A or B Input or Ouput and Gain Reduction Nominal calibration 0VU 4dBu 10dB switch calibration 0VU 14dBu Power Requirements Internally set to 230V 50Hz or 115V 60Hz op...

Страница 21: ...hip will be repaired free of charge The warranty excludes damage caused by deliberate or accidental misuse tampering operation on the incorrect mains voltage or without the correct type and value of f...

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