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1 

 

TABLE OF CONTENTS 

TABLE OF CONTENTS.............................................................................................................................. 1

 

INTRODUCTION ......................................................................................................................................... 2

 

W

HY 

C

LASS

-A?............................................................................................................................................ 2

 

W

HY 

T

UBES

?................................................................................................................................................ 3

 

W

HY 

B

ALANCED 

I/O?.................................................................................................................................. 3

 

T

HE 

A2 S

TEREO 

P

ROCESSOR

. ...................................................................................................................... 4

 

PRECAUTIONS ............................................................................................................................................ 5

 

BLOCK DIAGRAM...................................................................................................................................... 6

 

INSTALLATION........................................................................................................................................... 7

 

AC Mains Supply. .................................................................................................................................... 7

 

Audio Inputs............................................................................................................................................. 7

 

Outputs. .................................................................................................................................................... 8

 

Ventilation................................................................................................................................................ 8

 

OPERATION. ................................................................................................................................................ 9

 

Input Gain stage ...................................................................................................................................... 9

 

Tube Stage Drive and Peak LEDs.......................................................................................................... 9

 

W

HAT IS 

C

OMPRESSION

? ............................................................................................................................. 9

 

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 Operation.............................................................................................................................. 13

 

Output Gain. .......................................................................................................................................... 13

 

Digital Output........................................................................................................................................ 14

 

Output Peak LED. ................................................................................................................................. 14

 

GETTING STARTED ................................................................................................................................ 14

 

Using as an inserted dynamic effect..................................................................................................... 15

 

Using to process your stereo mix / mastering ..................................................................................... 15

 

SPECIFICATIONS ..................................................................................................................................... 18

 

Line Inputs: ............................................................................................................................................ 18

 

Outputs:.................................................................................................................................................. 18

 

Tube Stage: ............................................................................................................................................ 18

 

Compressor: .......................................................................................................................................... 18

 

Equaliser:............................................................................................................................................... 19

 

Metering:................................................................................................................................................ 19

 

Power Requirements: ............................................................................................................................ 19

 

Dimensions: ........................................................................................................................................... 19

 

SERVICE ...................................................................................................................................................... 20

 

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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