Focusrite Green Range Скачать руководство пользователя страница 19

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Changing a Fuse

We strongly recommend that you do NOT attempt to change fuses unless you are

absolutely certain that you know exactly what you are doing. If you are in any doubt

whatsoever, contact your dealer or the factory before you open the module.

To change a fuse, if you are certain of your technical ability:

1. Disconnect the mains cable.

2. Viewing the module from the back, remove the four screws that secure the back
panel (there are two at each end).

3. Carefully slide out the inside of the unit with a downward motion. (see diagram)

4. The fuse is in a holder close to the transformer. To remove the fuse, pull off the
top of the fuse holder, which holds the fuse.

5. Replace the fuse with a 250 mA anti-surge type.

6. When you have replaced the fuse, slide the inside of the unit back into the
outer cover.

7. Replace the four screws in the back panel.

v o i c e b o x

Chassis Sleeve

PCB

Front

Rear

Содержание Green Range

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Страница 2: ... 11 Setting the Threshold 11 Ratio 11 Setting the Ratio 11 Auto Rel 12 Make up Gain 12 How to Use Compression 12 When to Use Compression 13 De esser 14 Controls 14 How to Use the De esser 14 Equaliser 14 Low and High EQ 15 Controls 15 Using the Low and High EQ 16 Mid EQ 16 Controls 16 Using the Mid EQ 17 How to Use Equalisation 18 When to Use Equalisation 18 Stereo Linking 19 Section iii Trouble S...

Страница 3: ...controls for that part in turn to hear how they affect the sound Working with a familiar track makes interpretation of the results easier Note however that tracks are already compressed for CD so you may find it hard to hear the results of using the compressor and de esser If this is the case try using samples instead if you have access to them or record your own track uncompressed and then play i...

Страница 4: ...eset to the local supply voltage which is clearly marked on the rear of the module Check that the voltage is set correctly Signal Connections All the signal connections are via connectors mounted on the rear panel Standard XLR connectors are used for all mic and line level signals and are wired to the AES standards which are Pin 1 Screen chassis Pin 2 Live audio 0 Pin 3 Return audio 180 For all in...

Страница 5: ...he Mute switch mutes the channel that is it reduces the volume to zero This can be useful during a live performance for example between songs You can mute the channel manually using the switch on the front panel or you can mute it remotely by connecting a suitable switch to the external jack socket on the rear panel The diagram below shows the circuit for such a switch When you trigger the externa...

Страница 6: ...ne it is possible for the signals from the microphones to be out of phase which affects the quality of the recording since signals that are out of phase tend to sound thin For example when recording a snare drum with two microphones one on the top of the snare the other on the bottom they will be out of phase Use the phase switch to reverse the phase on one of the microphones but not both it norma...

Страница 7: ...rally quickly in this case reduce the amount of expansion by turning the control clockwise The numbers on the control represent the worst case noise buildup during quiet passages for example with the input to register around 0VU on the meter then 40 on the expander control represents 40 dB below that Increasing the expansion by turning the control counter clockwise reduces this worst case level Of...

Страница 8: ... Similarly the dynamic range of the signal can exceed that of the medium used to carry it 16 bit digital recordings such as DAT have a theoretical maximum dynamic range of 96 dB It is essential that you do not exceed this limit Analogue tape has a dynamic range in the order of 60 dB though noise reduction can add between 15 and 30 dB It is not always necessary to limit dynamic range when recording...

Страница 9: ... is the meter lights only the LED for the signal level Since compression reduces the volume of the signal the meter drops as compression is applied for example a 3 dB drop shows as 3 VU on the meter The change to peak action means that it is easy to see when transients occur which will be compressed more heavily The Ratio and Threshold controls set the amount of compression applied to the signal s...

Страница 10: ... how much compression is applied to the signal The ratio such as 2 1 refers to the ratio of change in input level to the change in output level So a ratio of 2 1 means that for every 2 dB change in the input level the output level changes by 1 dB as shown in the following diagram Setting the Ratio As you increase the ratio the sound becomes tighter and the effect of the compression becomes more no...

Страница 11: ...ave set the compression on the signal use the make up gain to restore the signal to its original or desired volume For example in the diagram the compressor reduces the signal by 20 dB which reduces the dynamic range of the input and in so doing makes the signal quieter Using the make up gain restores the volume of the compressed signal If you make heavy use of make up gain you can introduce hiss ...

Страница 12: ...press sooner or later The combination of ratio and threshold determines the maximum level of the loudest sections If the compression sounds unnatural to you try using Auto Rel 4 Adjust the make up gain to set the level of the output signal 5 If you can hear noise buildup during quiet passages adjust the NR control to increase the amount of expansion until the noise is reduced sufficiently When to ...

Страница 13: ...trol until the sibilants are heavily affected 3 Increase the Threshold until the sibilants are compressed in a natural sounding way Equaliser An equaliser is a sophisticated tone control that boosts or cuts selected frequency bands and so alters frequency response By modifying different frequency bands in this way you modify the tone quality of vocals which can fix problems with the original sound...

Страница 14: ... the frequency response towards the low end Controls You can set the frequency and the amount of attenuation or gain applied beyond that frequency Off position To turn off a shelving filter set the gain control in the middle position so that it is neither boosting nor cutting frequencies f u n c t i o n s 15 Flat O dB 18 18 attenuation gain Low Shelf Flat response below selected frequency LOW SHEL...

Страница 15: ...ormation thus giving a bassy sound or to attenuate a sound that is too bassy Use the High Eq to boost ambience and reverb in a room or to attenuate an over bright sound Mid Eq The Mid Eq gives you control over the vocal frequency spectrum Unlike the High and Low Eq the Mid Eq affects only a band of frequencies around a selected frequency The width of the band of frequencies affected is determined ...

Страница 16: ...the De esser to give a more natural sound To isolate the frequency you want to boost or cut 1 Add some gain to the signal so that you can hear the effect easily 2 Ensure that Notch is not switched in so that it is easier to hear the area you are affecting 3 Modify the frequency until you find the area you want to work on 4 Modify the gain to control the amount of the selected frequency that is add...

Страница 17: ...rect use the shelving filters to correct it 5 Create a sound and bring out the character of the voice by using the Eq The table below shows the important frequency ranges for the voice Presence 5 kHz Sibilance 7 5 10 kHz Boominess 200 240 Hz Fullness 120 Hz When to Use Equalisation You can apply equalisation when recording or while mixing down a finished track You usually record flat without equal...

Страница 18: ... heavy use of the compressor and EQ use the NR control to remove it Stereo Linking Two Voiceboxes can be liked together for stereo operation of the compressor and de esser functions Stereo linking requires the connections of a stereo 1 4 jack between the two units inserted in the rear panel socket marked link Non Operation If none of the LEDs light check the mains supply 1 If the module connected ...

Страница 19: ...wing the module from the back remove the four screws that secure the back panel there are two at each end 3 Carefully slide out the inside of the unit with a downward motion see diagram 4 The fuse is in a holder close to the transformer To remove the fuse pull off the top of the fuse holder which holds the fuse 5 Replace the fuse with a 250 mA anti surge type 6 When you have replaced the fuse slid...

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Страница 22: ...n o t e s 23 ...

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