| switch is pressed (LED illuminated). | |
|
| |
4. |
|
|
| A variable frequency filter is provided covering a range of | |
| 20Hz to 200Hz., and this is always in circuit. This may be | |
| found useful to reduce the level of | |
| feedback, or particularly to tailor the output frequency to | |
| match more closely the frequency range of smaller wedge | |
| monitor speakers which may not be able to tolerate high lev- | |
| els of LF signal. Rotate the control fully anticlockwise when | |
| the filter is not required. | |
|
| |
5. | TALKBACK |
|
| Pressing the TALKBACK switch routes the engineer’s talk- | |
| back microphone signal to the monitor output, at the level set | |
| on the T/B gain control on the Master section, and inde- | |
| pendent of the output fader level. At the same time the local | |
| monitor mix is dimmed by approximately 6dB to allow the | |
| engineer’s voice to be heard over the mix, and the Wedge out- | |
| put also dims to prevent feedback through the talkback mic. | |
| Note that Talkback is disabled when DIM is pressed. | |
|
| |
6. | DIM |
|
| Pressing the large DIM switch attenuates the monitor output | |
| by 6dB as an immediate way of eliminating feedback while | |
| the source of the problem is identified. | |
|
| |
7. | PFL |
|
| When the PFL switch is pressed, the | |
| the headphones, replacing the normal submix signal. The | |
| PFL ACTIVE LED on the master section illuminates to warn | |
| that the wedge/phones outputs and the meter are now re- | |
| sponding to the PFL selection and the PFL LED on the input | |
| channel lights to identify the active channel. This is a useful | |
| way of listening to any required signal so that adjustments | |
| can be made or problems traced. | |
|
| |
8. | BARGRAPH METER |
|
| A sixteen segment, three colour bargraph meter monitors the |
output signal. The meter has a peak response, and since it reads the final output signal it will also be affected by the DIM switch and include any talkback signal. The bargraph may be calibrated by a trimmer accessed via a hole in the panel above the meter. Adjustments may be made using a
Page 17