Drawmer 1978 Посібник оператора - Сторінка 8

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1. Specification

H.F. Level

As the H.F. Level is increased the compressor's side chain sensitivity to high frequencies is reduced, with the

result that less gain reduction is applied to those frequencies, creating the effect that the higher frequencies are

enhanced. It can be used to add definition, particularly to the human voice and acoustic

Switches the tonal shaping in and out (i.e. bypassing the sidechain) to allow for A/B comparisons between settings.

Note that Tonal Shaping and the rear panel sidechain Inserts work simultaneously and in conjunction with each

other - this provides an incredible amount of control over the compressor sidechain. If you wish to use the external

inserts only the shaping bypass switch should be out, so that the front panel shaping is not active but the inserts

are. Should you wish to use the front panel shaping only either disconnect the jacks from the insert connectors or

set the external unit into bypass.

Because the shaping controls have bell

frequencies as well as shelf they cover

the full range of frequencies available

within the 1978, and thus, it is possible

to control the mid frequencies using just

the front panel shaping controls, without

the need for an external insert. If you set

the L.F. Frequency to 400Hz Bell and the

H.F. Frequency to 3kHz Bell you are effectively controlling the mid range with a wide bandwidth in just the same

way as you would control the L.F. and H.F. This could be used to adjust the overall balance of a mix, or on individual

instruments, to bring out the raspiness in a voice, for example.

As well as affecting the sidechain the shaping controls also add a small amount of E.Q. to the signal. This varies in

conjunction with the L.F. and H.F. Level controls - as these are set higher the E.Q. level also rises to a maximum

of +3dB when the level controls are in the 10 position.

This feature can be disabled using internal jumpers. Please contact [email protected] for details.

5 - OUTPUT

Mix

A variable control that mixes a user defined amount of 'uncompressed' signal (dry) with the compressed signal

(wet) to create a 'parallel compression effect' without the need for external mixing devices. In this way the amount

of overall compression on the stereo signal is under complete control - set the 1978 to provide heavy compression

but then reduce the overall effect by mixing in some of the dry signal using the mix control.

Bypass

A fully balanced hard-wire unit bypass connects the input directly to the output without alteration.

Note: To see the input level on the VU meters the Bypass switch should be on, as the meters display the level found

at the output.

Gain

During compression the signal is attenuated, gain may be required to produce the required output level. Adjust so

that the output signal approaches the desired level only on signal peaks. The amount of gain required in order to

bring the signal level to the same is at input is displayed on the G.R. meter.

6 - VU METERS

Left / Right VU Meters

Two moving coil VU meters monitor the level of the output signal. Because the meter has VU characteristics, it

closely reflects what is actually being heard, though will not respond quickly enough to register short signal peaks.

Note that the meters are back lit yellow to aid reading in low light environments, however, as the Saturation is

increased the back light turns red to indicate the 'warmth' that the 1978 is creating.

+10dB Pad

A two position switch adjusts the meters to show either normal output level, and for those working at 'hot' output

levels VU +10dB modes. i.e. with the switch at VU +10dB - when the VU meter reads 0dB the actual level is +10dB.

0 to 10

Off / On

WET / DRY

Off / On

-20 to +10dB

0dB / +10dB

DRAWMER 1978 O

PERATOR'S

instruments.

ANUA