Drawmer 1977 Operator's Manual - Page 6

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PREAMPLIFIER

Select

The source select is a six position rotary switch that, as well as setting the input source, also sets the load

impedance of the microphone.

In the +48V Phantom Power switch position the red LED will illuminate to indicate that 48V of DC voltage is

being sent down the XLR cable in order to power the electronics of a condenser microphone.

NOTE: DO NOT ACTIVATE THE +48V SETTING UNLESS THE MICROPHONE REQUIRES IT.

The switch can also provide three settings of load impedance in order to aid the matching for a dynamic

microphone, at settings of 200, 600 and 2.4k Ohms.

In addition the same switch sets the source to Instrument (via the front panel instrument DI section) and Line

(via the dedicated input on the rear panel).

Instrument Input

A 1/4" jack provides a specialised instrument input stage suitable for use with both active and passive guitar

pickup systems as well as with electronic keyboards. A convenient Instrument Through 1/4" jack is also provided

allowing the instrument signal to be routed elsewhere for alternative processing.

Gain

A twelve position preamplifier switch adds gain in 6dB steps from 0dB to +66dB in Mic mode, making it incredibly

easy to replicate previous settings and have total control over levels.

Note that when the Instrument and Line is selected as the source they have an automatic 24dB pad and so a

gain range of -24 to +42dB is achievable via this switch, as shown by the highlighted graticule markings.

Phase Reverse

This switch reverses the signal polarity, and is often useful when recording an instrument with more than one

microphone. If, for example, you record a guitar cabinet with two mics, the two signals could be so similar that

they would cancel each other out partially, resulting in a very thin sound. Reversing the phase of one channel

would rectify this.

High Pass Filter

Variable Frequency

The signal path incorporates a variable high-pass filter (also known as Low Cut), whose frequency is fully variable

between 16Hz and 130Hz and at a slope of 12dB per Octave, and is used to attenuate low frequency signals

that might otherwise prove troublesome, eg. traffic rumble or stage vibration, and let the higher frequencies pass.

Switch

The high pass filter can be bypassed in order to hear A/B comparisons.

E.Q.>Comp / Comp>E.Q.

Select

The 1977 has very comprehensive Equaliser and Compressor stages that follow the Gain stage. This switch

allows the signal path to either route the signal as Gain-Equaliser-Compressor-Output or alternatively route it as

Gain-Compressor-Equaliser-Output, as each creates a distinctly different tonal quality, and coloration depending

on the setting and allows the engineer to operate the 1977 to their own personal taste. As a very general rule,

using EQ in front of your compressor produces a warmer tone, while using EQ after your compressor produces

a cleaner sound, though this will depend on a number of factors.

CONTROL DESCRIPTION

Mic +48V/Mic 200 Ohm/Mic 600 Ohm/Mic 2.4 kOhm/Line/Instrument

0 - +66dB (Mic) or -24 - +42dB (Instrument)

Off - On

16Hz - 130Hz

Off - On

DRAWMER 1977 O

PERATOR'S

ANUAL

CHAPTER 2