Drawmer 1972 Panduan Memulai Cepat - Halaman 2

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Features

The 1972 Dual Mic, Line & Instrument Pre-Amplifier has been

developed to make it ultra easy for you to capture perfect

recordings every time. The 1972 gives you the ability to record

pristine audio from a variety of sources and especially makes

the most of the multitude of microphones that you find in the

studio, from budget to high-end dynamic and also ribbon mics.

The 1972 uses the latest THAT Corporation technology in the

two independent mic preamps to provide ultra clean,

transparent and precise recordings, with each channel

capable of 66dB of stepped gain, with an additional +/-12dB's

trim at the output, and incorporates switchable mic impedance

for accurate mic matching to bring out the best from any

microphone used, and also provides a way to "sculpt" the sound

of passive dynamic, and especially low-impedance ribbon

microphones.

As well as standard features that you will find on most

preamplifiers, such as phase reverse, the 1972 also has a

wealth of tools that help when recording difficult sources,

making it possible to get the best quality recording with ease:

Fully variable LoCut and HiCut controls have been included to

allow you to tune into recordings and remove superfluous

signals in the low and high frequencies, removing rumble and

hiss with ease.

In addition the Shape feature allows you to bring out the bass or

treble using a subtle tilt EQ.

A unique feature that has been developed by Ivor Drawmer and

currently only available on the 1972 is the Lift control. Lift is

essentially a low level dynamic gain module which has no effect

on signals above 0dB. This makes it possible to record very

quiet signals in a transparent and natural way without

distortion and clipping taking place on the louder passages, and

is especially effective for very dynamic signals, finding great use

in recording piano, and on all vocals including speech, and for

capturing ambiance.

Connector Wiring

XLR INPUT

XLR OUTPUT

(FEMALE)

(MALE)

IF GROUND HUM LOOPS

OCCUR DISCONNECT

GROUND HERE ON ONE

END OF CABLE

(COLD)

+ (HOT)

SCREEN

BALANCED MONO JACK

INSTRUMENT JACK

IF GROUND HUM LOOPS

OCCUR DISCONNECT

GROUND HERE ON ONE

END OF CABLE

(COLD)

+ (HOT)

SCREEN

The 1972 will be supplied with a power cable and an integral fuse suitable for

domestic power outlets in your country. If the fuse blows or the unit is to be used

with a different mains operating voltage see the User Manual for instructions.

Controls

The two channels of the 1972 are completely

identical to each other, from the matching

connectors on the rear to the identical front panel

controls. They are also entirely independent of

each other and cannot be linked.

SELECT

Instr./Line/Mic 2.4k,600 & 200 Ohm/Mic +48V

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.

When in the INST. position the channel takes its

source from the instrument jack found on the front

panel, to the right of the switch.

In the LINE position the signal comes via the

dedicated input XLR on the rear panel. Note that

the Line input has an automatic level pad of 24dB.

The remaining four positions all take their source

from the dedicated microphone input on the rear

panel. The first three positions set the load

impedance of 200, 600 and 2.4k Ohms in order to

aid the matching for a dynamic microphone.

In the +48V Phantom Power switch position the

red LED will illuminate to indicate that 48V of d.c.

voltage is being sent down the XLR cable to power

the electronics of a condenser microphone.

NOTE: DO NOT ACTIVATE THE +48V SETTING

UNLESS THE MICROPHONE REQUIRES IT.

INSTRUMENT INPUT

A 1/4" jack provides an instrument input stage

suitable for use with active and passive guitars as

well as with electronic keyboards.

Off - On

PHASE REVERSE

Reverses the signal polarity, and is often useful

when recording an instrument with more than one

microphone, which would cancel each other out

partially, resulting in a very thin sound. Reversing

the phase of one channel would rectify this.

0 - +66dB

INPUT GAIN

A twelve position switch adds gain in 6dB steps

from 0dB to +66dB, giving total control and easy

repetition. Set the level for any given source to

0dBs to provide the best volume, a LED Meter

above, with settings of -20, -10, 0 & +10dBs

displays this input level. This can be fine tuned later

by the O/P Trim.

Channel 1

Off - On

A variable high and low pass filter can be switched

in and out of the signal path via this switch. The two

filters combine to help remove any extraneous

noise and tune in to the required signal.

LoCUT

15 - 350Hz

The variable high-pass filter (aka Low Cut) is used to

attenuate low frequency signals that might

otherwise prove troublesome, eg. traffic rumble or

stage vibration, and let the higher frequencies pass.

1.5 - 20kHz

HiCUT

The variable low-pass filter (aka High Cut) is used to

attenuate high frequency signals that might not be

required eg. sibilance and hiss, and let the lower

frequencies pass.

LIFT

LIFT is a single switch solution to recording low

signal levels. It has no effect on signal levels above

0dB but increases gain dynamically on lower levels

allowing you to capture audio that would not

normally be recorded, or would require more

sensitive microphones. (see rear).

SHAPE

The Shape feature is a fixed tilt equaliser whereby

the signal increases and decreases by the same

amount around a fixed frequency (500Hz),

allowing for subtle Cut/Boost to shape the audio.

T h e b a s s

f r e q u e n c i e s a r e

boosted and the high

frequencies cut by

-1

-2

2 . 5 d B ( a t t h e

-3

extremes).

-4

40Hz

500Hz

Channel 2

T h e b a s s

frequencies are cut

a n d

t h e

h i g h

frequencies boosted.

-1

-2

-3

-4

40Hz

500Hz

However, note that when both switches are active

they interact with each other and provide a classic

"smiley face"

curve that will boost

the low and high

f r e q u e n c i e s b y

-1

a p p r o x i m a t e l y

-2

-3

1.5dBs, with a slight

-4

cut in the mids of 1dB.

40Hz

500Hz

-12dB - +12dB

OUTPUT TRIM

Because the Input Gain switches the volume in

6dB steps the Output Trim, being a continuous

control, is used to finely adjust the output to the

absolute desired level. With this combination a

maximum of 72dBs of gain is achievable

VU METER

A backlit moving coil VU meter displays the level of

the output signal as found at the output XLR.

VU - +10dB

+10dB Pad

Adjusts the meter to show either normal output

level, (and for those working at 'hot' output levels)

VU +10dB i.e. with the switch at VU +10dB, when

the VU meter reads 0dB the actual level is +10dB.

10kHz