ALLEN & HEATH GL4800 User's Guide download pdf (Page 22)

22 GL4800 User Guide

The STEREO Input Channel

The stereo channel has two independent input sections: XLR IN for mono

microphone or line input, and STEREO LINE IN on jacks for sources such as

stereo keyboards, voice modules and effects returns. When using the

channel as a mono XLR mic/line input the stereo line input can be

independently routed to L-R for a stereo effects return or additional line input.

The XLR inputs on adjacent channels can be patched into a stereo line when

using stereo or paired microphones.

XLR MIC/LINE INPUT - This section is the same as the mono channel input

except that it has only the XLR input for both mic or line. It uses the same

wide ranging balanced pre-amp stage and includes the swept lo-cut filter and

insert. Refer to the MONO INPUT section for a detailed description of these

controls.

STEREO LINE INPUT - The left/mono and right inputs feed a balanced pre-

amp stage with GAIN variable from fully off to +10dB boost. Press

POLARITY (R) to reverse the phase of the right input signal to correct phase

differences between the inputs. The WIDTH control is normally set to the

centre detented position for normal stereo. Turn anticlockwise to narrow the

stereo image until it becomes mono. Continue anticlockwise to open up the

stereo image but with left and right reversed. Turning clockwise from centre

accentuates the stereo effect by producing a phase enhanced "wide" image.

Press PFL to listen to the stereo signal on headphones or local monitor

without affecting the main outputs.

DIRECT TO L-R routes the stereo line signal to L-R independent of the main

stereo channel which you may be using as a mic/line XLR input. The GAIN

control adjusts the level to L-R. PFL lets you check the post-gain, post-width

stereo signal independent of the main channel PFL.

XLR/STEREO selects the input source to the main stereo channel. When

pressed the stereo line input is selected, when released the XLR mic/line

input is selected.

EQUALISER - This provides separate, simultaneous stereo control of 4

frequency bands. Each band may be boosted or cut by up to +/- 15dB. HF

and LF have a shelving response and affect the high (treble) and low (bass)

frequencies respectively. MF1 and MF2 have a peak/dip (bell shaped)

response and affect the upper and lower mid frequencies respectively. MF1

is centred on 2.5kHz (presence) and MF2 is centred on 250Hz (warmth).

Careful use of the equaliser can go a long way to brightening up the sound of

your stereo instruments, or tuning out the noise characteristic of many lower

cost effects units.

AUXILIARY SENDS - 10 aux sends are provided. These work in the same

way as the mono channel. Note that the left and right signals are combined

as mono aux sends. No direct output facility is available.

ROUTING, PAN, METER and PFL - These are the same as on the mono

channel. When a stereo input is selected PAN acts as a balance control to

adjust the level of the left and right signals relative to each other. The meter

indicates the pre-fade left and right signals combined. PFL operates in stereo

so that you can hear the image of the stereo source and check the relative

levels on the L and R meters.

STEREO

XLR

L-R

DIRECT

STEREO

PFL

+48V

-10

0dB

40dB

200

HPF

400HzOFF

100

50Hz

MIC

LINE

-14

LINE

MIC

PAD

-5

-20

-10

+10dB

0dB

-30

REVERSE

WIDE

MONO

WIDTH

12kHz

2.5kHz

250Hz

70Hz

STEREO

-15 +15

GAIN

STEREO

GAIN

XLR

POLARITYPOLARITY

POLARITY

(R)

EQ IN

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 61 62

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ALLEN & HEATH GL4800 User's Guide Page 22

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