Bedienungsanleitung Allen-Heath GL 4000 (Seite 19 von 54) (Englisch)

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STEREO INPUT

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 ØR

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.

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