Bedienungsanleitung Allen-Heath GL 3300 (Seite 11 von 20) (Englisch)

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GL3300 U

SER

UIDE

INPUT CHANNELS

Plug in a microphone or line level source. Use

balanced cables where possible to prevent

interference pickup on long cable runs.

Unbalanced sources may be connected by

linking signal cold to ground (XLR pin 3 to pin

1, jack ring to sleeve) at the connector.

For line sources on XLR simply

plug into the XLR with the jack

socket unplugged.

For balanced microphones which require

phantom power select +48V. If required this

switch may be disabled by an internal link.

Switch off channel +48V when the inputs are connected to non-

phantom powered, line or unbalanced sources.

Use the PFL system to listen

to the signal and fine tune the

gain setting.

MONO

STEREO

φ PHASE reverses the phase of the input

source to correct the phase differences often

encountered in microphone placement, or due

to incorrectly wired cables (pin 3 hot instead of

pin 2). May also be used to minimise acoustic

feedback between closely positioned

loudspeakers and mics in live sound mixing.

The stereo φL reverses the left input phase only

to correct for differences between left and right

signals, or for MS microphone techniques.

MIC/LINE selects line sensitivity on the jack

input when pressed. Or becomes a 20dB pad

for the XLR input when no jack is plugged in.

GAIN matches the level of the input source to

the normal operating level of the console.

Adjust this to read an average '0dB' on the

channel meter (yellow LED). Use the PFL

system to listen to the signal and fine tune the

gain.

100Hz lo-cut filter removes low frequency

noise such as microphone pops, stage noise

and transport rumble before the pre-amp stage.

The lo-cut filter is independent of the equaliser.

The 4-band EQ lets you adjust the tonal

quality of the sound in 4 separate bands. HF

(treble) and LF (bass) are shelving while the 2

mid bands MF1 & MF2 are peak/dip with a Q

of 1.6. This is optimum for both corrective and

creative equalisation. The controls are centre

detented for centre flat response. Press EQ IN

to switch the EQ into the signal path.

The 2 mid frequency bands on the mono input

channel may be swept across a wide frequency

range to tune into the exact frequency required.

The mid bands are overlapping to provide

additional cut or boost when required.

The EQ on the stereo inputs has the 2 mid

frequencies at 250Hz and 2.5kHz. This

provides optimum control over boomy or boxy

sounds (MF2), and to add presence and sparkle

to vocals etc. (MF1). The stereo channels are

well suited to stereo miking, dual mic mixing,

or returning keyboards and effects processors

to the mix and monitors.

Both L and R up gives you a

true stereo channel. Press both

to mono the source. Press just

one to select one side only as

a mono source.

Separate GAIN

controls for L and

R inputs let you

adjust the balance

between the

sources, or treat

each as a separate

source.

For line sources on

XLR simply plug

into the XLR with

the jack socket

unplugged.

Plugging a jack into the INSERT socket

breaks the signal path between the input

preamp/filter and the EQ to let you add an

external signal processor such as a compressor

or noise gate into the channel signal path

Use a suitable Y-lead or suitable TRS jack

lead to connect to the external processor.

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Allen-Heath GL 3300 Seite 11

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