ALLEN & HEATH WZ20S User's Guide download pdf (Page 13)

WZ20S User Guide 13

Connecting the Mono Channel

MIC 4

+ 48V

DIR

OU T

INSERT

INPUT The input provides both an XLR and a TRS jack connector. The XLR is

normalled through the jack connector. This means that plugging in a jack overrides the

XLR source. Plug a microphone into the XLR socket leaving the jack unplugged. Plug a

line level source into the jack socket and select the front panel PAD switch. For line level

sources on XLR plug into the XLR leaving the jack unplugged and select PAD. This

feature lets you connect a wide 70dB range of mic or line sources on either XLR or jack.

Both XLR and jack inputs are 3 wire balanced. This prevents interference pickup on long

cable runs when connecting to balanced sources such as microphones. To connect an

unbalanced XLR source link Pin 3 to Pin 1 in the XLR plug. The jack input automatically

grounds the cold (-) input to accept unbalanced TS (mono) jack sources. To connect an

unbalanced source using a TRS (stereo) jack you should link ring to sleeve in the plug as

shown above. Do not select +48V phantom power when connecting unbalanced

sources.

MIC +48V Press this tamperproof underpanel switch when connecting to microphones

such as condenser types which require phantom power. This provides +48V DC to pins

2 and 3 of the XLR.

WARNING Do not connect unbalanced sources or cables to the XLR inputs

when phantom power is selected. Use +48V only with balanced microphones

which require powering. Note that harm will not be done to non powered

microphones as long as they are balanced. To avoid loud clicks always turn the

channel off by releasing the ON switch when switching +48V on or off and when

plugging or unplugging microphones.

INSERT You do not need to plug anything into the insert socket for normal operation. It

is a break point that lets you plug in an external signal processor such as a compressor

or noise gate if required. Plugging in a jack breaks the signal path after the input pre-

amp and before the EQ. The signal is unbalanced and operates at a nominal 0dBu line

level. Use a TRS jack wired as shown above to connect the SEND to the processor input

and the RETURN from the processor output. The sleeve provides the common ground for

cable screening. Use a TRS Y-adapter and two standard jack leads or wire two leads to

a TRS plug. If required you can tap off the send to provide an alternative pre-EQ direct

output by plugging in a lead with tip and ring shorted together so that the channel signal

path is not interrupted.

DIR OUT This provides a post-fader direct output for connection to external processing

or recording equipment. This can be set to pre-fader by changing an internal link option.

The output operates at 0dBu and is impedance balanced on TRS jack to provide the

benefit of interference rejection when connecting to equipment with balanced inputs. You

can also connect to unbalanced equipment as shown above.

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ALLEN & HEATH WZ20S User's Guide Page 13

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