Art Pro VLA Guide de l'utilisateur télécharger pdf (Page 7)

equipment.

Do not use both inputs on a channel at the same time.

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The outputs of the PRO VLA are active balanced. You may use

these in unbalanced configurations without harm to the output

circuitry. Use the unbalanced 1/4” jack for sending your signal

to amps, processors or other unbalanced configurations. Use

the XLR output to send signals to equipment which accepts XLR

connections. Both outputs may be used at the same time.

**Note: If you experience a grounding hum when using both

output connectors simultaneously, a ground loop may be the

problem. To remedy this problem, disconnect (lift) the ground

wire (pin 1) from the XLR cable plugged into the PRO VLA’s

output. This interrupts the ground path and therefore breaks

the loop.

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The main application of the PRO VLA is to control the dynamic

range of a signal level. Plug a line level (post preamplifier or

other gain stage) source into either input and set the threshold

and output controls to provide the desired amount of compres-

sion to the input signal.

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Because of its low noise and excellent tonal qualities, the PRO

VLA is ideal for running mixes through before recording to

DAT, hard disk or analog recording devices. Used as a master-

ing device, the PRO VLA is capable of adding warmth and

impact to the overall signal level. The PRO VLA is ideal for live

use as well.

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The musical nature of the PRO VLA makes it ideal for use on a

wide range of instruments and vocals. Place the PRO VLA into a

channel insert, after a preamplifier, or from a direct output of a

channel of a mixer. Adjust the controls of the PRO VLA to

achieve the desired amount of compression.

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Each channel of the PRO VLA has a ten segment LED gain

reduction meter. These meters provide a visual indication of

how much compression is taking place. The right-most LED in

these meters is the Threshold LED. The Threshold LED will

light when the input signal reaches the level set by the

Threshold control. The range of the meter is -1dB to -30dB.

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Each channel of the PRO VLA has a backlit VU meter showing

either the input or output level (switch dependant). The zero

(“0”) level is calibrated to +4dBm (with a 600 ohm load on the

XLR output or a high impedance load on the 1/4” output). Use

the VU meter to view input (unprocessed) and output

(processed) levels. The meters are active when the PRO VLA is

in bypass.

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It’s easy to interface the PRO VLA with other equipment.

Balanced XLR and balanced 1/4” phone, input and output con-

nectors are located on the rear panel.

The PRO VLA’s XLR connectors follow the AES standard of: Pin

1 = Ground, Pin 2 = Hot (+), Pin 3 = Cold (-). The balanced

1/4” phone jacks are typical TRS connections: Tip - Hot (+),

Ring - Cold (-),

Sleeve - Ground.

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The PRO VLA provides both an XLR and 1/4” input jack. Both

jacks are balanced. The 1/4” jack can be used with unbalanced

signals by simply plugging in an unbalanced cable. The inputs

are designed for use with line level signals ranging from -

30dBm to +20dBm. While it is possible to plug an instrument

directly into the PRO VLA, it is desirable to run the instrument

into a preamp before the signal runs into the PRO VLA. This

will provide a stronger signal and will keep noise to a mini-

mum. Microphones must be run into a microphone preamplifi-

er (like A R T’s PRO MPA) before being run into the PRO VLA.

Use the XLR input for use with equipment that provides an XLR

output. Use the 1/4” input jack for balanced or unbalanced 1/4”

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Art Pro VLA Guide de l'utilisateur Page 7

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