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Pro VLA II™

PROFESSIONAL TWO CHANNEL VACTROL

®

/TUBE LEVELING AMPLIFIER

USER’S GUIDE

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Summary of Contents for Pro VLA II

Page 1: ...Pro VLA II PROFESSIONAL TWO CHANNEL VACTROL TUBE LEVELING AMPLIFIER USER S GUIDE ...

Page 2: ...obstruct the ventilation slots or position the unit where the air required for ventilation is impeded If the unit is to be operated in a rack case or other furniture ensure that it is constructed to allow adequate ventilation Moisture To reduce the risk of fire or electrical shock do not expose the unit to rain moisture or use in damp or wet conditions Do not place a container of liquid on it whic...

Page 3: ...ontrol 6 Attack Control 6 Release Control 7 Gain Reduction LED Meter 7 Bypass Switch 7 VU Meter 7 VU Meter Source Switch 7 LED Output Meter 8 The Link Switch 8 REAR PANEL I O 9 Balanced Inputs 9 Balanced Outputs 10 I O Level Switch 10 APPLICATIONS 11 Compressor Limiter 11 Stereo Mix and Mastering 11 Vocal and Instrument Leveling 11 WARRANTY INFORMATION 12 SERVICE 13 SPECIFICATIONS 14 LIST OF FIGUR...

Page 4: ...isolator Vactrol tube based leveling amplifier Stereo linking of channels Master Volume and Balance control in Link Mode Hand selected 12AT7 Tubes Vactrol Analog Optical Isolators AOI Non VCA design transparent classic sound VU metering of input and output levels LED metering of output level with peak hold function XLR balanced inputs and outputs 1 4 TRS active balanced inputs and outputs Variable...

Page 5: ... America have been modified to comply with the required electrical specifications Under no circumstances should the power cable be altered If the cable becomes cut or damaged discontinue its use and have it replaced before operating the Pro VLA II The power source must provide a good ground connection and the ground pin on the mains plug should never be defeated Analog Audio Connections Audio conn...

Page 6: ...es the threshold Proper setting of the INPUT THRESHOLD control is dependent on the input signal The output of a guitar can be 20dB to 10dB whereas the level from an insert on a mixing console can be 10dB to 15dB The easiest way to set the INPUT THRESHOLD control is to start with the control fully clockwise Slowly turn the control counter clockwise lowering the threshold until the yellow 0 LED ligh...

Page 7: ...1 output is fully muted Attack Control The ATTACK control sets the time it takes the Compressor Limiter to respond to increases in signal level by reducing gain You can use this control to shape the front end of the dynamics envelope One example is to listen to a snare hit and adjust the ATTACK control A short attack makes the snare sound thin As the attack time goes longer the knob is turned cloc...

Page 8: ...annel also known as a hardwire bypass The switch is lit when the unit is bypassed unless power is off yet the analog signal still passes from input to output VU Meter The input or output levels of the Pro VLA II can be monitored by the analog VU meter The VU METER switch selects the source of the audio for this meter The ballistics characteristic of the meter provides an accurate indication of the...

Page 9: ...the output level 0 on the meter corresponds to an output level of 16dBu when the I O level switch is in the 4 mode When in the 10 mode this level becomes 6dBu The Link Switch The two channels of the Pro VLA II can be configured for stereo operation by depressing the LINK switch Link Mode ties the output attenuation of both channels together onto the CH1 OUTPUT LEVEL knob and moves all control over...

Page 10: ...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 II it is desirable to run the instrument into a preamp ahead of the Pro VLA II This will provide a stronger signal and will keep noise to a minimum Microphones must connect through a microphone preamplifier like the ART MPA GOLD before conne...

Page 11: ...er corresponds to 4dBu about 1 23 Volts RMS 0 on the LED bargraph OUTPUT LEVEL meter corresponds to an output level of 16dBu into a balanced load I O Level Switch The Pro VLA II can be optimized for either professional 4dBu or consumer 10dBV I O levels When the switch is depressed the unit is in professional levels mode This shifts the levels such that 0 VU on the meter corresponds with 4dBu on th...

Page 12: ... the Pro VLA II is ideal for processing mixes when recording to DAT hard disk or analog recording devices Used as a mastering device the Pro VLA II is capable of adding warmth and impact to the overall signal level Pro VLA II is ideal for live use as well Vocal and Instrument Leveling The musical nature of the Pro VLA II makes it ideal for use on a wide range of instruments and vocals Place the Pr...

Page 13: ...ions This warranty does not apply in the event of misuse or abuse of the product or as a result of unauthorized alterations or repairs This warranty is void if the serial number is altered defaced or removed ART reserves the right to make changes in design or make additions to or improvements upon this product without any obligation to install the same on products previously manufactured ART shall...

Page 14: ...lt go to www artproaudio com You may contact Customer Service for more assistance or directly request a Return Authorization for service in the resources area of the website 3 If you are returning the unit for service pack the unit in its original carton or a reasonable substitute The original packaging may not be suitable as a shipping carton so consider putting the packaged unit in another box f...

Page 15: ...lease Time 150msec to 3 sec variable Slope Variable 2 1 to 20 1 Max Attenuation 30dB Dimensions 3 50 H x 19 0 W x 9 17 D Weight 10 5 lbs Power Requirements USA 105 to 125 VAC 60 Hz Export units configured for country of destination Note 0 dBu 0 775 VRMS 0 dBV 1 VRMS ART maintains a policy of constant product improvement ART reserves the right to make changes in design or make additions to or impro...

Page 16: ...www artproaudio com E mail support artproaudio com 2007 Applied Research Technology 213 5004 100 e 15 ...

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