User manual ART PRO VLA II

[. . . ] Pro VLA IITM PROFESSIONAL TWO CHANNEL VACTROL®/TUBE LEVELING AMPLIFIER USER'S GUIDE IMPORTANT SAFETY INSTRUCTIONS ­ READ FIRST This symbol, wherever it appears, alerts you to the presence of uninsulated dangerous voltage inside the enclosure. Voltage that may be sufficient to constitute a risk of shock. This symbol, wherever it appears, alerts you to important operating and maintenance instructions in the accompanying literature. Please read manual. Read instructions: Retain these safety and operating instructions for future reference. Heed all warnings printed here and on the equipment. [. . . ] Units manufactured for use outside of the United States of 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 connections to and from the Pro VLA II are: Balanced input: [XLR] Pin 2 = Hot (+), Pin 3 = Cold (-), Pin 1 = Ground [1/4"] Tip = Hot (+), Ring = Cold (-), Sleeve = Ground Balanced output: [XLR] Pin 2 = Hot (+), Pin 3 = Cold (-), Pin 1 = Ground [1/4"] Tip = Hot (+), Ring = Cold (-), Sleeve = Ground Unbalanced 1/4" cables may be used with no damage to the Pro VLA II. We recommend using only highquality cables equipped with the appropriate connectors. 4 FRONT PANEL CONTROLS and INDICATORS Power The POWER switch turns the power on and off to the unit. The Pro VLA II should be turned "on" with all monitor levels turned down to protect against any "thumping" caused by power up. Likewise, the Pro VLA II should be turned "off" after turning all monitor levels down. In this case if the input signal increased 12dB over the threshold, the output level would only rise by 3dB. In general, compression ratios of 10:1 and greater are considered "limiting". The range of the RATIO control is (2:1) to (20:1). The Pro VLA II may be used as either a compressor or a limiter with all of the following: - Multitrack recorder, DAT machine, hard disk recorder, or analog recorder. - In a mixer's channel insert points. - Between a microphone preamp and signal processors. - Between preamplified electronic musical instruments (synthesizers, guitars, bass, samplers, acoustic instruments with pickups) and other line-level equipment. 5 FIGURE 1 ­ Channel 1 Controls Output Level Control The OUTPUT LEVEL control serves two functions. The CH1 knob always controls the output level of CH1, but can also serve as a "MASTER" output level when the Link Mode is active. The fully counter-clockwise position of the knob mutes the output. The CH2 OUTPUT LEVEL control operates as a standard CH2 level control or as a "BALANCE" control when the Link Mode is active. In Link Mode when the BALANCE control is turned fully counter-clockwise the CH1 output is fully on and CH2 output is fully muted. When centered, both channels have equal gain. When turned fully clockwise the CH2 output is fully on and CH1 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. [. . . ] 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 not be liable for any consequential damages, including without limitation damages resulting from loss of use. Some states do not allow limitations of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty gives you specific rights and you may have other rights, which vary from state to state. [. . . ]