User manual ART DPS II

[. . . ] IMPORTANT SAFETY INSTRUCTION ­ READ FIRST This symbol, whenever 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. Read manual. Read instructions: Retain these safety and operating instructions for future reference. Heed all warnings printed here and on the equipment. Follow the operating instructions printed in this user guide. [. . . ] No other microphone preamp is as user-friendly as the DPS II. LED Input Meter The Input Meter displays the output level of the discrete mic pre-amp, before the tube gain circuit. This peak-weighted meter allows you to get the best noise performance out of the unit and prevent input clipping. The signal level should average ­6 to 0 dB on the meter, occasionally hitting the clip light on the highest peaks. When the meter is in this range, you are getting the lowest noise and distortion out of the pre-amp stage. -8- Adjust the Input control to keep the meter in this range. The +20dB switch does not affect the meter, as it is part of the tube gain stage. VU Meter The VU Meter gives an analog representation of the DPS II output signal level. Besides showing the average analog level, it is sensitive to attack transients. When not using OPL, the VU Meter is a great indicator of how hard you are running the tube. It also helps in setting a consistent level as you change mics and instrument sources. The VU Meter also reflects the impact of the OPL circuitry on the signal. For example, if the signal is "in the red" on the meter, the meter will reflect the attenuation of the signal when the OPL is activated, and the signal is brought out of the "red". Output Control The Output Control sets the output level of the DPS II. When the control is fully counterclockwise, there is no output. Turning the control clockwise increases the level of the output signal. When setting the Output level control, refer to the VU Meter for an accurate level leaving the preamp. The marking on the output control determines the meter calibration to output level. If the Output control is set to ­10, then the output of the unit is ­10dBu when the meter reads 0 VU. For +4 (pro) systems, set the Output control to +4 and the meter will be calibrated to your system levels. DIGITAL CONTROLS Digital Level Knobs The digital level knobs control the input gain to the digital converters of the DPS IITM. The purpose of the digital level control is to get the loudest possible signal into the converters before clipping starts to occur. The front mounted clip lights easily notify the user before digital clipping occurs. For the optimal input signal, raise the gain until the digital clip lights just start to flicker, then back off on the digital level by a hair until the clip lights go out. One should most likely test this using the hottest signal they will be using (or use the OPLTM feature on the V3TM setting to get your levels just right. ) -9- There are several paths in which audio can reach the digital signal converters. One is the using the analog inputs of the DPS IITM. When used in said manner, the analog signals of both channels in the DPS IITM automatically go into the digital converters. [. . . ] 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. For units purchased outside the United States, an authorized distributor of Applied Research and Technology will provide service. - 17 - SERVICE The following information is provided in the unlikely event that your unit requires service. 1) Be sure that the unit is the cause of the problem. [. . . ]