User manual ART HD231

[. . . ] Environment: Protect from excessive dirt, dust, heat, and vibration when operating and storing. Avoid tobacco ash, drink spillage and smoke especially that associated with smoke machines. To avoid injury to yourself or damage to the equipment take care when lifting, moving or carrying the unit. Servicing: Switch off the equipment and unplug the power cord immediately if it is exposed to moisture, the power cord or plug becomes damaged during a lightning storm or if smoke odor or noise is noted. [. . . ] XLR connections are balanced where pin 2 is High (+), pin 3 is Low (-), and pin 1 is ground. When balanced, the tip is High (+), the ring is Low (-) and the sleeve is ground. To use unbalanced use a mono ¼" phone cable, this will automatically ground the ring to the sleeve. 4 EUROBLOCK CONNECTIONS Insert the wires, and then snug down with the set screw. The entire barrier strip can be removed for quick service without disconnecting the individual wires. SIGNAL LEVELS Signal levels from -10dBu to +4dBu are considered normal with maximum levels of approximately +22dBu balanced or +16dBu unbalanced. Most Microphones, as well as instrument pickups, require a preamp to get the signal level up to a line level. The outputs of the equalizer are also designed to connect into line level inputs and should not be connected into sensitive Microphone or Instrument Inputs for best results. CHASSIS GROUNDING The equalizers are equipped with a rear panel Ground Lift switch. After set up, if your system exhibits excessive hum or buzzing, the problem may be a due to a ground differential between your equalizer and other equipment in the same system. The Ground Lift switch lets you try several combinations to minimize system hum. Try different combinations of lifting grounds on units that are supplied with ground lift switches or make sure all chassis are connected to earth ground, either through the AC Power cord ground or by the front panel rack mount screws. If the HD series equalizer is mounted in a grounded rack of equipment, the ground to the case of the equalizer may be lifted to prevent multiple ground paths, which may cause a ground loop to occur. 5 OPERATING INSTRUCTIONS Before starting to equalize your sound system there is some information you should know and procedures you should follow. The bypass switch, when activated, lights the bypass LED and cancels all equalization settings while allowing signal to flow directly through the unit at unity gain. Also included is a range selection switch with LED indicators, +/-6dB = green, +/-12dB = yellow. In addition to the range selection switch there is an output level control potentiometer. Note: If there is too much gain, your equalizer has a red LED Clip indicator that illuminates when signals are within 6dB of clipping. If the Clip LED flashes occasionally, this is okay, but if this LED is steadily on you should reduce the level control. INITIAL SET UP Here are some tips to help you with the initial set up: 1. Set channel output levels to the center detent 0dB on the front panel. Select the Bypass switch to bypass the equalizer (Note: The red LED is on). Apply signal to the system and if the Clip LED is on, reduce your signal to the unit. If you do not have enough equalization control, switch the range switch to the 12dB setting. 6 FRONT PANEL CONTROLS 1. POWER SWITCH To turn the equalizer ON or OFF, press the upper or lower portion of this button. [. . . ] 2) If you find the unit to be at fault, write down a complete description of the problem, including how and when the problem occurs. Please write down a description of your complete setup before calling Customer Service. 3) Contact our Customer Service department at (716) 297-2920 for your Return Authorization number or questions regarding technical assistance or repairs. Customer Service hours are 9:30 AM to 5:00 PM Eastern Time, Monday through Friday. [. . . ]