User manual ART 455

[. . . ] 441 DUAL CHANNEL 15 BAND 2/3 OCTAVE GRAPHIC EQUALIZER 451 SINGLE CHANNEL 31 BAND 1/3 OCTAVE GRAPHIC EQUALIZER 455 DUAL CHANNEL 31 BAND 1/3 OCTAVE GRAPHIC EQUALIZER The new ART 400 Series of Precision Graphic Equalizers have been designed and engineered to exceed extremely high standards for audio performance and functionality. These innovative, high-quality equalizers are perfect for virtually any audio application where precision frequency tailoring, reliable performance, rugged design and extremely silent processing is of the utmost priority. Active Filter Sections The 400 Series of Precision Graphic Equalizers feature active filter sections, which incorporate a constant-Q design. This constant-Q design, with accurate precision center frequencies, ensures that the bandwidth of every individual filter will be narrow enough to prevent unnecessary interaction between filters, yet still create an equalization curve wide enough to produce the exact and precise processing of audio frequencies the user seeks. Precision Slide Potentiometers The 400 Series of Precision Graphic Equalizers utilize two x thirty-one 20mm oil-damped precision slide potentiometers. [. . . ] The level control operates between off and +6dB. Note: If there is too much gain, your equalizer has a red LED Clip indicator that illuminates when signals are within 4dB of clipping. If the Clip LED flashes occasionally, this is okay, but if this LED is steadily on you must readjust the level control. INITIAL SET UP Here are some tips to help you with the initial set up: 1. Set channel levels to the center detent 0dB on the front panel. Select the Bypass switch to bypass the equalizer (Note: The red LED is on). Set the frequency slide controls to the center detent (or 0dB). 4 4. Select the 6dB range switch (Note: The green LED is on). Release the bypass switch (Note: The red LED is off). If the Clip LED is on, you must turn down the input level control. 8. You may now start equalizing your system. If you do not have enough equalization control, switch the range switch to the 12dB setting. FRONT PANEL CONTROLS 1. POWER SWITCH To turn the equalizer ON or OFF, press the upper or lower portion of this button. CAUTION: Always turn on your equalizer BEFORE your power amplifiers are turned on, and always turn off your equalizer AFTER your power amplifiers have been turned off. FILTER LEVEL CONTROLS Each of these sliders controls the output level of each of the 31 (or 15) bandpass filters. A detent at the center position helps center the controls for a flat response. FILTER RANGE SWITCH & INDICATORS The gain range of the filter sliders is switchable (as a group) from +/- 6dB to + /-12dB for maximum boost/cut capability. At 6dB the green LED will illuminate, and at 12dB the yellow LED will illuminate. 5 4. BYPASS SWITCH & CLIP INDICATOR LED Bypass Switch: When the red LED is illuminated, this indicates that the unit or channel is in the bypass mode. Signal is routed directly from the input to the output without passing through any circuit (often referred to as "hard-wire bypass"). Use this switch to compare equalized and unequalized material, or to bypass the EQ section in the event of power loss or unit failure. Clip Indicator: - This red LED illuminates if any section of the equalizer is within 4dB of clipping. [. . . ] CAUTION: Only one of these sockets should be chosen for audio connection at the same time. This warranty is void if the serial number is altered, defaced, or removed. A R T 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. A R T shall not be liable for any consequential damages, including without limitation damages resulting from loss of use. [. . . ]