User manual ART XL231

[. . . ] OPERATION MANUAL ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer IMPORTANT SAFETY INSTRUCTION ­ READ FIRST This symbol, whenever it appears, alerts you to the presence of uninsulated dangerous voltage inside the enclosure that may be sufficient to constitute a risk of shock. This symbol, wherever it appears alerts you to important operating and maintenance voltage instructions in the accompanying literature. Read instructions: Retain these safety and operating instructions for future reference. Power sources: Connect the unit to mains power only of the type described in this Operation Manual or marked on the rear panel. [. . . ] When changing the fuse, make sure that you insert the holder in the correct orientation for your local line voltage. 10 ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer INPUT/OUTPUT CONNECTORS Although the XL 231 may be used with unbalanced connections, for optimum performance use balanced connections. Balanced connections help eliminate external sources of electrical noise. Any combination of output connectors may be used. ¼" TRS Phone The TRS (Tip Ring Sleeve) ¼" phone connections may be used balanced or unbalanced. 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. The TRS ¼" Phone connector is balanced and wired as: Tip = High (+) Ring = Low (-) Sleeve = Ground. XLR The XLR input connector is balanced and wired as: Pin 2=High (+) Pin 3=Low (-) Pin 1=Ground. EURO BLOCK The detachable Euroblock connections are wired as shown on the rear panel. 11 ART XL 231 Dual 31 Band, 1/3 Octave Extended, Long Throw, Professional Equalizer APPLICATION NOTES Graphic equalizers may be used wherever modification of the frequency contour of a sound system is needed. A graphic equalizer is a solution to any number of sound problems or creative urges. The Audio Spectrum, a Reference In general, what we hear extends over a range of frequencies from 20 Hertz (Hz) to 20 Kilohertz (KHz). This equates to roughly ten and one third octaves, an octave being a factor of two. The most perceived range lies between 300Hz to 3KHz, the region where most voice information occurs. Low Bass: 20Hz to 40Hz This is the lowest of normally audible octaves. These subaudible frequencies are produced by earthquakes, building vibrations, elephants and huge organ pipes. Low bass information include the fundamental frequencies of the lowest keys on organs, synthesizers and pianos. These low bands on the equalizer may be useful for tailoring the low frequency response of some speakers and microphones. Bass: 40Hz to 160Hz These two octaves are normally perceived as the bass frequencies. Instruments such as the electric and string bass, tuba, bass drum and the lower notes of keyboard instruments fall within this range. Mid Bass: 160Hz to 315Hz In this octave, the transition between bass and midrange occurs. Low frequency crossover points in speaker systems are usually selected in this range. Modification of voice and drum fundamentals as well as the character of the upper bass and lower brass instruments can be achieved by manipulating the levels of these frequencies. Mids: 315Hz to 2. 5KHz The fundamental frequencies of voice and musical instruments occurs within these three octaves. [. . . ] (± 6 dB) or (± 12 dB) Selectable (+6/-9 dB) or (+12/-18 dB) Selectable Off to +6 dB (sliders centered) INPUTS Type Connectors Impedance Maximum Input Level Active Balanced 3-Pin XLR, TRS ¼" phone, Euroblock 9. 4K Ohms Balanced. +24 dBu, Balanced, 1% THD, [EQ and Level centered] OUTPUTS Type Connectors Impedance Maximum Level RFI Input Filters Bypass Switching Clip LED Threshold High Pass Filter High Trim Low Trim Frequency Response THD+Noise (typically 0. 003% @ 1 KHz) IM Distortion (SMPTE) Signal to Noise Ratio Headroom Dynamic Range Channel Separation Common Mode Rejection Line Voltage Input AC Power Construction SIZE WEIGHT Note: 0 dBu = 0. 775 Vrms 3-Pin XLR, Euroblock - Active Balanced TRS ¼" phone - Impedance Balanced 3-Pin XLR, TRS ¼" phone, Euroblock 200 Ohms +26 dBu, Balanced, 20-20K Hz, into 600 Ohms, 1% THD Yes Passive, Relay 3 dB below clipping. 10 to 250 Hz ­ 12dB/Oct ± 4 dB @ 10 KHz ± 4 dB @ 40 Hz [EQ and Level centered, HPF fully counter clockwise] (+0/-0. 25 dB 20-20K Hz), (+0/-1 dB 17-50K Hz), (+0/-3 dB 10-80K Hz) < 0. 005%, @ +4 dBu, 20-20K Hz, 22 KHz BW, [EQ and Level centered] < 0. 004%, @ +4 dBu, [EQ and Level centered] 99 dB, Ref. 0 dBu 123 dB, Ref: +24 dBu, 22 KHz BW 90 dB @ 1 KHz, +4 dBu 60 dB @ 1 KHz 95-125 VAC 50/60 Hz 190-250 VAC 50/60 Hz 31 Watts Typical All Steel Chassis Aluminum Front Panel 5. 25 x 19 x 8 Inches 133 x 483 x 203 mm 12 lbs. [. . . ]