User manual DOD SREQ

[. . . ] SR Series Equalizers Owner's Manual · SR 231QX · SR 430QX · SR 431QX · SR 830QX · SR 831QX A Harman International Company Warning For your protection, please read the following: Water and Moisture: Appliances should not be used near water (e. g. near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool, etc. ) Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through openings. These symbols are internationally accepted symbols that warn of potential hazards with electrical products. The lightning flash means that there are dangerous voltages present within the unit. The exclamation point indicates that it is necessary for the user to refer to the owners manual. These symbols warn that there are no user serviceable parts inside the unit. [. . . ] Connection to the equalizer may be either balanced with an XLR connector or with optional unbalanced 1/4" phone plug making the units readily interfaceable to any system. Dual channel units may be used as a stereo equalizer or as two independent equalizers. The units offer either 1/3rd octave or 2/3rds octave resolution, depending on the unit chosen. All DOD equalizers are solidly built with steel chassis and CSA standard circuit boards for years of reliable service. WHY A 1/3RD OCTAVE OR A 2/3RD OCTAVE EQUALIZER?Most graphic equalizers divide up the audio frequency range into 1/3rd octave or 2/3rds octave pieces. One octave covers a 2-to-1 range of frequencies. For example, the frequency range form 50 to 100 Hertz is one octave. The audio frequency range covers 10 octaves from 20 Hz to 20 kilo (thousand) Hz. If each of the ten octaves is divided into thirds, you get 30 pieces, or bands, of frequency. (The 31 bands on DOD equalizers result from including both 20 Hz and 20 kHz bands on the ends of the audio frequency range). A 1/3 octave equalizer means that 3 bands span 1 octave, while a 2/3 octave equalizer means that 3 bands span 2 octaves. Therefore, one band on a 2/3 octave equalizer is twice as wide as one band on a 1/3 octave equalizer. So, boosting or cutting any band will affect a wider range of frequencies on the 2/3 octave equalizer. A 1/3rd octave equalizer is the most precise because you're working with a narrower frequency range per band or slider on the equalizer. To cover the entire audio range, you need 31 bands or sliders, which normally take up the entire width of a rack panel, and take some time to adjust properly. A high-resolution real time audio spectrum analyzer (such as DOD's SR Series RTA ) is a very useful tool when setting up a 1/3rd octave graphic equalizer to compensate for poor room acoustics, poor speaker response, or the deficiencies of an audio system. While the 2/3rds octave is not as precise as a 1/3rd, it takes far less time to equalize a signal with this unit, and allows more channels of EQ to be reached. The 2/3rds octave EQ allows you to quickly and easily modify a sound for use in music, recording, or sound reinforcement. 3 4 SR Series EQ's DOD graphic equalizers offer both 1/3rd and 2/3rds octave models in stereo and 1/3 octave models in mono to meet any need. INSTALLATION Install the equalizer in a rack with the provided rack screws. Route the AC power cord to a convenient power outlet away from audio lines. The unit may be turned on and off using the front panel power switch. Since the units draw a relatively small amount of current during idle, they can be left on continuously. [. . . ] A 1/4" TRS jack may be used to achieve an impedance balanced output. Maximum balanced output level is +21 dBu. UNBALANCED OUTPUT: Accepts a 1/4" plug (see section on installation for wiring connections). Maximum unbalanced output level is +21 dBu. [. . . ]