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Manafacture: DOD File size: 198.13 kb File name: Language of manual:

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. 4SR Series 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. DOD equalizers generate very little heat during operation and thus do not need to be specially ventilated or cooled. The units should not, however, be subjected to high temperatures for extended periods. Although the unit's chassis is shielded against radio frequency and electromagnetic interference, extremely high RF and EMI fields should be avoided. The XLR inputs and outputs are for balanced connections. Only the 1/4" phone plug inputs and outputs can be used for unbalanced connections. Use only one input/output connector pair at a time. Using more than one input/output connector pair at a time can unbalance balanced lines, cause phase cancellation, short a conductor to ground, or cause damage to other equipment connected to the equalizer. FOR BALANCED 1/4 “ TRS PHONE PLUG CONNECTION - Wire the connectors as follows: Phone Plug Connection tip : high ring : low sleeve : ground FOR 1/4" MONO PHONE PLUG CONNECTION: Phone plugConnection tip : high sleeve : ground XLR CONNECTORS - XLR type connectors are wired as follows: XLR Balanced Unbalanced Connector Connection Connection pin 1: ground ground pin 2: high high or hot pin 3: low ground Once the graphic equalizer has been installed and adjusted for the required equalization and level, an optional security panel can be installed to keep unauthorized persons from changing settings. SR Series APPLICATIONS DOD graphic equalizers can be used wherever modification of the frequency contour of a sound or sound system is needed. A graphic equalizer offers a solution to many common sound problems, both large and small. Also, creative experimentation on the part of the user can produce some nice results. SOUND REINFORCEMENT APPLICATIONS By routing the signal from the mixer to the SR Equalizer, and then to the main power amplifiers (or crossover), the overall frequency of the mix can be altered to do a number of things. A. Using a real time audio spectrum analyzer (such as DOD's SR Series RTA), a calibrated microphone, and a pink noise generator, the audio system can be tuned to make the overall audio spectrum response of the sound system and the room environment equal in frequency response...

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