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Resumen del manual
Frequency Band Slider Controls: Each one of these slider potentiometers will boost or cut at its noted frequency by ±6dB or ±12dB, depending upon the position of the BOOST/CUT RANGE switch. When all the sliders are in the center detented position the output of the equalizer is flat. The frequency band centers of the 131 and 231 are marked at 1/3rd of an octave intervals on ISO standard spacings, while the frequency band centers of the 215 are marked at 2/3rds of an octave intervals on ISO standard spacings. Low Cut Enable Switch: The LOW-CUT switch inserts or removes the 18dB/octave 40Hz low-cut filter from the signal path. When the LOW-CUT switch is pushed in, the LOW-CUT filter is IN the audio path. User Manual 2-Series CONNECTING THE EQ TO YOUR SYSTEM The 2-Series Equalizers have balanced inputs and impedance balanced outputs that can be used with any balanced or unbalanced line-level device. To connect the equalizer to your sound system refer to the following steps: • Turn off all equipment before making connections. • Mount equalizer in a standard-width rack. Install the EQ in a rack with the rack screws provided. It can be mounted above or below anything that does not generate excessive heat. Ambient temperatures should not exceed 113° F (45°C) when equipment is in use. Although the unit’s chassis is shielded against radio frequency and electromagnetic interference, extremely high fields of RF and EMI should be avoided. • Make audio connections via XLR or 1/4" TRS jacks (according to application needs). Both types of connectors for the inputs and outputs can be used for balanced or unbalanced connections. The use of more than one connector at a time for the inputs could unbalance balanced lines, cause phase cancellation, short a conductor to ground, or cause damage to other equipment connected to the equalizer. More than one output may be used simultaneously as long as the combined parallel load is greater than 2k.. • Select the operating range with the BOOST/CUT RANGE SELECTION switch. Note: Be sure to reduce audio levels at the power amplifiers when changing the setting of this switch as it may generate an audible transient. • Apply power to the equalizer. Connect the AC power cord to the AC power receptacle on the back of the equalizer. Route the AC power cord to a convenient power outlet away from audio lines. The unit may be turned on and off from the rear panel power switch or a master equipment power switch (231 only). Since the 2-Series Equalizers consume a relatively small amount of power, the units may be left on continuously. REAR PANEL DESCRIPTIONS Rear Panels 131- Single Channel 31 Band Graphic EQ 215- Dual Channel 15 Band Graphic EQ User Manual 2-Series 231- Dual Channel 31 Band Graphic EQ Power Switch (231 only): Switches the power on and off. Always make audio connections with the power switch in the OFF position. Power Cord Receptacle: Connects AC power to the equalizer. Output Connectors: Two types of output connectors are provided for output connections: male XLR type connectors, and 1/4" tip-ring-sleeve phone jack connectors. Input Connectors: Two types of input connectors are provided for input connections: female locking XLR type connectors, and 1/4" tip-ring-sleeve phone jack connectors. The maximum input level that the equalizer can accept is +22dBu (ref: 0.775Vrms). INSTALLATION CONSIDERATIONS Hookups and Cabling: The 2-Series Equalizers are designed for nominal +4dBu levels. The equalizers can be used with either balanced or unbalanced sources, and the outputs can be used with either balanced or unbalanced loads, provided the proper cabling is used. A balanced line is defined as two-conductor shielded cable with the two center conductors carrying the same signal but of opposite polarity when referenced to ground. An unbalanced line is generally a single-conductor shielded cable with the center conductor carrying the signal and the shield at ground potential. Input Cable Configurations: The equalizer has an input impedance of 40k. balanced and 20k. unbalanced. This makes the 2-Series Equalizers’ audio inputs suitable for use with virtually any low source impedance (under 2k.). Output Cable Configurations: The equalizer’s output is capable of driving a 2k. load to +18dBu. For maximum hum rejection with a balanced source, avoid common grounding at the equalizer’s inputs and outputs. Most balanced (3-conductor) cables have the shield connected at both ends. This can result in ground loops which cause hum. If hum persists try disconnecting the shield on one or more of the cables in the system, preferably at the input of a device, not at the output. OPERATION AND APPLICATION NOTES The dbx 2-Series Graphic Equalizers are useful audio signal processing tools in situations where precise frequency control is required across the audible frequency spectrum. When used with an audio spectrum analyzer the EQs can tune any acoustical environment -- from the studio to the concert hall -- to s...
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