12 SERIES GRAPHIC EQUALIZERS | OPERATION MANUAL |
Wiring Connections With Ground
Without Jumper in Place | With Jumper in Place |
circuit chassis ground ground
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InputOutput
Cable Cable
circuit chassis ground ground
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jumper
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INSTALLATION CONSIDERATIONS
Hookups and Cabling: The 12 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
Input Cable Configurations: The equalizer has an input impedance of 40k balanced and 20k unbalanced. This makes the 12 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 600 load to +18dBu. For maximum hum rejection with a balanced source, avoid common grounding at the equalizer’s inputs and outputs. Most bal- anced
OPERATION AND APPLICATION NOTES
The dbx 12 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
Insert the graphic equalizer between the signal source (usually a mixer) and the power amplifiers (or the crossover if there is one). Adjust the level and equalization as required to yield the desired system response. The long throw faders of the EQs allow very precise settings of the equalization for accurate equalization curves.
For optimum
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