Connecting the EQ to Your System

12 SERIES GRAPHIC EQUALIZERS

OPERATION MANUAL

Input Gain Control: This control sets the signal level to the equalizer. It is capable of -12dB to +12dB of gain. Its effect is apparent by viewing the OUTPUT LEVEL BAR GRAPH.

EQ Bypass: This switch removes the graphic equalizer section from the signal path. (See Block diagram on Page 8.) The BYPASS switch does not, however, affect the INPUT GAIN, or LOW CUT filters.

EQ Bypass LED: This red LED lights when the EQ is in bypass mode. Note that bypass mode only effects the graphic equalizer section of the 12 Series EQs. The INPUT GAIN and and LOW CUT controls remain unaffected when the EQ is bypassed.

Boost/Cut Range Selection Switch and LEDs: This switch selects which of the two boost/cut ranges the equalizer will use, either ±6dB or ±15dB. The red LED lights when the ±15dB range is selected, and the yellow LED lights when the ±6dB range is selected. Note that the BOOST/CUT switch is slightly recessed. This is to prevent acciden- tal activation of the switch, possibly causing damage to other sound system components.

Output Level Bar Graph: These four LEDs indicate output level of the equalizer. The red LED is 3dB below clip- ping and is marked as +18dBu. It monitors the level at the output of the equalizer after all other processing.

Clip LED: This LED lights whenever any internal signal level reaches 3dB below clipping which may occur when

any of the following happen: 1) the input signal is “hotter” than +22dBu, 2) excessive gain is applied by the input gain control, or 3) excessive boost is applied using the frequency sliders.

Frequency Band Slider Controls: Each one of these slider potentiometers will boost or cut at its noted frequency by ±6dB or ±15dB, 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 1231 are marked at 1/3rd of an octave intervals on ISO standard spacings, while the frequency band centers of the 1215 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 Bessel low-cut filter from the signal path. When the LOW-CUT switch is pushed in, the LOW-CUT filter is IN the audio path.

The 12 Series Equalizers have balanced inputs and outputs that can be used with any balanced or unbalanced line- level device. For more specific information about cabling possibilities, please refer to the section entitled Installation Considerations, Page 5.

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 EQs 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, barrier strip, or 1/4" TRS jacks (according to application needs) All three 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 cancel-

lation, 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 600 .

• 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

12 Series specifications

The dbx Pro 12 Series is a versatile line of professional audio processing equipment, celebrated for its high-quality performance and innovative features designed for studio and live sound applications. The 12 Series encompasses a range of products, including dynamic processors, equalizers, and crossovers, providing users with the tools they need to achieve exceptional sound quality.

One of the standout features of the dbx Pro 12 Series is its advanced digital signal processing (DSP) technology. This allows for precise control and manipulation of audio signals, ensuring that users can tailor their sound to meet specific needs. The DSP also enables features like adaptive filters and real-time analysis, making it easier for sound engineers to achieve the perfect mix.

The 12 Series products often include the iconic dbx OverEasy compression technology, which delivers smooth, musical compression without unwanted artifacts. This feature is particularly useful for vocal tracks and instruments, making it a favorite among producers and live sound engineers alike. Additionally, the series offers various dynamic processing options, including gating and expansion, providing users with even more tools to shape their sound.

Another noteworthy characteristic of the dbx Pro 12 Series is its user-friendly interface. Many models feature intuitive controls and clear LCD displays that allow for easy navigation and adjustment of settings. This accessibility ensures that both experienced professionals and newcomers to audio processing can effectively utilize the equipment.

Furthermore, the build quality of the dbx Pro 12 Series is robust and reliable. Designed for the rigors of live performance and studio work, these devices are constructed with durable components that can withstand considerable use and environmental factors. Rack-mountable designs make it easy to integrate them into existing setups.

Connectivity options are also extensive, with most models featuring balanced XLR and TRS inputs and outputs, making them compatible with various audio systems. Advanced models may include digital connectivity options, ensuring that they can integrate seamlessly into modern digital audio workstations.

In summary, the dbx Pro 12 Series is a powerful line of audio processing equipment that combines professional-grade performance with user-friendly features. With its innovative DSP technology, OverEasy compression, and durable build quality, it stands as a reliable choice for audio professionals in both live and studio settings. The versatility and flexibility of the 12 Series make it an invaluable addition to any sound engineer's toolkit.