User Guide

3
system gain is increased. These bands with excess energy will brightly illuminate the corresponding
led above the offending frequency’s fader. These frequencies will generally be the first where
feedback is likely to occur.
FDC can also be employed as a simple spectrum analyzer along with its primary use with the
equalizer. This will allow you to identify “hot” spots – area of potential feedback – and attenuate
accordingly before feedback occurs.
Of course, during a musical performance, FDC will help you quickly locate and eliminate feedback if it
occurs.
Be careful when running a sound system close to its feedback limit. Feedback can damage
equipment as well as hearing.
FDC SYSTEM PRECISION
The HQ EQ circuitry is extremely precise. The equalizer features Constant-Q Filtering, which helps
the HQ’s FDC work with great efficiency. When feedback occurs at a certain band, the ensuing
attenuation will not affect surrounding bands. This precision is, of course, critical for professional
applications.
INSTALLATION
These equalizers are designed for mounting in a standard 19” equipment rack or one of the many
rack type portable cases available on the market. The vertical measurements are 3.2 inches. Both
models are 8.5 inches in depth.
POWER CONNECTORS
This series of graphic equalizers have internal power supplies and are designed for operation from
120-240 volt, 50-60Hz mains supply. Power consumption is 20 watts. In new installations and
portable sound systems, or any situation in which the mains power is in question, it is wise to confirm
the voltage and select the appropriate line voltage switch BEFORE connecting the equalizer to power
sources.
INPUT/OUTPUT CONNECTIONS
This series of graphic equalizers have 3 sets input output connectors wired in parallel: XLR, 1/4"
phone, and RCA phono connectors.