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STA-800D/1000D Equipped Subs
Setup & Use of PEQ
Advanced Features: Parametric Equalizer (PEQ)
Important Note: Until you are ready to use the PEQ feature set, it should be disabled and setting the Level
in both PEQ1 and PEQ2 to 0. See the discussion above on the Integrated Function Controller for instructions
on how to Disable and set the PEQ Level, as well as selecting the Frequency and Q values.
Background Information: Direct and reflected bass waves in the listening room will create “standing waves”
and associated peaks and nulls in the subwoofer frequency response (FR). The PEQ allows you to reduce
the severity of a peak in the subwoofer frequency response up to -12 dB, and to boost a dip in frequency
response up to + 3dB, thus obtaining a more accurate sound. The STA-800D/STA-1000D Sledge™ amplifier
in your subwoofer contains two PEQ filters labeled PEQ1 and PEQ2 so you can implement one (STA-800D) or
two (STA-1000D) different sets of cut or boost.
Control Explanation: The PEQ has three controls: Frequency, Bandwidth, and Level.
The Frequency control (labeled “FREQ:” ) selects the center frequency where the PEQ cut will take effect,
and has several discrete frequencies to choose from. These include: 31, 35, 40, 46, 50, 56, 63, 70, 80, 90,
100, 112 and 125 Hz.
The Bandwidth control (labeled “Q:”) affects the width of the PEQ cut or boost. The higher the Q value, the
narrower the bandwidth of the cut/boost and conversely, the lower the Q value the wider the bandwidth
of the cut or boost. In most cases, it is best to start with a high Q setting (narrow bandwidth) and widen out
(lower Q) as the results are observed. To better understand the relationship between Q values and octave
bandwidth, browse the following link:
http://www.sengpielaudio.com/calculator-bandwidth.htm
The following table summarizes bandwidth of the Q settings in the STA-800D/STA-1000D Sledge™ amplifier:
27
FIG. 12