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Table I. Using The Equalizer

CV Value

dB Value

255 224 192 160 128 96 64 32 0

+12 dB +9 dB +6 dB +3 dB 0 dB -3 dB -6dB -9 dB 12dB

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Sound Programming

Think of these CVs as slider control like those you might find on the front of an equalizer for your home stereo. Each CV may be programmed between 0 and 255. A value of 0 corresponds to full cut or -12dB*. A value of 128 corresponds to moving the slider to the middle or 0dB (no effect) and a value of 255 corresponds to full boost or +12dB. Table I shows CV settings for common boost/cut levels.

The graph below depicts the minimum and maximum frequency response for each of the seven CVs. Note that there is some overlap so adjusting one CV will raise or lower sounds with nearby frequencies as well.

255

CV Value

128

0

62

125

250

200

1K

2K

4K

The easiest way to set the EQ is to simply use your ears and adjust the CV settings while the sounds are playing. Starting with the lowest frequency band, adjust CV 154 up or down until you get the desired response. Then ad- just the next band using CV 155 and so forth. Depending on the speaker you have installed, you may find that the lowest frequency bands have or no little effect. In this case, the audio frequencies are out of the speaker’s reproduc- tion range and we suggest you set the corresponding CV to 0 (i.e., full cut).

*For those not familiar with dB, it stands for decibel. Every +6dB change represents a doubling in the audio signal while a -6dB change is the same as cutting it in half. Thus a +12dB increase quadruples the signal level and

  • -

    12dB cuts it in fourth.

Tsunami Steam Sound User’s Guide

Page 38

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