Dolby Laboratories CP650 Installation Manual download pdf (Page 74)

Dolby

Model CP650 Installation Manual B-Chain Alignment

4-22

Saving Changes.....

...

When the desired response for this channel has

been achieved, press the right-hand OK button to

save the settings.

L, R, and Ls, Rs

L, R, Ls, Bsl, Bsr, Rs

Press the left menu button once, then move the

front-panel knob to select the next channel to be

equalized. Repeat the above procedure for the

remaining full-range channels.

4.7.4 The EQ Assist Feature

Figure 4–4 EQ Assist Operating Range

The EQ Assist function automatically adjusts the B-chain EQ levels in 22 bands,

attempting to bring the spectrum of the audio in the auditorium in alignment with the

standard response curve. Course (bulk) EQ must be performed before activating

EQ Assist. (See Section 4.7.2.)

Activate EQ Assist by rotating the front-panel knob clockwise to move the blinking

cursor up to the 16 kHz band. Keep spinning the knob clockwise. When the cursor

stops blinking, EQ Assist is active and no further changes are allowed while it

operates. You will see the levels moving, and hear the audio in the auditorium

changing as the EQ Assist operates. When the cursor begins blinking again (after

approximately eight seconds) EQ Assist has finished.

It is important to note that the lowest three bands of the graphic equalizer (40, 50, and

63 Hz) and the uppermost two bands (12.5 and 16 kHz) will not be adjusted. This is

to protect the speakers against undesirable level boosts in those bands. Set these

bands manually then verify that the overall equalization is satisfactory.

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Dolby Laboratories CP650 Installation Manual Page 74