Passthru And Equalizer Controls - McIntosh MA7900 Owner's Manual

the Front Panel OUTPUT 2 Push-button or press on
the Remote Control the 2nd Push-button followed by
pressing the OUTPUT 2 Push-button to switch On or
Off the external Power Amplifier.
Passthru
When the MA7900 is connected together with a Mc-
Intosh Multichannel A/V Control Center or Surround
Decoder and has the PASSTHRU Mode activated, it
will automatically turn-on when the A/V Control Cen-
ter or Surround Decoder is turned On. It will indicate
on the Front Panel Display "PASSTHRU". Refer to
figure 73.
PASSTHRU
Figure 73
The MA7900 OUTPUT 1 / OUTPUT 2 Front Panel
Push-buttons are active when in the Passthru Mode.
The other Front Panel Controls and Push-buttons are
deactivated as long as the Passthru Mode is active.
Equalizer Controls
The MA7900 Equalizer has five Frequency Controls
which will raise or lower by 12dB, the amplitude of
the band of frequencies centered at the frequency
marked above the controls. The center frequencies of
these controls are at 30Hz, 125Hz, 500Hz, 2,000Hz
and 10,000Hz. Both Left and Right Channels are
affected. At the center detent or flat position of the
controls, the tone circuit components are removed
from the signal path.
The illustration to the right shows the fundamental
frequency range of acoustical musical instruments and
the human voice. It also shows the range of adjustment
of frequencies for each of the Equalizer Controls of
the MA7900 at the +6dB and -6dB points.
Fundamental Frequencies of Acoustical Musical Instruments and the Human Voice
LARGE
30Hz
125Hz
How to Operate the MA7900, con't
SOPRANO
CONTRALTO
TENOR
BARITONE
BASS
OBOE
ENGLISH HORN
BASS CLARINET
ALTO SAXOPHONE IN B
BASSOON
CONTRABASSOON
B TRUMPET
FRENCH HORN IN F
TENOR TROMBONE
BASS TROMBONE IN F
TUBA
SMALL
MEDIUM KETTLE DRUMS
GUITAR
VIOLA
CELLO
BASS
500Hz
SINGING VOICE
PICCOLO
FLUTE
B CLARINET WOODWINDS
BRASS
HARP
VIOLIN
STRINGS
PIANO
10kHz
2kHz
29