Equalizer Controls - McIntosh 168255 Owner's Manual

the Remote Control, the BLUE (Setup) Push-button
followed by pressing the OUTPUT 2 Push-button to
switch On or Off the external Power Amplifier.
Passthru
When the MA9000 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 Processor or
Surround Decoder is turned On. It will indicate on the
Front Panel Display "PASSTHRU". Refer to figure 75.
PASSTHRU
Figure 75
The MA9000 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 MA9000 Equalizer has eight 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 25Hz, 50Hz, 100Hz, 200Hz,
400Hz, 1,000Hz, 2,500Hz and 10,000Hz. Both Left
and Right Channels are affected. At the center detent
or flat position of the controls, the tone circuit compo-
nents 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 MA9000 at the +6dB and -6dB points.
Fundamental Frequencies of Acoustical Musical Instruments and the Human Voice
LARGE
25Hz 100Hz
50Hz
How to Operate the MA9000, 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
400Hz
200Hz
1kHz
SINGING VOICE
PICCOLO
FLUTE
B CLARINET WOODWINDS
BRASS
HARP
VIOLIN
STRINGS
PIANO
2.5kHz
10kHz
29