Rear Panel - Yamaha 150 Owner's Manual

Rear Panel

1
FILTER
CHANNEL B
LOW CUT
40Hz
OFF 80Hz
HIGH CUT
5kHz
OFF 10kHz
INPUT
CHANNEL B
1
FILTER switches (CHANNEL A, B)
Independent low-cut/high-cut filters are provided for
channels A and B. These filters allow you to change
cut-off frequencies.
• LOW CUT switch
80Hz ...... Cuts the frequency range of 80 Hz by
12 dB/octave.
Normally, use at this position.
40Hz ...... Cuts the frequency range of 40 Hz by
12 dB/octave.
Only use this position if you have verified
that the speaker transformer you will use
secures an adequate low-frequency charac-
teristic.
OFF ....... Turns the low-cut filter off.
Only use this position if you have verified
that the signal input to the power amp has its
low frequencies cut.
Note: If low frequency is applied to the power amp,
the speakers, speaker transformers, and amp may be
damaged by speaker transformer core saturation.
• HIGH CUT switch
10kHz .... Cuts the frequency range of 10 kHz by
6 dB/octave.
5kHz ...... Cuts the frequency range of 5 kHz by 6 dB/
octave.
OFF ....... Turns the high-cut filter off.
2
CHANNEL A
LOW CUT
15
20 20
40Hz
OFF 80Hz
10
25 25
6
30 30
3
40 40
00 0 00
–dB –dB
CHANNEL B CHANNEL A
OUTPUT VOLTAGE
HIGH CUT
5kHz
OFF 10kHz 70V 100V
CHANNEL A CHANNEL B
+ –
5
LOW CUT
40Hz
OFF 80Hz
HIGH CUT
5kHz
OFF 10kHz
3
15
10
6
3
0
INPUT
CHANNEL A
+ –
G G
2
Volume controls (CHANNEL A, B)
These knobs enable you to adjust the output level of
Channels A and B in the range between – dB and
0 dB.
3
OUTPUT VOLTAGE switch
This switch toggles between 100 V and 70 V voltage
line.
4
SPEAKERS terminals (CHANNEL A, B)
Barrier strip terminals are available. They are wired as
follows:
Hot (+), Cold (-)
Refer to "Connecting speakers" on page 6 for more
information on the impedance of the speaker systems
you can connect here.
5
INPUT terminals (CHANNEL A, B)
Two types of balanced terminals for channels A and B
are provided.
• XLR-3-31 type connector
They are wired as
follows (IEC 60268):
Pin 1–ground
Pin 2–hot (+)
Pin 3–cold (-)
• Barrier strip
Hot (+), Cold (-) and Ground (G).
6
GND terminals
This is the grounding screw terminal. If hum or noise
occurs, ground (earth) the unit via this jack, or try
connecting it to the chassis of the mixer or preamp,
etc.
4
SPEAKERS
CHANNEL B CHANNEL A
– + + –
70V = 32 /CHANNEL
100V = 64 /CHANNEL
6
Hot
2
Ground
1
3
Cold
5