Yamaha 150 Manual Do Utilizador

■ Rear Panel

Ω

Ω

5

6

1

3

4

2

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.

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.

• 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.

1

2

3

Cold

Ground

Hot