Names and functions of parts, Power switch (power) and indicator, Headphone jack (phones) – Yamaha A100 User Manual
Page 6: Ou^ut level controls (output level), Output level meters, Clipping indicators (clip)
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NAMES AND FUNCTIONS OF PARTS
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Power switch (POWER) and indicator
When the switch is in the ON position the POWER indicator and level
meter lamp light. No sound is heard from the speakers for a few seconds after
the power is turned on while the protection circuitry is operating.
Headphone jack (PHONES)
To monitor amplifier output, plug stereo headphones into this jack. Output to the
speakers is cut off when headphones are plugged into the jack.
* If the MODE switch (on the rear panel) is set to MONO, inverted phase sound
will be heard from headphones plugged into the PHONES jack. Do not use
headphones with the A100 with the MODE switch set to MONO.
Ou^ut level controls (OUTPUT LEVEL)
Use*this knobs to adjust the level of the input (output) signal. Turn towards the
"10" indication to increase the level.
* In a monaural (BTL) configuration, the level is controlled using the channel A
knob.
* You can usually leave the knobs in the "10" position and use the mixer or
preamplifier volume control to adjust the volume.
Output level meters
These VU type level meters display the output level. The meters are calibrated to
display both the output wattage with a speaker impedance of 8 Ohm and the
output level in decibels. (OdB shows 25W into 8 Ohm)
In case of MONO-operation both meters show the same output level.
Clipping indicators (CLIP)
These indicators light if the input level is excessive or if the speaker impedance
drops too low.