McIntosh MC 502, Руководство пользователя

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Front Panel Controls and
How to Use Them
LEFT GAIN
Use the left gain control to adjust the volume in
the left channel to the desired listening level. Turn
the control clockwise to increase the volume.
RIGHT/MONO GAIN
Use the right/mono gain control to adjust the
volume in the right channel to the desired listening
level. Turn the control clockwise to increase the
volume. When the MC 502 is connected for mono-
phonic operation and the rear panel Mode Switch in
Mono the volume is controlled by the Right/Mono
Gain control only.
HEADPHONES
The output of the front panel HEADPHONE jack
has been designed to feed low impedance dynamic
stereo headphones. Plug dynamic headphones into
the front panel HEADPHONE jack. Adjust the front
panel LEFT GAIN and RIGHT/MONO GAIN control
for comfortable headphone listening. Electrostatic
headphones generally require higher power than
dynamic headphones. Connect them to the LEFT
and RIGHT OUTPUT contacts on the back of the MC
502.
SPEAKERS
OFF: The loudspeakers are turned off when the
SPEAKER switch is in the OFF position. You can
listen to headphones in private.
O N : M u s i c w i l l b e heard t h r o u g h t h e
loudspeakers. Use this as the normal listening posi-
tion.
THE SPEAKER SWITCH MUST BE IN THE "ON"
P O S I T I O N T O H E A R MUSIC F R O M T H E
LOUDSPEAKERS.
POWER
The power switch turns the MC 502 ON or OFF.
The switch does not control the power outlet on the
back panel. If you wish to control the AC power from
a preamplifier control center leave the switch in the
ON position. Be sure the AC cord of the MC 502 is
plugged into the controlled outlets on the rear of the
preamplifier control center.
OFF: In the OFF position the AC power to the
amplifier is turned off.
POWER GUARD INDICATOR LAMPS
POWER GUARD assures that the power amplifier
section of the MC 502 can not be over driven, thus
amplifier output clipping is eliminated. Clipping is
caused when the amplifier is asked to produce more
power output than it can deliver with low distortion.
Amplifiers are capable of delivering large quantities
of power when they are driven to clipping and can
have more than 40% harmonic distortion. The extra
energy content of the clipped signal will damage
most speakers. A Mclntosh advancement helps to
protect your speaker from this kind of damage. The
MC 502 has a built in "waveform comparator" that
compares the wave shape of the output signal to the
input signal. If the non-linearity between the two
signals exceeds 0.5% the POWER GUARD circuit
operates. Operation is indicated when the red LIMIT
indicators turn on. As long as the amplifier operates
without overload the NORMAL indicator illuminates.
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