McIntosh MA 230 - SERVICS BULLETINS, Руководство пользователя

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If a phono cartridge requires less than
47,000 ohms load impedance, a resistor can
be added across the terminals of the car-
tridge to achieve the correct termination.
The following chart may be used as a guide:
Desired Impedance
47,000 ohms (47K)
37,000 ohms (37K)
27,000 ohms (27K)
15,000 ohms (15K)
6,800 ohms (6.8K)
Resistor Across Input
No Resistor
180,000 ohms (180K)
62,000 ohms (62K)
22,000 ohms (22K)
8,200 ohms (8.2K)
OPERATING INSTRUCTIONS
BALANCING A STEREO SYSTEM
The performance and enjoyment of a
stereo system is greatly increased when the
system is properly balanced. The balance of
a stereo system is affected by many things
including room acoustics, furniture place-
ment, room shape, small differences in loud-
speakers, and unequal program loudness.
The control marked BALANCE on the
MA230 can be used to perfectly balance all
factors for best listening.
1. Play a familiar recording on the record
player.
2. Turn the INPUT SELECTOR to the
PHONO position into which the record player
is connected.
3. Turn the BASS and TREBLE controls
so that the knob indicators are centered be-
tween the panel markings L and R.
4. Turn the BALANCE control to the cen-
ter or 12 o'clock position.
5. Place the LOUDNESS switch in the
NORMAL position.
6. Place the TAPE switch in the NORMAL
position.
7. Place the PHASE switch in the 0°
position.
8. Place the LF filter switch in the FLAT
position.
9. Place the HF filter switch in the FLAT
position.
10. Turn the MODE SELECTOR to the
L+R to L position.
11. While the program is playing, alter-
nate the MODE SELECTOR between the L+R
to R and the L+R to L positions. Adjust the
MA230 BALANCE control until the loud-
speaker volumes are equal.
The stereo system will now be balanced.
Different program material such as records,
tapes or FM broadcasts may require different
BALANCE control settings. It is not at all un-
usual for the BALANCE control to remain off
center one way or the other for correct bal-
ance. This means the BALANCE control is
performing the function it was designed for.
ADJUSTING PHASE
1. Set the MODE SELECTOR to STEREO.
2. Turn the BASS controls and TREBLE
controls to straight up position with the dial
indicators centered between the panel mark-
ings L and R.
3. Stand approximately 10 feet in front of
and midway between the loudspeakers. The
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