McIntosh MA 230 - SERVICS BULLETINS, Owner'S Manual

Page: 17 / 24

source of sound should appear to be directly
in front of you. Alternate the PHASE switch
between 0° and 180°. If the sound is not di-
rectly in front of you in the 0° position, re-
verse the leads to one loudspeaker. The
PHASE switch is used to correct phase in the
source material whenever necessary.
ADJUSTING FOR SPECIAL EFFECTS
HF FILTER
If you wish to reproduce badly worn
records, you can minimize the surface noise
by switching the HF filter to the FILTER posi-
tion.
LF FILTER
If you are using a turntable or changer
which has low-frequency rumble noise, you
may reduce it by pushing the LF filter switch
to the FILTER position.
BASS CONTROLS AND TREBLE CONTROLS
The tone balance which you hear when
listening to an orchestra is affected by the
conductor's instructions to his musicians,
the acoustical environment in which you are
listening, and your own subjective hearing
interpretation. Considering these conditions,
it is easy to see why tone balance controls
play a major role in correcting for the follow-
ing factors:
1. Each person's subjective idea of tone
balance.
2. Loudspeaker frequency response char-
acteristics.
3. Loudspeaker placement in the listen-
ing room.
4. The conductor's idea of tone balance
at the time the recording was made.
5. The microphone frequency response
characteristics.
6. The recording process influences.
These factors can be considered as en-
vironmental influences. The BASS CON-
TROLS and TREBLE CONTROLS provide a
degree of compensation for effects of en-
vironment. Listen to your system with each
control set with the indicators centered be-
tween the panel markings L and R. If you
wish to reduce treble in relation to bass for
example, turn the TREBLE CONTROLS coun-
terclockwise until the tone balance sounds
correct to you. These controls will modify
tone balance without introducing any unde-
sirable effects. Do not be surprised if you
find your preference in tone changing from
time to time.
PHASE
If the stereo sound seems to come from
either side of the room instead of being dis-
tributed between the loudspeakers, turn the
PHASE switch to 180°. This listening effect
is due to reproducing sound that is out of
phase from one channel to the other. You
will find some records and tapes may differ
from others in this respect.
LISTENING TO A STEREO TUNER
1. Turn the INPUT SELECTOR to TUNER.
2. Turn the MODE SELECTOR to STEREO.
3. Set the PHASE switch to 0°.
4. Set the HF cutoff filter switch to FLAT.
(See page 15 ADJUSTING FOR SPECIAL
EFFECTS.)
5. Set the LF filter switch to FLAT. (See
page 15 ADJUSTING FOR SPECIAL EFFECTS.)
6. Set the LOUDNESS switch to NORMAL.
(See page 15 ADJUSTING FOR SPECIAL
EFFECTS.)
7. Turn the BASS CONTROLS and TREBLE
CONTROLS so that the indicators are cen-
tered between the panel markings L and R.
(See page 15 BASS AND TREBLE CON-
TROLS.)
8. Set the TAPE switch to NORMAL.
9. Adjust the VOLUME control to the de-
sired volume.
10. Adjust the BALANCE control if neces-
sary.
After a warm up of about 30 seconds, turn
the tuning knob on your tuner to find the
station of your choice.
LISTENING TO A STEREO RECORD
To listen to stereo records, proceed as
follows:
1. Turn the INPUT SELECTOR to PHONO
1 or PHONO 2, whichever is connected to the
cartridge you wish to hear.
2. Set the MODE SELECTOR to STEREO.
3. Set the PHASE switch to 0°.
4. Set the HF cutoff filter switch to FLAT.
15