Akai Reference Master GX-75 - Page 21

The MPX (Multiplex) filter
When high frequency signals are over-emphasized during FM
stereo recording; use of a noise reduction system alone is not
enough.
In this case, it is necessary to use the MPX filter.
Set the MPX. FILTER switch to =
What is the MPxX filter?
FM stereo signals contain 19 kHz pilot signals and 38 kHz sub-
carrier signals which convey the left and right channel informa-
tion. These signals are necessary, but they must be removed
from the output signals of the tuner. If these signals are not re-
moved, they can affect the DOLBY NR system. The MPX filter is
designed to remove these pilot tone signals from the recording.
When to use the MPX FILTER switch
Use this switch only when recording with the DOLBY NR
system. Most high quality tuners have filters to suppress FM pi-
lot tone signals. With these tuners, you can leave the MPX FIL-
TER switch at sm . With other tuners, the MPX FILTER switch
should be set to .= . The MPX FILTER switch should also be
turned on when you have monitored the just recorded music
and feel that the sound quality is not right.
When the CD/DAT DIRECT switch is setto = , the MPX FIL-
TER switch is automatically defeated.
Tape Dubbing : Making a copy from
an original tape
For tape dubbing, normally connect both cassette decks to the.
amplifier. Refer to the amplifier’s operator's manual for opera-
tion details.
Itis also possible to connect directly, deck to deck. Set the re-
cording controls (noise reduction, recording level, etc.) exactly
as you would for standard recording.
The Auto stop and tape transport
mechanism —
Auto stop mechanism
This cassette deck is equipped with an auto stop mechanism
that automatically stops the tape when it has been fully fast for-
warded, fast rewound or at the end of playback or recording.
Tape transport mechanism
When the power of the cassette deck is turned on, the capstans
rotate in order to stabilize tape transportation during’ the record-
ing and playback modes.
The auto tape selector .
How the tape positions are detected
Cassette tapes can be separated widely into three types:
Normal position, chrome (CrO2) position and metal position.
Tape performances differ according to tape position and to fully
utilize the performance of each tape, the cassette deck’s re-
cording/playback characteristics such as bias and equaliza-
tion must be set to suit each tape position.
This cassette deck is equipped with an auto tape selector which
functions automatically after you have loaded a cassette tape.
Once loaded, the metal, CrO2 or normal tape position is indicat-
ed on the FL display.
How the Auto Tape Selector operates
When a cassette tape is loaded, the cassette deck detects the
tape position by sensing the tape position notches located on
top of the cassette case, as illustrated.
Recording defeat tab
Normal position
CrO2 position
Meta! position
Mikes dai ed
Notch
Note
@ Donotuse a cassette tape which does not have notches for
triggering the tape position, as this will result in recordings of
poor quality. :
@ We do not recommend the use of ferri-chrome cassette
tapes for recording.
Standard reference tapes of the cassette
deck
C-60 (60 minutes) tapes are the standard reference tapes.
Normally, set the BIAS and LEVEL CALIBRATION controls
to “0” when using one of the standard reference tapes listed.
Metal TDK MA
| CrO2 (Chrome) TDK SA
Normal Maxell