Audio Database


Marantz SD-64 74,800yen(around the 1984 time)

The cassette deck which carries various functionalities and a noise reduction system in order to correspond to a digital audio.

The automatic-reversing functionality by the infrared photosensor and a rotary head is carried.
The difference of the reflection factor of the magnetic-substance fraction of a tapes and a reader fraction is detected, a rotary head rotates immediately, and an infrared photosensor performs a reverse operation.
A rotary head does not have a tone-quality difference in order to carry out the Recording play of the both-way bothways with the same head, and azimuth adjustment is possible for it in bothways.

In the mechanism, microcomputer +3 only for 2 K bytes motor (it is one motor each the object for capstans, the object for reels, and for a head migration) was carried, and the operation which was trustworthy and was stabilized is realized in it.

The large-sized fly wheel was adopted and the smooth rotation has been obtained.

The back tension dynamically stabilized by the dynamic stability tension system of the newly developed tension organization which employed new-materials Lu Ron is maintained.

In order to banish the variation in the run performance in the round trip which poses a problem on the reverse deck, the double dummy head is carried.
Each sides of the rotary head were equipped with the dummy head, and the tapes run which kept the tapes location exact and was stabilized is attained.

The audio circuitry has DC composition made into only two coupling capacitors from the input to the output, and DC stream composition of a head hardwired connection is raising the phase response.
Moreover, logic circuitries, such as an audio system and each window control, and a power circuit are made to separate, influence is suppressed, and the tone quality is raised.

Dolbey B/C and dbx are carried in the noise reduction system.

The synchro recording functionality is carried and a sound-recording start can be controlled at the player start of a play equipment by combining with the equipments (compact-disk-84 etc.) equipped with the synchro recording termination.

The blank search function is carried, the head of the unrecorded fraction of a recorded tape is found, and from there to about 3-minute after, after play checking, a sound-recording standby (REC/PAUSE) is returned and carried out to the head of a unrecorded part.

If the quick rewind functionality is carried and a hoist back-out switch is pushed after a sound recording, it will return to the location which started the sound recording, and a play standby (Play/Pause) will be carried out automatically.

The unrecorded fraction for 4 seconds is made from one-touch, and the auto REC-Mute functionality which carries out a sound-recording standby automatically is carried.

The QMS (quick music sensor) functionality in which transfer song selection of 20 music is possible is carried approximately.

The index scan functionality which reproduces the head fraction of each music for 10 seconds at a time is carried.

The memory functionality is carried, a tapes location is memorized by memory switchpoint operation, and a stop and a play can be performed in the location.

By pushing a play switchpoint twice, an one music repeat play is possible.

Independent equipment of the volume which can control an output output and a headphone output is carried out.

The large-sized display device consisting mainly of a peek hold level meter and 4way digital counter is carried.

The Marantz bus system is carried and a remote control etc. becomes possible by the interconnection with a balance bus system loading model.

Rating of a mode
Form Digital monitor cassette deck
Track form Four two track stereo
Head Recording-play head
Erase head
Motor Capstan motor
Reel motor
Mechanism drive motor
Wow and flutter 0.028%(WRMS)
±0.05%W-Peak (EIAJ)
Frequency characteristic 20Hz - 18kHz (metal)
20Hz - 17khz (chromium)
20Hz - 16kHz (normal)
S/N ratio 54dB (EIAJ, peek recording-level auditory sensation weighting)
At the time of Dolbey B NR ON: 10dB modification (5kHz or more)
At the time of Dolbey C NR ON: 20dB modification (1kHz - 10kHz)
At the time of dbx NR ON: 30dB modification (1kHz)
Input sensitivity/impedance Line: 70mV / 50kohm
An Output voltage/impedance Line: 0.7V/2kohm
Headphone: 0.7W/8 ohm
Power source AC100V, 50Hz/60Hz
Power consumption 30W
Dimensions Width 416x height 118x depth of 334mm
Weight 6.5kg