Marantz SD630
¥ 75,000 (around 1983)
Commentary
Click auto reverse cassette deck in pursuit of multifunctionality.
It uses a rotary head that solves problems such as differences in sound quality and azimuth adjustment during round-trip operations, and an infrared sensor that detects the tape leader, enabling quick reverse operation.
By operating the reverse mode selector, it is possible to record and play back in both directions or one way without turning over the tape.
The noise reduction system is equipped with dbx and DolbyC B.
Dbx reduces noise by more than 30 dB over the entire audible frequency range and provides high quality sound without distortion even at high recording levels.
It also has a dbx disc position that allows you to play a dbx encoded disc, which is dbx-encoded at the time of cutting and decoded at the time of playback for a low-noise, high-dynamic-range sound.
In order to realize excellent operability, it is equipped with 2 kbyte electric circuit exclusive microcomputer and 1 kbyte mechanism drive exclusive microcomputer, and in addition, independent motors for capstan, reel, and head movement are installed.
Equipped with a tape slack prevention mechanism that automatically takes up the slack when the tape is attached and prevents recording errors.
It is equipped with an index scanning function that plays the head part of a song for about 10 seconds, then automatically fast-forwards to the next song and plays again for 10 seconds.
Equipped with a Quick Music Sensor (QMS) that can automatically select 31 tracks before and after.
Equipped with an auto-rec mute function that creates a 4-second non-recording portion with one touch and automatically enters the recording standby state.
One or all songs can be played repeatedly.
Equipped with a timer standby switch that can be used in combination with an audio timer to record your absence or play an alarm clock.
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Model Rating
| Type | Digital monitor and cassette deck |
| Truck type | 4-track 2-channel stereo |
| Recording system | AC bias system |
| Heads | One recording and playback head Erase Head x1 |
| Motor | Capstan motor x1 Reel motor x1 1 Mechanism Drive Motor |
| Wow and flutter | 0.04%(WRMS) ± 0.09% W · Peak (EIAJ) |
| Frequency characteristic | 20 Hz ~ 18 kHz ± 3 dB (Metal Tape) |
| Signal-to-noise ratio | 54 dB (EIAJ / peak recording level audibility correction) 84dB(dbx on) 74dB(Dolby C on) 64dB(Dolby B on) |
| Input Sensitivity / Impedance | Line : 70mV/50k Ω Microphone : 0.3mV/600 Ω |
| Output Level / Impedance | Line : 0.5V/3k Ω Headphone : 0.4mW/8 Ω |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 20W |
| Maximum external dimensions | Width 416x Height 108x Depth 310 mm |
| Weight | 4.5kg |
| Attachment | 2 RCA pin cords for audio stereo |