AKAI 4000DS

Commentary

This tape deck was developed as a basic model of the 4000 series.

The head section uses a 3-head system, and by using a dedicated head for erasing, recording, and playback, it realizes high-performance recording and playback as well as simultaneous monitoring during recording.
A 1 μ gap head has been adopted for the head, and excellent characteristics are ensured by providing a gap of 1/1000 mm ultra-precision processing.

The drive motor is equipped with a 4-pole induction motor and combined with a large flywheel to achieve stable tape travel.

Equipped with a tape selector.
This circuit changes the recording compensation characteristics so that the performance of a low-noise tape can be brought out.

Equipped with sound on sound function.
With this function, you can record multiple recordings by transferring the recordings previously recorded on one track to other tracks and superimposing multiple recordings on each other.

The line and microphone inputs are designed independently for mixing recording and sound with DIN input for sound with sound mixed with line input.

Equipped with a temporary stop mechanism, tape travel can be stopped temporarily while recording / regenerating condition.

Equipped with an automatic shut-off mechanism. When the tape reaches a wound or cut position, the power of the whole unit is turned off by the shut-off switch.

Uses a 2-lever operation mechanism.

Equipped with a VU meter.
This meter is linked with a monitor switch and automatically changes to the input level and playback level of the program source.

Equipped with a 4-digit index counter.

Model Rating

Type	Tape deck
Track system	4-track 2-channel stereo / monaural system
Reel	No. 7
Tape speed	19cm/s, 9.5cm/s (± 2%)
Wow and flutter	19cm/s : 0.15% Wrms or less 9.5cm/s : 0.2% Wrms or less
Recording (playback) compensation characteristics	NAB characteristics
Frequency characteristic	When using AKAI S. R. T. tape 30 Hz ~ 23 kHz ± 3 dB (19cm/s) 30 Hz ~ 16 kHz ± 3 dB (9.5cm/s) When using standard tape 30 Hz ~ 20 kHz ± 3 dB (19cm/s) 30 Hz ~ 14 kHz ± 3 dB (9.5cm/s)
Distortion factor	1.5% or less (1 kHz, 0 VU)
Signal-to-noise ratio	50 dB or more
Erasure rate	70 dB or more
Crosstalk	Mono : 70 dB or higher Stereo : 50 dB or more
Recording bias frequency	100kHz
Heads	3 heads (record, play, erase)
Motor	One 4-pole induction motor
Early Winding Time (60Hz/50Hz)	120/150 seconds (370m tape used)
Recording time	2-hour stereo recording (9.5cm/s, 370m tape used)
Input Sensitivity / Impedance	Microphone : 0.8mV/5k Ω Line : 60mV/150k Ω
Output Level / Impedance	Line : 1.23 V (0 VU) / 100 Ω (optimum load impedance 20k Ω or more) Headphone : 30mV/8 Ω
DIN jack	70 mV or more (Low), 70 mV or more (High)
Semiconductor used	Transistor : 11 Diode : 4 pcs
Integrated circuit	Linear ICs : 4 units
Power supply voltage	100 VAC ~ 240 V, 50Hz/60Hz
Power consumption	35W
External dimensions	Width 406x Height 314x Depth 194 mm
Weight	11.4kg
Attachment	Connection code x2 Set Spare fuse