Akai 4000DS

The Akai 4000DS is a mid-1970s solid-state reel-to-reel tape deck with a strong reputation for quality and reliability in the consumer and semi-professional audio market.

Technical Overview

• Track System: 4-track, 2-channel stereo/monaural

• Heads: Three heads — erase, record, playback (permalloy heads)

• Motor: Single 4-pole induction motor with a large flywheel for stable tape transport

• Tape Speeds: Two speeds — 3 3/4 ips and 7 1/2 ips

• Maximum Reel Size: Up to 7 inches

• Frequency Response: 30 Hz to 23 kHz (±3 dB) at 7 1/2 ips

• Wow and Flutter: Less than 0.15% at 7 1/2 ips

• Signal-to-Noise Ratio: 50 dB

• Total Harmonic Distortion: Less than 1.5%

• Crosstalk: 50 dB

• Inputs:
  Line input: 70 mV, 100 kohms
  DIN input: 7 mV
  Microphone input: 0.8 mV, 5 kohms

• Outputs: Line output 1.228 V, DIN output 0.4 V, headphone output 30 mV at 8 ohms

• Semiconductors: 11 transistors, 4 integrated circuits, 4 diodes

• Dimensions: 406 mm (W) x 314 mm (H) x 194 mm (D)

• Weight: 11.4 kg (25 lbs)

• Other Features:
  Slip-on capstan sleeve for speed change
  Three-head system allows for simultaneous monitoring of recording and playback
  No pressure pads used in tape transport, reducing head wear
  VU meters for monitoring levels
  Auto shut-off to protect tape and deck at end of reel
  Rewind time approximately 150 seconds for a 1200 ft tape

Summary

The Akai 4000DS is known for its efficient and stable tape transport, excellent frequency response extending to 23 kHz, and low distortion. Its three-head design supports live monitoring for precise recording adjustments. The device balances user-friendly features with solid build quality, making it a popular choice in its era for home and semi-professional recording applications.