Akai-4000DB

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

• Heads: 3 heads - erase, GX record, and GX playback heads made of ferrite/glass

• Motor: Single 4-pole induction motor (IMC-100)

• Tape Speeds: 3¾ and 7½ inches per second (7½ ips with capstan sleeve)

• Maximum Reel Size: 7 inches

• Frequency Response: 30 Hz to 24 kHz at 7½ ips (±3 dB)

• Wow and Flutter: Less than 0.08% at 7½ ips

• Signal-to-Noise Ratio:
  GX-4000D: better than 60 dB at 7½ ips
  GX-4000DB: better than 70 dB at 7½ ips (due to Dolby Noise Reduction)

• Total Harmonic Distortion: Less than 1% (at 1 kHz, 0 VU)

• Distortion: Less than 1%

• Inputs: 70 mV (line), 0.25 mV (mic)

• Outputs: RCA line output, 0.58 V (line output)

• Dimensions: 440 mm (W) x 315 mm (H) x 230 mm (D)

• Weight: 13.2 kg (29 lbs)

• Power: Voltage 110-120 V or 220-240 V

• Additional Features: Dolby B noise reduction, sound-on-sound (SOS) function via a pull-switch, relocated track selector switch, extra output level control on the front panel, capstan speed change sleeve hidden under the head cover when not in use, compact and solid build typical of Akai's top consumer models in the late 70s to early 80s.

The GX-4000DB is well regarded for its durability, excellent sound quality aided by the GX heads, and added Dolby B noise reduction technology providing enhanced audio clarity. It is a favored model among vintage reel-to-reel enthusiasts.