Akai GX-646

• Track System: Auto-reverse, 4-track, 2-channel stereo system.

• Heads: 6 heads total — 2 erase, 2 record (GX heads), and 2 playback (GX heads) made from ferrite/glass material for durability and high fidelity.

• Motors: 3 motors — 2 reel drive, and 1 AC servo direct drive capstan motor with Center Pole Generated (CPG) technology.

• Reel Size: Supports large reels up to 10.5 inches.

• Tape Speeds: 2 speeds — 3¾ and 7½ inches per second.

• Frequency Response: 25 Hz to 26 kHz (+/- 3 dB) at 7½ ips; 25 Hz to 25 kHz at 3¾ ips.

• Wow and Flutter: 0.03% WRMS at 7½ ips; 0.04% WRMS at 3¾ ips.

• Signal-to-Noise Ratio: 65 dB at 7½ ips.

• Total Harmonic Distortion: 0.4% at 7½ ips.

• Inputs: Mic input 0.25 mV, line input 70 mV, DIN input 2 mV.

• Outputs: Line output 0.775 V, DIN output 0.3 V.

• Dimensions: 440 mm (W) x 483 mm (H) x 256 mm (D) (about 17.3" x 19" x 10.1").

• Weight: 21 kg (46.4 lbs).

• Features:
  Auto reverse with both-way recording.
  Multiple automatic features including timers, tape bias adjustments, and tape position memory.
  “Hanging” type VU meters.
  Three-mode timer start switch.
  Additional bias adjustment control on the front panel.
  Capability to use Extra Efficiency (EE) tapes for higher magnetic density recording and improved frequency response.
  High build quality with feather touch, logic control, and reliable tape transport.

• Production Years: 1982-1984.

• Market Position: Mid-high fidelity consumer level with features approaching semi-professional quality.

This model is known for excellent sound quality, reliable transport, and advanced features for its time, considered a solid choice for audiophiles requiring precise playback and recording with EE tape compatibility.