Akai GX-650D

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

• Heads: 1 x GX record head, 1 x GX playback head, 1 x erase head made from Akai's glass and ferrite material for durability and sound clarity

• Motors: 2 x reel drive motors and 1 x double capstan AC servo motor for stable tape transport (Closed Loop Double Capstan System)

• Maximum Reel Size: Up to 10.5 inches

• Tape Speeds: 3¾, 7½, and 15 inches per second

• Frequency Response: 30 Hz to 30 kHz (at 15 ips tape speed)

• Wow and Flutter: 0.04% at 15 ips

• Signal-to-Noise Ratio: 58 dB (DIN standard, at +6 VU)

• Total Harmonic Distortion: 0.4%

• Inputs: 80 mV (line), 0.3 mV (microphone)

• Outputs: 0.775 V (line)

• Semiconductors: 72 transistors, 61 diodes, and 1 integrated circuit

• Dimensions: 524 mm (W) x 442 mm (H) x 258 mm (D) (approx. 20.6" x 17.3" x 10")

• Weight: 26.2 kg (57.6 lbs)

• Features:
  High-quality Closed Loop Double Capstan servo tape transport for outstanding stability and low wow/flutter
  Glass and crystal ferrite heads known for longevity and high fidelity
  Multiple speeds and precise tape tension controls
  Digital tape counter and auto stop function
  Mic and headphone inputs for versatile recording and monitoring
  Optional remote control available

• Manufacture Period: 1976-1979

• Market Position: High-fidelity consumer and semi-professional tape recorder with excellent audio quality and reliable operation suitable for audiophiles and studio use

This model is praised for its precise tape handling, wide frequency response with advanced GX heads, and robust build quality, marking it as one of Akai's premium reel-to-reel recorders of the period.