Akai GX-630D-SS

• Track system: 4-track, 4-channel (quadraphonic) and 2-channel stereo/multi-channel compatibility

• Heads: 1 x GX record head, 1 x GX playback head, 2 x erase heads; all use Permalloy material

• Motors: 3 motors — 1 direct drive AC servo capstan motor (Center Pole Generated technology), and 2 eddy current outer rotor motors for reel drive

• Maximum reel size: 10.5 inches

• Tape speeds: 3¾ and 7½ inches per second

• Wow and flutter: 0.06% at 7½ ips, 0.1% at 3¾ ips

• Frequency response: 30 Hz to 21 kHz (+-3 dB at 7½ ips speed)

• Signal-to-noise ratio: 54 dB

• Total harmonic distortion: 0.5%

• Crosstalk: 40 dB

• Inputs: 70 mV (line), 0.25 mV (mic)

• Outputs: Line output at 0.775 V, two stereo headphone jacks

• Semiconductors: 65 transistors, 63 diodes, 4 ICs

• Dimensions: 20.9" (W) x 17.3" (H) x 10.4" (D) / 530 x 440 x 265 mm

• Weight: 45.5 lbs (20.7 kg)

• Additional features: Quadra Sync feature allowing mini home-studio use with 4-channel surround monitoring, pitch control with 5% speed modulation, four microphone inputs, two headphone outputs, 10½ inch reel capacity

• Power supply: Multivoltage, 110-120 V and 220-240 V

• Manufacture period: 1976 to 1980

• Market category: Mid-high fidelity consumer/semipro reel tape deck with advanced multi-channel and quadraphonic capabilities

This model is noted for its advanced quadraphonic recording and monitoring capabilities, robust triple-motor transport system, and highly durable GX heads designed to reduce wear and maximize audio fidelity.