Akai X-355

• Track System: 4-track, 2-channel stereo/monaural quarter-track system with cross-field bias technology

• Tape Speeds: 3¾, 7½, and 15 inches per second (IPS) with optional adapter for 15 IPS

• Maximum Reel Size: Up to 10.5 inches, with optional outrigger adaptors for larger reels

• Heads: 4 heads — erase, play, record, and separate cross-field bias head made of permalloy for superior fidelity

• Motors: 3 motors — hysteresis synchronous capstan drive and two reel motors with eddy current braking

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

• Wow and Flutter: 0.08% RMS or less at 7½ IPS

• Signal-to-Noise Ratio: 45 dB or better

• Total Harmonic Distortion: Approximately 3%

• Inputs: Microphone (0.5 mV), Line (100 mV) — mixable

• Outputs: Line (0 to 1 V, 10 kΩ), headphone output

• Output Power: 20 watts per channel driving built-in speakers (in models with amplifier)

• Dimensions: 426 x 457 x 318 mm (16¾" x 18" x 12½")

• Weight: Approximately 28.5 kg (62.7 lbs)

• Construction: Solid-state electronics with modular amplifier cards, wood walnut case panels, and large push-button controls

• Features: Auto-reverse play, remote control capability, mechanical tape counter, tape lifter, echo effects, sound-on-sound recording, and multiplex recording support

• Period: Manufactured between 1965–1968 in Japan

• Specialty: Known for the early use of cross-field recording technology to improve high-frequency recording quality and overall audio fidelity

The X-355 was a premium mid-60s reel-to-reel for audiophiles and semi-professional users. Its build was robust, and it stood out for its advanced recording technology and excellent sound reproduction for the era.