Category:Mid High Fidelity (most Japanese recorders fall into this category)
Country of Manufacture:Norway
Release dates:1971 - 1975
Speeds: 1 7/8, 3 3/4, 7 1/2
Max Reel Size("): 7"
Number of heads: 4
Dimension: 15½ x 12½ x 6½ " (394 x 318 x 165mm)
Head Composition: Permalloy
Head Configuration: Stereo
# Motors: 1
Voltage(s): 110-120v, 220-240v
Frequency Response:7½ ips: 40Hz - 22kHz 3¾ ips: 40Hz - 18kHz 1 ips: 40Hz - 10kHz
Wow and Flutter:7½ ips: 0.07% 3¾ ips: 0.14%. 1 7/8 ips: 0.28%
Signal-to-Noise Ratio:1/4 Tr. 60 dB, 1/2 Tr. 62 dB
Sound quality rating:6 / 10
Long-term reliability rating: 5 / 10
Weight: 23 lbs (10.6kg)
Identical to the 6000X but with an inbuilt 10 watt RMS per channel stereo amplifier and
twin internal 4″ x 7″ speakers, the 4000X was a three-speed, single motor recorder with four heads (erase, record, playback and crossfield bias) and a seven inch reel capacity.
Continuously variable dual-concentric bass and treble knobs were provided (for playback only).
Features included line/mic mixing, sound on sound, echo, illuminated four-digit revolution counter and automatic end-stop.
Speed tolerance: 1% / Crosstalk: mono > 60dB. stereo > 50dB (at 1,000Hz) / Bias frequency: 85.5kHz. Distortion less than 0.5% / Rewind speed: 1200ft – 1 min 45 sec. 1800ft – 2 min 10 sec / Audio output power: 2 x 10 watts R.M.S. / Inputs: mic: (balanced) impedance 200 – 700 ohm sens. 70uV max 70mV line: impedance 100K sensitivity 5mV max 15V phono: magnetic- 33 kohms, 1mV @ 1000Hz / Outputs: emitter follower: 200ohms 1.5V line: 5K 160mV radio: 5K 0.75V stereo headphone socket: min impedance 200ohms 1.5V / Speaker(s): two internal 4″ x 7″ speakers