C-7 spec:
Input Sensitivity / Impedance Tuner, CD, Line1-3 : 150mV/50k Ω
Balance Line1/2 : 150mV/100k Ω
Output Level / Impedance Co-axial : rated 1V/300 ohm
7.5 v max.
Balance : Rated 1V/600 Ω
7.5 v max.
Total harmonic distortion factor 0.005% or less (rated)
Frequency characteristic 20 Hz ~ 20 kHz + 0 -0.1 dB
Signal-to-noise ratio 110 dB or more
Tone control Treble : Turnover 3 kHz, max ± 8 dB, 10 kHz ± 6 dB
Bass : turnover 300 Hz, max + / - 8 dB, 100 Hz + / - 6 dB
Attachment Tape Dubbing 2 Systems (1 → 2, 2 → 1)
Rec off
Straight-through switch
Output mode selector switch
Remote (Power) output
Line phase sensor
Output phase selector switch
Maximum external dimensions Width 467x Height 187x Depth 435 mm
Weight 18.0kg

M-7i
Type Stereo power amplifier
Continuous effective output
Stereo : 230W + 230W (4 Ω)
150W + 150W (8 Ω)
Monaural : 460W (8 Ω)
Input sensitivity 1V/150W (8 Ω)
1V/100W (8 Ω, Reference Position)
Input impedance Coaxial : 45k Ω
Balance : 66k Ω
Gain gain) 32dB
Total harmonic distortion factor 0.004% (1 kHz, 8 Ω)
0.03% (20 Hz to 20 kHz, 8 Ω)
Signal-to-noise ratio 115 dB (1 kHz, IFF-A)
Maximum external dimensions Width 467x Height 212x Depth 440 mm
Weight 26.5kg