Optonica SM-4545

Data

General

• Manufacturer: Sharp Optonica
• Model: SM-4545 (US version of the Optonica SM-4000 II)
• Type: Integrated amplifier
• Years of manufacture: 1975 - 1979
• Color: Silver
• Remote control: No
• Power consumption: 360 watts
• Dimensions: 442 x 144 x 380 mm (WxHxD)
• Weight: 16 kg
• Original price approx.: 115'000 Yen (Japan, 1975), 1'650 DM

Connections

• Number of inputs:
  • Phono 1, 2: 2.5 mV, 47 kOhm.
  • Tuner; 150 mV, 47 kOhm
  • 2x AUX: 150 mV, 47 kOhm

2x Tape: 150 mV, 47 kOhm

• • Main In: 500 mV, 100 kOhm
• Number of outputs:
  • Tape Rec (Cinch): 150 mV
  • Tape Rec (DIN): 30 mV
  • Pre Out: 1 V
  • 2 speaker pairs (4 - 16 Ohm)

Technical Data

• Continuous power (at distortion factor)
  • 8 Ohm: 2x 70 W
  • 4 Ohm:
• Dynamic power
  • 8 Ohm:
  • 4 Ohm:
• Total harmonic distortion: 0.05 %
• Attenuation factor: 5 - 40'000 Hz (± 1dB)
• Signal-to-noise ratio:
  • Phono: > 65 dB
  • High level: > 85 dB
• Tone control:
  • Bass: ± 10 dB (100 Hz, 2 dB steps).

Treble: ± 10 dB (10 kHz, 2 dB steps)

• Loudness: yes, +11.5 dB (100 Hz), +6.5 dB (10 kHz)
• High Filter: -3 dB (6 kHz, 12 dB/oct.)
• Low Filter (subsonic): -3.5 dB (60 Hz, 12 dB/oct.)
• Mute: yes, -20 dB

Special Features

• Pre- and power amplifier can be separated

Remarks

• Other models in the same series:
• Amplifier:
• Sharp SM 1400 H
• Optonica SM-3000
• Optonica SM-4000
• Optonica SM-4000 II
• Optonica SM-4545

• Tuner
• Sharp ST-1400 H
• Optonica ST-3000
• Optonica ST-3535

Pictures

• Image: Optonica SM-4545

• Excerpt from US advertisement: Optonica SM-4545, ST-3535