Optonica SM-4545 specifications

Category : Integrated amplifier

General

connectors

Technical data

special features

• manufacturer: Sharp Optonica
• model: SM-4545 (US-Version of the Optonica SM-4000 II)
• type: amplifier
• year of construction: 1975 - 1979
• color: silver
• remote control: no
• power consumption: 360 watts
• dimensions: 442 x 144 x 380 mm (WxHxD)
• weight: 16 kg
• factory price approx.: 115'000 Yen (Japan, 1975), 1'650 DM

• 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 (RCA): 150 mV
  • Tape Rec (DIN): 30 mV
  • Pre Out: 1 V
  • 2 pairs of Speakers (4 - 16 Ohm )

• 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

• Tape Rec (RCA): 150 mV
• Tape Rec (DIN): 30mV
• Pre Out: 1 V
• 2 pairs of Speakers (4 - 16 Ohm )

• the duration of the performance (total harmonic distortion)
  • 8 Ohm : 2x 70 W
  • 4 Ohm :
• dynamic performance
  • 8 Ohm s:
  • 4 Ohm :
• total harmonic distortion: 0.05 %
• damping factor: 5 - 40 000 Hz (± 1dB)
• signal-to-noise ratio:
  • Phono: > 65 dB
  • high level: > 85 dB
• control:
  • Bass: ± 10 dB (100 Hz, 2 dB steps)sound
  • 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

• 8 Ohm : 2x 70 W
• 4 Ohm :

• Phono: > 65 dB
• High level: > 85 dB

• Bass: ± 10 dB (100 Hz, 2 dB steps)
• Treble: ± 10 dB (10 kHz, 2 dB steps)

• Preamp and power amplifier separable

• Other models of 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

• Picture: Optonica SM-4545

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

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