YAMAHA SR-50
¥ 39,800 (around 1987)
Commentary
A surround amplifier with built-in Dolby surround sound that enables surround sound playback simply by adding it to the system.
Extracts the surround components contained in the original music source to create a realistic sensation.
It has 6 modes and a delay unit that can adjust the delay time continuously from 10 ms to 30 ms.
Surround modes include Dolby by Surround, which is the sound effect of Dolby Movie, Hall Surround, which reproduces the sound of a concert hall, Natural Surround, which reproduces the surrounding atmosphere of a concert, Defeat for mono source, Simulated Round, and Simulated Stereo.
Two pairs of presence speakers can be connected and can be switched.
Built-in 25W + 25W power amplifier.
In addition, it is equipped with a bus extension switch which is useful for playing the switch with the heavy bass of SF-X movies, etc., and a high filter switch which suppresses the high-frequency sound from the presence speaker when you feel it is annoying.
Model Rating
| Type | Surround amplifier |
| Rated output | 28W + 28W (6 Ω, Distortion 0.01%) 25W + 25W (8 Ω, strain 0.01%) |
| Frequency characteristic | 10 Hz to 50000 Hz |
| Total harmonic distortion factor | 0.01% |
| S/N ratio (IHF-A) | 106dB(MAIN IN) |
| Input Sensitivity / Impedance | 150mV/47k Ω |
| High filter | -12dB/oct(5kHz) |
| High extension | +7.5dB(70Hz) |
| Damping factor | 60 (1 kHz, 8 Ω) |
| Residual Noise (IHF-A) | -84dBV |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 57W |
| External dimensions | Width 435x Height 70x Depth 384 mm |
| Weight | 5.3kg |