YAMAHA MX-55
¥ 98,000 (released in 1987)
Commentary
A 4-ch / 2-ch switchable power amplifier developed for DSP systems.
Four presence speakers can be driven by a 2-amp independent power supply system with a symmetrical design (left / right for 2 ch, front / back for 4 ch).
It can also be used as a stereo power amplifier with a 4-ch / 2-ch selector switch.
Equipped with a level control, you can adjust the volume level of each of the front and rear speakers for 4 ch, and each of the left and right speakers for 2 ch.
Model Rating
| Type | 2ch/4ch Power Amplifier |
| Rated Output (20 Hz ~ 20 kHz) | 2 ch : 100W + 100W (6 Ω) 4 ch : 50Wx4 (6 Ω) |
| Dynamic Power | 2 ch : 210W + 210W (2 Ω) 4 ch : 80Wx4 (2 Ω) |
| Frequency characteristic | 20 Hz ~ 20 kHz + 0 -0.3 dB |
| Total harmonic distortion rate (1 kHz) | 2 ch : 0.002% (8 Ω, 45W) 4 ch : 0.003% (8 Ω, 20W) |
| Signal-to-noise ratio | 2 ch : 123 dB 4 ch : 120 dB |
| Power consumption | 180W |
| External dimensions | Width 435x Height 129x Depth 379 mm |
| Weight | 11kg |