The black A-S2000 Natural Sound Stereo Amplifier from Yamaha boasts a power output of 90W x 2 (RMS) and uses high quality components and construction to provide fine acoustic performance. The A-S2000 achieves fully balanced signal transmission from input to output. Balanced transmission is capable of canceling internally and external noise, and for this reason, is considered to be an ideal amplification method. The A-S2000 offers full-stage balanced transmission, combining high-power output with excellent sound texture and outstanding S/N performance.
The A-S2000 features four large capacity power supplies for the power amp, and is completely isolated from ground. Shunt-type local regulators that prevent degradation of sound quality by amperage fluctuation establish a clean and stable power supply for the preamp. An extremely low-noise phono preamp and dedicated MC step-up circuit are responsible for musical clarity and imaging with both MC and MM phono cartridges. A fully discrete, high-performance headphone amp performs admirably with even the most cutting-edge audiophile 'phones.
Completely symmetrical construction offers the ultimate in integrated amp left-right separation, a central reinforcing bar provides rigidity and stability, and specially designed height-adjustable feet allow listeners a choice of two bases.
| Maximum Power | 8 ohms, 1 kHz, 10% THD: 120 W + 120 W / 4 ohms, 1 kHz, 10% THD: 190 W + 190 W |
| RMS Output Power | Minimum: 8 ohms, 20 Hz-20 kHz, 0.02% THD: 90 W + 90 W / 4 ohms, 20 Hz-20 kHz, 0.02% THD: 150 W + 150 W |
| Dynamic Power per Channel | 8 / 6 / 4 / 2 ohms: 105 / 135 / 190 / 220 W |
| Damping Factor | 8 ohms, 1 kHz: 160 |
| Input Sensitivity and Impedance | CD 150 mV / 47 kohms, Phono MM 2.5 mV / 47 kohms, Phono MC 100 μV / 50 ohms, Main in 1 V / 47 kohms |
| Frequency Response | CD, etc. to speaker out, Flat position 5 Hz-100 kHz +0 dB / -3 dB, CD, etc. to speaker out, Flat position 20 Hz-20 kHz +0 dB / -0.3 dB |
| Deviation | RIAA Equalization Deviation: Phono MM (20 Hz-20 kHz) ±0.5 dB / Phono MC (20 Hz-20 kHz) ±0.5 dB |
| THD | 20 Hz-20 kHz: CD balanced to speaker out 0.01% (90 W / 8 ohms), CD, etc. to speaker out 0.015% (90 W / 8 ohms), Phono MM to rec out 0.005% (2 V), Phono MC to rec out 0.05% (2 V) |
| Signal to Noise Ratio | IHF-A Network: CD, etc., (150 mV, Input Shorted) 98 dB, Phono MM (5 mV, Input Shorted) 93 dB, Phono MC (500 μV, Input Shorted) 85 dB |
| Residual Noise | CD, etc., IHF-A-Network |
| Channel Separation | 1 kHz/10 kHz: CD, etc., Input 5.1 kohms Terminaled 74 dB / 54 dB, Phono MM, Input Shorted, Vol: -30 dB 90 dB / 77 dB, Phono MC, Input Shorted, Vol: -30 dB 66 dB / 77 dB |
| Tone Control | Bass Boost / Cut (at 50 Hz) ±9 dB, Bass Turnover Frequency 350 Hz, Treble Boost / Cut (at 20 Hz) ±9 dB, Treble Turnover Frequency 3.5 kHz |
| Mute | -20 dB (approx.) |
| Load Impedance | If you use two sets (A and B), the impedance of each speaker must be 8 ohms or higher |
| Inputs/Outputs | 5 x RCA audio inputs, including MM (moving magnet) / MC (moving coil) phono input 1 x Set of balanced 3-pin XLR inputs 1 x Preamp out / main in jacks 1 x Headphone jack |
| Power Requirements | AC 120 V, 60 Hz |
| Power Consumption | Normal: 350 W Idling: 80 W |
| Dimensions (W x H x D) | 17.1 x 5.4 x 18.3" (434.3 x 137.2 x 464.8 mm) |
| Weight | 50 lb (22.7 kg) |
| Packaging Info | |
|---|---|
| Package Weight | 56.5 lb |
| Box Dimensions (LxWxH) | 22.0 x 21.5 x 9.3" |