http://www.acustik.ro/128-thickbox_default/yamaha-a-s2000.jpg

Yamaha A-S2000

   Amplificator YAMAHA A-S2000, 160 W x 2, I/O (input to output) Direct Symmetrical Design, full-stage balanced signal transmission, floating balanced power amp, three parallel balanced volume and tone controls, four large capacity power supplies for power amp, discrete headphone amp for, discrete phono amp with high-precision head amp.

More details

Specificatii tehnice pentru Yamaha A-S2000

 

Max Power   (4 ohms, 1kHz, 0.7% THD, Max)
Total Harmonic Distortion (8 ohms, 20 Hz-20 kHz)     0.015%
Dynamic Power (8/6/4/2 ohms)          105/135/190/220 W
Frequency Response     5 Hz-100 kHz (+0 dB/-3 dB)
Damping Factor      160
Input Sensitivity (CD, etc.)       150mV/47k ohms
RIAA Equalization Deviation        20 Hz-20 kHz +/-0.5 dB
Signal-to-Noise Ratio (CD, etc.)      98 dB (S: 150 mV)
Dimensions (W x H x D)          435 x 137 x 465 
Weight        22.7 kg

HiFi Began with Yamaha

Yamaha’s involvement with and passion for music goes back more than a century, to when we built our first reed organ in 1887. Now we are the world’s leading producer of pianos and other musical instruments, and are involved with music in many other ways as well. We manufacture professional recording equipment, we design concert halls and we assist artists at concerts with set up and sound tuning. 
This knowledge and experience benefits our production of audio components in many ways. 
We introduced our first HiFi (High Fidelity) turntable in 1954, becoming the first company to actually use the term “HiFi.” 
Thereafter we were one of the first to offer mass-produced, high quality audio equipment, and introduced many legendary stereo components. 
We hope you enjoy the genuine HiFi experience of Yamaha Natural Sound.

Full Floating and Balanced Circuit Design Achieves for the First Time the Full Potential of Analogue Amplification

More than forty years have passed since the introduction and widespread adoption of full transistor HiFi audio amps during the 1960s.
In the 1970s, high performance, high output PNP-NPN transistors made possible the pure complementary configured power amps that are now the main type of high quality audio amps.
In recent years, however, digital amps have become popular for their high conversion efficiency and superior uniformity of operating precision, as well as for their lower weight, size and heat production as compared to analogue amps. 
Which leads to the question, which direction will audiophile-level amps take in the future?
Generally, two possibilities are considered: continuing to improve the traditional pure complementary configuration analogue amps or working to achieve higher sound quality from digital amps.
But Yamaha has selected a third approach. 
This is an entirely new floating and balanced power amp that, by using power transistors with the same polarity that are not complementary, achieves complete symmetry of pullable operation at the output stage and permits full balanced transmission
(amplification) from the input jack to just before the speaker jack — a capability that has long been the dream of audiophiles.