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Comparison Yamaha A-S501 vs Yamaha A-S301

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Yamaha A-S501
Yamaha A-S301
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Device typeintegrated amplifierintegrated amplifier
Element basetransistortransistor
Capacitor capacitance12 mF7 mF
Amplifier parameters
Number of channels22
Frequency range
10 – 100000 Hz /+/- 1 дБ/
10 – 100000 Hz /+/- 1 дБ/
Power per channel (8Ω)85 W60 W
Power per channel (6Ω)100 W70 W
Signal to noise ratio99 dB99 dB
Signal to noise ratio (Phono MM/MC)82 dB82 dB
Damping factor240210
Harmonic distortion0.019 %0.019 %
Channel sensitivity / impedance
Line input
200 mV
47 kOhm
200 mV
47 kOhm
Phono MM/MC
3 mV
47 kOhm
3 mV
47 kOhm
REC output
200 mV
1 kOhm
200 mV
1 kOhm
Connectors
Inputs
Phono
coaxial S/P-DIF
optical
Phono
coaxial S/P-DIF
optical
RCA4 pairs4 pairs
Outputs
to subwoofer
to subwoofer
For acoustics4 шт4 шт
REC (to recorder)2 pairs2 pairs
On headphones6.35 mm (Jack)6.35 mm (Jack)
Front panel
indicators
headphone output
indicators
headphone output
Features
Adjustments
bass control
treble adjustment
balance adjustment
level adjustment
loudness
bass control
treble adjustment
balance adjustment
level adjustment
loudness
More features
By-pass/Direct
auto power off
ММ phono stage
additional speaker connect
Bi-Wiring
By-pass/Direct
auto power off
ММ phono stage
additional speaker connect
Bi-Wiring
General
Remote control
PSUinternalinternal
Power consumption
240 W /510 W maximum/
190 W /430W maximum/
Standby consumption0.5 W0.5 W
Dimensions (WxDxH)435x387x151 mm435x387x151 mm
Weight10.3 kg9 kg
Color
Added to E-Catalogjanuary 2015january 2015

Capacitor capacitance

The total capacitance of the capacitors installed in the power supply of the amplifier. Usually, for ordinary lovers of high-quality sound, this indicator is not practically significant: the capacitance is selected in such a way as to optimally (or at least minimally) match the characteristics of the amplifier. However, for demanding audiophiles who pay attention to the smallest details of audio system components, capacitors are also often of interest.

The fact is that they are an important part of the rectifier circuit — they smooth out current fluctuations that arise both due to the imperfection of the rectifiers themselves and due to various external factors. Knowing the total capacitance of the capacitors, one can also evaluate the efficiency of their work: the higher this indicator, the more stable the power supply will work and the lower the likelihood of sound distortion due to its fault. There are special formulas that allow you to derive the optimal capacitance of capacitors depending on the type, power and other parameters of the amplifier; they can be found in specialized sources.

Power per channel (8Ω)

The nominal sound power output by the amplifier per channel when operating with a load having a dynamic resistance (impedance) of 8 ohms. In our catalog, this parameter is indicated for the mode when all channels of the amplifier work under load (see "Number of channels"); in the presence of unused channels, the rated power may be slightly higher, but this mode cannot be called standard.

Rated power can be simply described as the highest output signal power at which the amplifier is able to work stably for a long time (at least an hour) without negative consequences. These are average figures, because in fact, the audio signal is by definition unstable, and individual level jumps can significantly exceed the rated power. However, it is she who is the main basis for assessing the overall loudness of the sound.

This indicator also determines which speakers can be connected to the amplifier: their rated power should not be lower than that of the amplifier.

According to the laws of electrodynamics, with different dynamic load resistance, the output power of the amplifier will also be different. In modern speakers, the standard values \u200b\u200bare 8, 6, 4 and 2 Ohms, and power levels are indicated for them.

Power per channel (6Ω)

The nominal sound power output by the amplifier per channel when a load with a dynamic resistance (impedance) of 6 ohms is connected to it. See Power per Channel (8Ω) for more information on power rating and its relationship to impedance.

Damping factor

The damping factor describes the quality of interaction between the amplifier and the speaker system connected to it.

Due to the design features, any speaker is prone to the occurrence of so-called parasitic oscillations — oscillations that continue after the main impulse from the amplifier has ceased (similar to how a string continues to vibrate after a pluck). This phenomenon has a negative effect on sound quality, and manufacturers use various means to reduce it to an absolute minimum; suppression of parasitic oscillations is called damping.

The most effective type of damping is electrical, by reducing the output impedance of the amplifier. The lower this resistance, the better the amplifier keeps the speakers from unnecessary vibrations. To evaluate this effect, they introduced the concept of “damping factor” (damping factor) — the ratio of the load resistance (impedance) to the output resistance of the amplifier. The minimum value of such a coefficient for Hi-Fi class equipment is 20; indicators at the level of 100 – 120 can be called good, and among the Hi-End segment there are numbers of the order of several thousand.

At the same time, it is worth noting that when increasing to three-digit numbers, the original meaning of this parameter is, in fact, lost, and other points appear. The most important of them from a practical point of view is that models with a high damping factor are very demanding on the quality of the connection to t...he speakers — the high resistance of cables and connectors can negate the damping properties of the amplifier itself. There are other nuances associated with this indicator (in particular, recommendations for choosing an amplifier and speakers for each other); they are described in detail in specialized sources.

Power consumption

The power consumed by the amplifier during normal operation. Some manufacturers may indicate average power values, some — indicators at maximum load. However, anyway, this parameter allows you to quite adequately assess the power consumption of the device and the requirements for connected power.

In addition, it can be useful if you have doubts about the accuracy of the claimed data on the output power (see "Power per channel (8Ω)"). The basic rule is that the total power rating of all channels cannot exceed the total power consumption of the amplifier. In addition, there are special formulas that allow you to derive the maximum possible rated power depending on the power supply and type of amplifier; they can be found in special sources.
Yamaha A-S501 often compared
Yamaha A-S301 often compared