When to choose a purely post power amplifier

The line has been very clear, million yuan below the merger of the power amplifier after the part is not worth considering, especially the new out of the merger amplifier, after a serious shrinkage, false power, is extended to all the combined amplifier.

In fact, many years ago, there is no such thing cut corners, false power of things. It is now found that rivers and lakes have been past, full of commercial fraud. Many years ago on a million flagship amplifier, into a pure after the class, 60W × 3 +22 W × 4, with HTPC + D2, 7 big boxes pushed with gusto! The In the absence of subwoofer in the case, feel the strong sofa **, the other hand, today, in so many audio forums, talk about the most is "push", many manufacturers at every turn on the 100-200W × 7 nominal Power, but still do not move that, so I have been depressed, can not understand. I do not have to analyze why manufacturers have to do so, the power amplifier is a large number of the use of a large number of copper and aluminum! As long as a little older people should know that copper and aluminum in the past is only a little expensive, is worthless, ordinary people everywhere have bronze, and today?

Many friends do not understand the power amplifier to achieve what kind of performance, mistakenly think that as long as the power is large enough is king, but also do not know the merger power amplifier after the class and pure power amplifier in the end what is the difference. Those friends open mouth is to "control" Yeah, "resolution" ah, and so on, and how the amplifier can achieve these performance but I do not know.

A friend has consulted me after a 2-channel pure grade, I put forward the "damping coefficient" and "conversion rate" which is extremely critical but we are not familiar with the concept.

The most basic indicators of power amplifier: rated power.

Today, the power amplifier in the United States and Europe will be marked with the rated power. The old amplifier is also marked with the rated power method. Typically in the case of very low distortion power (such as 0.015%, measured at 20-20kHz power, more advanced power amplifier is measured at 0.008%). To have a strong output power, powerful power support is absolutely necessary! The size of the power reflects the intensity of the sound, that is, the amount of feeling.

The second basic indicator of the amplifier: all kinds of distortion.

The above has shown that this is a direct relationship with the size of the power. When the power amplifier is large enough, and only use a small part of its power, this time the distortion will be much smaller.

Combined power amplifier is often only after the use of a pair of power tube, power tube pairing on the great impact of distortion, the previous high-level amplifier is directly to the device production line pairing (such as the old amplifier distortion is very small, then Million to the equivalent of today's 100,000 yuan it), the cost is very high, and now tens of thousands of dollars within the amplifier is not like this to do. In the power tube matching poor today, but also in the high power with its small power to reduce the distortion. Distortion reflects the quality of the sound, that is, texture.

Advanced power amplifier only important indicators: damping coefficient.

A high-level amplifier, in addition to power and distortion, the output back to the internal control of the bass quality control has a great relationship. To ensure that there is a small output impedance in the high current environment, first of all must have high-quality high-power transformers, high current rectifier circuit and a strong capacitor filter circuit. These things and then the advanced combination of power amplifier due to space and cost constraints do not have. While the pure power amplifier in this area is several times the combined amplifier. Second, in order to achieve a strong output power and a very small transistor output impedance, the latter part of the power amplifier is a few pairs of power tube to work in parallel, and its control power is also stronger than the combined amplifier several times, and the combined amplifier only A pair of output power tubes (see how much of the heat sink can fit on the power tube).

Of course, the speaker wire thickness, copper content and the quality of the terminal, but also has a direct impact on the damping coefficient. Damping coefficient reflects the power amplifier on the bass control quality, that is, control.