Industry insiders have always been very clear that the rear part of the combined power amplifier below 10000 yuan is not worth considering, especially the newly released combined power amplifier, which has severely shrunk and falsely reported power, and even expanded to all combined power amplifiers.

In fact, many years ago there was no such thing as cutting corners and falsely reporting power. Now it has been discovered that the martial arts world is no longer the same as before, filled with 

commercial deception everywhere. Many years ago, a small flagship amplifier worth tens of thousands of yuan was upgraded to a pure one, with 60W x 3+22W x 4, using HTPC+D2, pushing seven 

large boxes to make it taste delicious!. Without a subwoofer, I feel a strong sense of sofa * *. On the other hand, today, on so many audio forums, the most talked about topic is "can't be pushed". 

Many manufacturers have a nominal power of 100-200W × 7, but there is still the saying of "can't be pushed", which has been frustrating and incomprehensible to me. I won't analyze why the 

manufacturer did this anymore. The amplifier uses a lot of copper and aluminum afterwards! Anyone who is a little older should know that copper and aluminum were only slightly more expensive 

than iron in the past and were not valuable. Ordinary households have copperware everywhere, but what about today?

Many friends are not very familiar with what kind of performance an amplifier really needs to achieve, mistakenly believing that as long as the power is large enough, it is the best. They also have no 

idea what the difference between a combined amplifier and a pure amplifier is. Those friends keep talking about "control", "resolution", and so on, but they have no idea how amplifiers can achieve 

these performances.

A friend once consulted me about a 2-channel pure speaker, and I proposed two crucial but unfamiliar concepts: "damping coefficient" and "conversion rate".

Basic specifications of power amplifier: rated power.

Nowadays, amplifiers in the United States and Europe are labeled with their rated power. Old amplifiers are also labeled with rated power. Generally, the power is measured at very low distortion

 (such as 0.015%, power measured at 20-20kHz, and power amplifier measured at 0.008%). To have strong output power, powerful power support is necessary! The magnitude of power reflects the 

intensity of sound, that is, the sense of quantity.

The second basic indicator of an amplifier is various levels of distortion.

The above has already indicated that this is directly related to the magnitude of power. When the power of the amplifier is high enough and only a small portion of its power is used, the distortion 

will be much smaller.

After merging power amplifiers, only a pair of power transistors are often used, and the pairing of power transistors has a significant impact on distortion. In the past, high power amplifiers were 

directly paired on the device production line (for example, the distortion of old amplifiers was very small, and ten thousand yuan back then was equivalent to one hundred thousand yuan today), and 

the cost was very high. Today's amplifiers under tens of thousands of yuan will not do this. In today's world where power transistor pairing is poor, it is even more important to use its small power at 

high power to reduce distortion. The distortion reflects the quality of the sound, that is, the texture.

An important indicator that only high power amplifiers have: damping coefficient.

A high power amplifier, in addition to power and distortion, has a significant impact on the ability to control bass quality through the internal resistance of its output. To ensure minimal output 

impedance in high current environments, it is necessary to have high-quality high-power transformers, high current rectification circuits, and powerful capacitor filtering circuits. No matter how high 

these things are, combined amplifiers will never have them due to space and cost limitations. And pure post amplifier is several times better than combined amplifier in this regard. Secondly, in order 

to achieve strong output power and extremely low transistor output impedance, pure post amplifier uses several pairs of power transistors to work in parallel, and its control power is several times 

stronger than that of combined amplifier, which only uses one pair of output power transistors (see how many pairs of power transistors can be installed in such a small heat sink?).

Of course, the thickness and copper content of the horn wire, as well as the quality of the terminal post, also have a direct impact on the damping coefficient. The damping coefficient reflects the 

control quality of the amplifier over bass, that is, the control force.