Friends in the same trade
has been very clear that the combined power amplifier below 10000 yuan is not worth considering, especially the new merged power amplifier, the latter has been seriously shrunk, and the power is expanded to all of the combined power amplifier
In fact, years ago, no such thing. Jerry, false power now found in rivers and lakes has shrunk, riddled with fraud. A small commercial flagship amplifier million years ago, into a pure post, 60W * 3+22W * 4, HTPC+D2, 7 large boxes flavorfully no!. in the subwoofer case, feel strong sofa * *, today, in so many audio forum, talk about the most is the "push", many manufacturers are 100-200W * 7 of the nominal power, but also push said, let me have been depressed I can't understand, no longer. To analyze why manufacturers, power level is to use a lot of copper and aluminum! As long as a little older people should know, copper and aluminum in the past just a little more expensive than iron, is not valuable, ordinary people everywhere have the bronze however, today?
Many of my friends do not understand the real power to achieve what the performance, mistakenly believe that as long as the power is large enough is king, but also did not know the level of combined type power amplifier and pure power amplifier after what is different. Those friends talk is to "control", "resolution" and so on, and how to achieve these properties for the amplifier but all I do not know.
A friend once consulted me, a 2 channel pure level, I put forward the "damping coefficient" and "conversion rate" these two extremely critical, but we are not familiar with the concept
The most basic index of power amplifier: rated power
Now the United States and Europe will be marked with a rated power amplifier power amplifier is used. The old method of rated power marked. In general is very small distortion power situations (such as power, 0.015%, 20-20kHz measured at higher power amplifier is measured in 0.008%). In order to have a strong power output rate. Powerful power support is absolutely necessary! Power reflect the size of the sound intensity is feeling.
Power amplifier of the second basic indicators: a variety of distortion
It has been shown that this is directly related to the size of the power. When the power of the amplifier is large enough to use only a small part of its power, the distortion is much smaller at this time
The combined power level is often use a pair of power tube, power tube pairing has great influence on the distortion of power amplifier is used, advanced directly to the production line to the paired devices (such as the old power amplifier distortion is very small, million yuan in the year to the equivalent of $one hundred thousand today.), cost very high, now tens of thousands of yuan within the power amplifier is not like this. Do not match tube today in power, but also in high power with its small power to reduce the distortion. The distortion degree reflects the sound quality, or texture.
High power amplifier has important indexes: damping coefficient
A high power amplifier, except power and distortion, have a great relationship ability to control its output resistance back on bass quality. To ensure that in the current environment with low output resistance resistance, large power transformer must have high quality, high current rectifier and capacitance filter circuit powerful these things. More advanced combined type power amplifier due to the limitation of space and cost. Never have pure after power amplifier in this area is several times in the combined type power amplifier. Secondly, in order to achieve a strong resistance output transistor output power and minimal resistance, pure after power amplifier is adopted to parallel tube power the number of, its control is better than the combined power several times, and combined with a power amplifier on the power output tube (see that small radiator can be installed on the number of power tube?).
Of course, the thickness of the horn, the quantity of copper and the quality of the terminal also have a direct influence on the damping coefficient. The damping coefficient reflects the control quality of the amplifier to the bass, that is, the control force