What is the difference between professional power amplifier and home power amplifier？

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What is the difference between professional power amplifiers and home power amplifiers? I believe many audio enthusiasts have seen the electrical schematic diagrams of professional power amplifiers and home power amplifiers. If you only look at the electrical schematics, it seems that there is no obvious difference between professional power amplifiers and home power amplifiers. From the point of view of usage, both are used to drive speakers to reproduce sound, which seems to be the same. From the perspective of performance indicators, the basic performance indicators of this power amplifier and professional power amplifiers are also similar. In fact, there are many differences between professional power amplifiers and home power amplifiers.

Professional amplifiers generally need to work for a long time and continuously at high power. Therefore, professional amplifiers require large power margins, high reliability, low output stage temperature rise, and better circuit stability. To meet such requirements, amplifiers have special considerations that are different from household amplifiers in terms of design, materials, and morality. For example, the capacity of the power circuit of a professional power amplifier is often based on the actual consumption of the amplifier, plus sufficient margin, so it is much larger than the capacity of a household power amplifier of the same nominal power. The high-power components of professional power amplifiers often choose specifications with higher maximum current and withstand voltage than the rated value. The radiator of the output stage also uses a large exposed radiator to facilitate heat dissipation and ensure a higher temperature rise during inequality time work. Low. If we look at professional power amplifiers and household power amplifiers with the same rated output power of 100W×2, we can find that the radiator of professional power amplifiers is much larger. This is because although the home power amplifier has a nominal rated output power of 100W, in actual use it often only works at a small output power (generally, the average power is about 10W). Only when the sudden peak signal of certain music is broadcast, it is possible to reach an output power of tens of watts in a short time. Therefore, the actual workload of the output stage of the home power amplifier is relatively light. Professional power amplifiers with a rated output power of 100W often reach close to "full power" in actual use. The actual working load is heavier, so the output stage generates more heat and requires a larger radiator for good performance. Heat dissipation.

From the perspective of amplifier design requirements

Household amplifiers are often used in quieter home environments, and are usually used for music appreciation and movie playback. The HI-FI amplifier used in the home is used to more realistically broadcast the "original sound" of the music, requiring the level and detail of the music to be broadcast. Therefore, home power amplifiers have higher requirements for sound fidelity, and require softer, detailed, and pleasant sounds. Professional power amplifiers are often used in large-scale sound reinforcement and used to drive professional speakers. Therefore, they require strong driving ability, sufficient output power, bright and clear sound, and sufficient strength. Therefore, the sound characteristics of the two are also somewhat different. However, some very advanced professional power amplifiers also pay more attention to the fidelity of the broadcast sound. If matched with higher-level professional speakers, the sound broadcast is clearer, more detailed, and better.

From the perspective of function settings

Professional power amplifiers often work with front-end equipment such as mixers, so they are mostly pure rear-end amplifiers. The setting of professional amplifier is very simple, often there are only power switch and output level adjustment potentiometer (or step attenuator) on the panel. However, due to the actual needs of professional power amplifiers, it can often work in a dual-channel state or become a mono amplifier after being "bridged". Therefore, professional power amplifiers are mostly equipped with a "bridge" switch. There are many models of household power amplifiers that are "combined" amplifiers with pre-amplifiers. This combined amplifier has more functions, often with audio source selection, monotone control, and multiple audio input interfaces.

From the perspective of the working status of the amplifier

Professional power amplifiers pay more attention to the efficiency of the amplifier, so most of them are class AB amplifiers. Some household power amplifiers use Class AB amplifiers, or "high-biased Class AB" amplifiers, some use Class A amplifiers, and some also use dynamically biased "Super Class A" amplifiers. From the output power point of view, professional power amplifiers tend to have relatively large output power, and the output power of a single unit can reach more than 1000W. The rated output power of household power amplifiers is mostly below 200W.

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