[Home Theater Network] What is the difference between professional amplifiers and home amplifiers? I believe many audio enthusiasts have seen the electrical schematics of professional amplifiers and home amplifiers. If you only look at the electrical schematic, it seems that there is no obvious difference between professional amplifiers and home amplifiers. From the point of view of use, both are used to drive the sound of the speakers, which seems to be the same. From the performance indicators, the basic performance indicators of this amplifier and professional power amplifier are similar. In fact, there are quite a few differences between professional amplifiers and home amplifiers.
Professional amplifiers generally need to work in a high-power state for a long time, so professional power amplifiers require large power headroom, high reliability, small temperature rise at the output stage, and good circuit stability. In order to meet such requirements, amplifiers have special considerations different from home amplifiers in terms of design, materials, and ethics. For example, the capacity of a power amplifier circuit of a professional power amplifier is often based on the actual consumption of the amplifier, plus a sufficient margin, and therefore a much larger capacity than a home power amplifier of the same nominal power. The high-power devices of professional power amplifiers also often choose the specifications that the maximum current and withstand voltage are higher than the rated value. The radiator of the output stage also uses a large exposed radiator to facilitate heat dissipation and ensure the temperature rise during inequality working. low. If we look at professional power amplifiers and home amplifiers with a rated output power of 100W×2, we can find that the radiators of professional amplifiers are much larger. This is because the household power amplifier has a nominal rated output power of 100W, but in actual use, it only works in a state of smaller output power (generally uniform power is about 10W). It is only possible to reach tens of watts of output power in a short period of time when delivering bursty peaks of certain music. Therefore, the actual working load of the household power amplifier output stage is lighter. Professional power amplifiers with a rated output power of 100W often reach a near-full power state in actual use, and the actual working load is heavier. Therefore, the output stage has a higher heat generation, and a larger heat sink is required to perform well. Cooling.
From the design requirements of the amplifier, the home amplifier is often used in a quieter home environment, usually used for music appreciation and film playback. The home HI-FI amplifier is designed to deliver the "original sound" of the music more realistically, requiring the level and detail of the music to be delivered. Therefore, the home amplifier has a higher requirement for the fidelity of the sound, and requires the sound to be softer, more meticulous and pleasant. Professional amplifiers are often used for sound reinforcement in large occasions, which are used to drive professional speakers. Therefore, they require strong driving capability, sufficient output power, bright sound, clear and sufficient strength. Therefore, the sound characteristics of the two also have certain differences. However, some of the most advanced professional power amplifiers are also more concerned with the fidelity of the sound. If combined with higher-level professional speakers, the sounds that are delivered are also clearer, more detailed, and better in layering.
From the point of view of function setting, professional power amplifiers often work with preamplifiers such as mixers, so they are mostly pure post-stage amplifiers. The setup of professional amplifiers is simple, and there are often only power switches and output level adjustment potentiometers (or step attenuators) on the panel. However, due to the actual needs of professional power amplifiers, it is often possible to work in a two-channel state, or to become a mono amplifier after "bridging", so the professional power amplifier is often provided with a "bridge" switch. There are many models of home amplifiers that are "combined" amplifiers with preamplifiers. This combined amplifier has many functions, often with audio source selection, monotonic control, and multiple audio input interfaces.
From the working state of the amplifier, the professional power amplifier pays more attention to the efficiency of the amplifier, so most of them are class AB amplifiers. Some household amplifiers use Class AB amplifiers, or "high-bias AB" amplifiers, some use Class A amplifiers, and some also use dynamic biased "Super Class A" amplifiers. From the perspective of output power, professional power amplifiers tend to have large output power, and a single output power can reach more than 1000W. The rated output power of household amplifiers is mostly below 200W.
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