Weak current College】 【public radio power amplifier and speaker power configuration solution.

Amplifier and speaker configuration aspects involved, such as amplifier brand, power tube type choice and loudspeakers low sensitivity should configure what kind of power amplifier. Amplifier and speaker's specific configuration, in General and design staff experience, hobbies, listening habits and other factors, it is difficult to find a unified standard.

Sometimes we encounter some users or designers to save expenses often speaker configuration of smaller power amplifier, some users to the so-called "power reserve sufficient" to the speaker configuration is high-power amplifier. Obviously, this is not appropriate. It is important that this configuration will cause damage to the device. The power amplifier and speaker configuration, the power amplifier power is key, that is, the power amplifier power determines principles should be unified.

We all know, acoustic design, based on a series of calculations required to determine the sound power, and then determine the speaker power amplifier power, but how does the power both to achieve best bets and matching?

First, in the auditory domain 20Hz ~ 20kHz, truly intensive energy music signal typically in low and high frequency band, and the energy of a medium, and low frequency energy of 1/10. Therefore, the General sound treble damages of power than the bass Horn much lower, with a view to achieving a balance; and bass amplifier is like a current modulator, its control of the input audio signal, the output current of different sizes to the speaker, the sound of the occurrence of different sizes, impedance, for nominal power 200W power amplifier achieve 400W or several times of output is actually very easy, just power amplifier distortion (THD) will greatly increase, resulting in distortion of the main, the low-frequency signals in high frequency harmonics, the greater its distortion, high frequency, the greater harmonic energy, high-frequency distortion signal will be together with the high-frequency signal into music treble head, which is why small power amplifier pushes big speakers occur burning treble head. But in many people's concept, as long as the amplifier power, it is possible to burn the speakers. Although some of the power amplifier is not distorted, but due to device configuration intentioned distortion may be in use from time to time, when the distortion has lost its significance. Moreover, since the consumer experience and quality constraints, the power amplifier distortion tends to be ignored.

Secondly, the power amplifier and speaker power configuration and the target loudness and the use of occasions have certain relations. To a certain target loudness, you should let the music signal dynamics in each piece of equipment can be fully guaranteed, if amplifier power is too big, and its gain loudness setting is small, has reached the requirements, but when the amplifier gain limits the dynamic range of the signal. Therefore, the power amplifier power must not be too large; otherwise, since waste costs, introduces loudness and dynamic music and sound impossible overload of trouble. Based on past experience, language, music venues and dynamic sound of disco etc are differentiated. There are General PA site undulations small signal, does not require amp long or will soon provide a large current to the speakers, amplifier power should be better than asking powerful large dynamic loudspeaker sites of power to small; in addition, the so-called "power reserve" should also be directed at the speaker, it is worth noting that the amplifier's speakers selected must be decided, should not have "power reserve" concept to configure power amplifier.