Audio entry speaker

　　Many friends believe that they all think that any product they see is just a speaker before they have access to audio.

　　Speakers are basically composed of three parts: speakers, crossovers, and cabinets.

　　According to the number of speakers, it is divided into two units and three units. Another is to make the tweeter and the woofer into one, called a coaxial unit, which looks like one unit from the outside, but is actually still two units.

　　The frequency divider, as the name implies, divides the frequency band [20--20000Hz] of the audible sound into several frequency bands and sends them to the corresponding speaker units respectively. According to how much the frequency band is divided into, the high and low frequency bands are called two-way frequency, and the high, middle and low bands are called three-way frequency, and so on.

　　The box body is generally made of logs or medium density boards. According to the box structure, it is divided into airtight boxes (without phase reversal holes, the air inside the box is insulated from the outside) and phase reversal boxes (with phase reversal holes). There are also some uncommon box structures on the market: labyrinth, exponential, negative resistance, horn, etc.

　　According to the scope of use of speakers, it is divided into:

　　Professional box - used for sound reinforcement in performances, halls, halls, venues, and halls

　　Monitor Box - Professional Monitoring for Various Recording Institutions

　　Civil box - according to the placement of speakers, it is divided into bookshelf box and floor box. Bookshelf boxes are mostly two units, two-frequency structure, and are mostly used in rooms within 20 square meters. Floor boxes are mostly multi-unit, multi-frequency structure. Use more than 20 square meters

　　Speaker performance indicators:

　　General speakers will indicate their application parameters, the common ones are:

　　Power: Generally measured in W or VA, the common one is nominal power (rated power, undistorted power) refers to the maximum input power under the condition that the nonlinear distortion does not exceed the standard range of the speaker. He is the normal working power of the speaker, and it will not be damaged if it works continuously for a long time.

　　Sensitivity:

　　The sound pressure produced at one meter from the reference point, expressed in decibels (db). The higher the sensitivity of the speaker, the louder it is under the same driving power, which is very important when using a low-power amplifier.

　　impedance:

　　It refers to a pure resistance presented by the speaker when the audio signal is added to the speaker input. The common ones are 4 Euros and 8 Euros, and there are also 3 Euro and 5 Euro systems abroad. When using it, pay attention to match the output impedance of the power amplifier. In particular, the matching of the amplifier to the speaker impedance is particularly important.

　　Frequency Range:

　　Generally speaking, it refers to the frequency reproduction range of the speaker when the high and low ends of the audio range drop by negative 3 db. Naturally, the wider the better, the high-end HI-FI speakers can achieve 20000HZ or even 30000HZ playback, but the low frequency band is limited by the speaker diameter and the volume of the box, so it is not easy to achieve 20HZ , and the low frequency of the bookshelf speakers will be even worse.

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