Friends who are new to the speaker are generally interested in the speaker unit used in the speaker, what kind of tweeter is used, and what kind of mid-woofer unit is particularly concerned. That's right, the effect of the unit on the sound of the speaker is really great, but it is not all the factors that determine the sound of the speaker. The box that is usually regarded as the speaker's face value, in fact, is not as simple as you think - a shell placed in the unit, good or not is the second consideration for the box. Factors, the realization of acoustic optimization is its main responsibility. Let's talk about the impact of several aspects of the cabinet design on the sound of active speakers.

Don't just focus on the unit box, but it’s also very knowledgeable.

First let's look at the material of the box. Many entry-level users are estimated to have experience with Amway wooden cabinet speakers, but if you ask why, they may not be able to answer them. It is likely that most of the speakers on the market are made of wood. This is of course a fact, but it does not mention the nature of the problem, and there may be some deviations in the understanding of “wood”. Most of the so-called wooden speakers are not pure solid wood cabinets as you think, because in terms of solid wood, wood that can naturally meet the characteristics of density uniformity required for the manufacture of cabinets is extremely rare, and the cabinets of solid wood cabinets also have However, the price is also very touching, so a small amount of solid wood can be used as a cabinet decoration, and the whole solid wood is rarely used now.

MDF board for speaker cabinet

The current wooden speaker box materials are basically MDF boards, which are medium density fiberboards, referred to as MDF boards. MDF is a kind of artificial board made of wood fiber or other plant fiber, which is crushed, separated by fiber, dried and then coated with urea-formaldehyde resin or other suitable adhesive, and then hot pressed. Its density is generally 500-900 kg / cubic meter, and the thickness is generally 5-30 mm.

MDF board can be used as box material, and various veneers can be designed according to design requirements.

The MDF board has good rigidity, high density and good acoustic properties. We know that a wooden box-like instrument like an acoustic guitar requires that the box must be able to enhance the vibration of the string to create a greater resonance. The speaker cabinet is just the opposite, requiring the cabinet to not follow the unit. Vibrate and vibrate to avoid distortion of the cavity resonance. The MDF board is the material of choice for speaker cabinets because it meets the acoustic needs of speaker production and is low in production cost and easy to process. Moreover, the surface of the MDF board is flat and easy to apply on various veneers, so we can see that the wood grain on the speaker is basically attached, one is good-looking, and the other is to enhance the moisture resistance of the MDF board.

Audimaxim master speaker with solid wood veneer

There is another detail on the speaker cabinet that we may not have noticed is the inverted phase hole (the fully enclosed cabinet has no inverted phase). This hole can sometimes be a round hole, and sometimes it can be a long seam, but the effect is the same. When the speaker works, it will drive the air to send two sets of sound waves. The two sets of sound waves have the opposite phase. At this time, a sound tube is installed inside the speaker, which can reverse the phase of the sound emitted by the speaker, and then the speaker The sound waves emitted before are superimposed on each other to achieve a greater sound pressure.

The appearance of the inverted tube on the speaker (the inverted hole opens at the front of the speaker)

The lowest frequency sound of the speaker is radiated to the listening position through the inverted aperture opening, and all other frequencies are radiated by the speaker unit. When the frequency is very low and the sound pressure level is high, a large amount of airflow will repeatedly enter and exit through the conduit opening on the casing. Therefore, the key to the design of the inverted phase hole is to enable the air to efficiently enter and exit unimpeded when the volume is large and the speed is high, and the turbulent noise is not generated in the inverted tube and the nozzle. If the air flow in the inverted well is blocked, then audible low frequency distortion and low frequency loss are immediately produced.

We see that some inverted holes are set to the back of the speaker, some on the front of the speaker, some on the bottom, and some are special shapes, but the position of the inverted hole in the speaker is not important, because it is relative to The wavelength of the very low frequency sound waves radiated by the inverted phase holes, the size of the speaker is negligible. For example, the wavelength of 50 Hz has been as long as 6.8 meters, and the thickness of the general box may not exceed 60 cm, so the low-frequency sound waves can be completely diffracted, and the phase difference caused by the size of the cabinet is small enough to be inaudible to the human ear.

Although the position of the inverted hole is not important, the speaker has to talk about the aesthetics of the design in addition to the sound. It is not just a hole in the box. The clever design can often add a product.

Regarding the cabinet of the active speaker, we talked so much this time. This kind of presence is far less dazzling than the speaker unit. It can be said that it is a behind-the-scenes feat. A good box is an important factor to ensure that the speaker can make a good sound. Together with the speaker unit, it constitutes the overall sound of the speaker. Nothing.

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