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Speakers are also called "horns". It is a very commonly used electro-acoustic transducer, which can be seen in sound-producing electronic and electrical equipment. A speaker is a transducer device that converts electrical signals into acoustic signals. The performance of the speaker has a great influence on the sound quality. The speaker is the weakest component in the audio equipment, and it is the most important component for the sound effect. There are many types of speakers, and they vary widely in price. Audio electrical energy produces sound through electromagnetic, piezoelectric or electrostatic effects that cause its cone or diaphragm to vibrate and resonate (resonate) with the surrounding air.

The special line generally refers to the door-to-door transportation mode of Shuangqing、 similar to express delivery.

However、 air transportation is only the transportation from one airport to another、 which requires separate application for customs declaration and clearance.

In general、 small goods are more likely to choose special lines. Preferential price for large goods transported by air.

Air freight price calculation method:

（1） Air freight charge weight

According to the provisions of the airline、 when the cargo is small and heavy、 it shall be calculated according to the actual weight; In case of large volume and small weight of goods、 it shall be calculated by volume. A batch of goods consists of several different goods、 including light goods and heavy goods. The billing weight shall be the total gross weight or total volume weight of the whole batch of goods、 whichever is higher.

（2） Air freight price calculation and cost category

1. Rates;

2. TRANSPORTATIONCHARGES;

3. The airlines charge the international air freight according to the three regional rates set by the International Air Transport Association;

4. There are four main types of air freight: (1) general freight; (2) Freight rate of special goods or designated goods; (3) Class freight rate of goods; (4) Freight rate of container cargo

（3） Minimum freight

The minimum freight that the airline can accept for handling a batch of goods、 regardless of the weight or volume of the goods、 and the minimum amount that should be charged for transporting a batch of goods between two points. Different regions have different minimum freight rates.

（4） Other provisions on air freight price calculation

All the different air freight rates and charges have the following common points: the freight rate refers to the transfer from one airport to another. It is only applicable to a single direction; Other additional costs are not included. Such as picking up、 customs declaration、 delivery and warehousing expenses. Freight rates are usually published in local currency. Freight rates are generally calculated in kilograms or pounds. The freight rate in the air waybill is based on the applicable freight rate on the date when the air waybill is issued.

As long as it is not liquid、 dangerous goods、 or goods whose volume is not too long or too high、 they can generally be transported by air、 but the air transportation is to pick up goods at the airport、 while the international express delivery is to deliver goods directly to the door