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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 operation mode of shipping to Amazon warehouse in Europe is as follows:

Air transportation+local delivery at the destination、 the freight company collects a certain amount of goods、 the first flight package board flies to the city near the Amazon warehouse in Europe、 Germany、 and the customs clearance company of the freight company completes the customs clearance、 and then the express company delivers the goods to the warehouse; This method is less effective than the first one、 but the freight rate is economical.

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.

DHL、 compared with the other three modes of transportation、 has the greatest advantage in terms of timeliness、 and the freight is relatively cheaper than UPS and TNT.

FEDEX and freight are the cheapest of the four、 but the aging is also the slowest. Generally、 the normal aging is about 4-7 working days.

UPS and time efficiency are not much different from DHL、 but the price is slightly higher、 and the corresponding additional charges are also quite large.

TNT and cost are the highest among the four types of express delivery、 and the price advantage is relatively obvious for Australia、 the Middle East and Western European countries alone.

DHL: Small goods have advantages in global price timeliness.

FEDEX.

UPS: Customers with high timeliness requirements can choose this mode、 which is as fast as DHL.