Pharma cold chain HS code analysis

List of catalogs of this article:

• 1,Pharma cold chain HS code analysis Top Ten Brands of Audio
• 2, Home Sound System Layout
• 3, basic composition of automotive audio system

Top Ten Brands of Audio

The world's top ten audio brands are: AVANCE, AcousticEnergy, KEF, ELAC, Zunbao, JBL, Tianlang, Dana, ATC, Bowers & Wilkins. AVANCE AVANCE is an audio brand founded in Denmark in 1973. It is known as a synonym for Danish audio.

Top ten audio brands: B&W, Dynaudio Dana, JBL, Dr. Bose, TANNOY Tianlang Audio, KEF, Klipsch, DALI, Jamo Zunbao, ELAC.

Founded in 1925 in the United States, Shure is a leader in the microphone and audio electronics industry, one of the top ten microphone brands, and a multinational enterprise, Shure Asia Co., Ltd. Founded in Japan in 1946, SONY SONY is a leading global high-end imaging brand, a world-renowned brand, and a leader in the information technology industry. Sony (China) Co., Ltd.

Tianyi Tianyi Audio is an audio brand with a history of more than 30 years. It is loved by many audiophiles with its own brand and OEM and ODM. Tianyi Audio'sThe products cover many fields such as stereo, multi-channel equipment, floor speakers and Bluetooth speakers, and almost cover all kinds of products in the audio market.

home sound system layout

1. Method: divide the length of the room into three equal parts (three), the speakers are placed at one-third of the length (1), and the interval between the two speakers is 0.7 times the length of the second of the room (seven) . It is best to have a slight inward projection angle for the speaker, but it is also acceptable if it is not projected inward. The listening position should not be attached to the back wall.

2. In the professional logic system, the left and right speakers should be placed at a 45-degree angle with the listening area. This arrangement can best give full play to the mixing effect of the surround sound channel, and this arrangement can also replay ordinary stereo music well.

3. The most typical swing method is the "equilateral triangle method". This swing method requires a pair of speakers to be lined up facing the listener and placed on both sides of the monitor (or computer table), and the distance between the two speakers should be 1 to 2 meters.

Basic composition of automotive audio system

1. The composition of automotive audio system is: power amplifier: amplifier for short, which refers to an amplifier that can produce maximum power output to drive a load under a given distortion rate. Speaker: It is a very commonly used electroacoustic energy converter, which can be seen in electronic and electrical equipment that makes sound.

2. Four-way amplifier: it is mainly used to push two pairs of coaxial speakers or set speakers to the front and rear doors, and the power is generally moderate.(4) Five-way amplifier (one amplifier can push the whole set of audio): four of them are used to push medium and high-frequency speakers, and the other one is used to push low-frequency speakers, and its power is relatively small.

3. At present, most of the domestic car audio systems are used as sound sources in six models such as casstte, CD, VCD, MPMD and DVD. Among them, the sound quality of the CD player is relatively pure: the capacity of the MP3 and MD players is relatively large; the image of the DVD player is relatively clear.