British HINARI brand audio, in 1360 ~ 1500 yuan. The machine has remote control, laser, recording, radio, TV sound, surround sound and other functions. The appearance is simple and detailed, the frequency response of the power amplifier is 60HZ ~ 20KHZ, the signal-to-noise ratio is greater than 85DB, the channel separation is 70DB (1KHZ), and the effects of laser, radio, and recording are better. But compared with the high-end audio, the sound is a little dry, and the sense of hierarchy is poor, especially when playing large dynamic VCD program sources such as "1812" and "Jia Luo Dance". This article improves the machine. After the improvement, the transaction is slightly better than the 4000 ~ 5000 yuan couples in the mid-range suit. The improvement experience is now introduced.
The size of a pair of sealed boxes equipped with the original machine is 240MM * 450MM * 140MM. The plate is made of 10MM thick MDF. The back of the box has a sound absorbing cotton. The sound box is very rugged. The power will be a little higher. The sound of "porphyria" is emitted. The frequency division is only served by a 4.7UF electrolytic capacitor. According to the size of Figure 5-140, please make a pair of inverted speakers. The 28MM thick hard board (high density board is also acceptable) is used around the box board. The 30MM * 30MM wooden strips are used as ribs and reinforced with wood screws and latex to ensure firmness and good air tightness. The front and rear boards are made of 24MM thick multi-layer boards, and a fiber board is glued on the side near the inside of the box, and the concave side faces the inside of the box, and
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