Frequency response
The frequency characteristic of the sound system is usually described by the ordinate of the decibel scale representing power and the abscissa of the logarithmic scale representing the frequency of the frequency response curve. When the sound power is 3dB lower than the normal power, this power point is called the high-frequency cutoff point and low-frequency cutoff point of the frequency response. The frequency between the high-frequency cut-off point and the low-frequency cut-off point is the frequency response of the device; the curves of sound pressure and phase lag with frequency change are called "amplitude frequency characteristics" and "phase frequency characteristics", collectively called "frequency characteristic". This is an important indicator to examine the performance of the speaker. It has a direct relationship with the performance and price of the speaker. The smaller the decibel value, the flatter the frequency response curve of the speaker, the smaller the distortion, and the higher the performance.
In theory, a frequency response of 20 to 20000 Hz is sufficient. Sounds lower than 20Hz, although inaudible, can be perceived by other human sense organs, that is, the so-called bass strength can be felt, so in order to perfectly play various musical instruments and language signals, the amplifier must achieve high-fidelity goals. Replay each harmonic of the tone. Therefore, the frequency band of the amplifier should be expanded, the lower limit should be extended below 20 Hz, and the upper limit should be increased to above 20,000 Hz. The method of expressing the frequency response of the signal source (radio head, recording base, CD player, etc.) is different. For example, the frequency response of the FM stereo broadcast specified by the European Broadcasting Union is 10 / -2dB at 40 ~ 15000Hz, and the minimum frequency response specified by the International Electrotechnical Commission for the recorder is 10 / 2.5 at 10 ~ 2.5Hz / -4. 5dB (common band), the actual achievable indicators are significantly higher than this value. The upper limit of the frequency response of the CD player is 20000Hz, and the low frequency end can be very low, only a few hertz, which is one of the reasons for the good playback quality of the CD player.
About ice cube tray molds:
In our daily life,ice is a common thing,especially in summer,people usually put the ice into juice or water to let them cooling,and also it can keep food fresh like fruits or meat.People generally use plastic ice mold to produce ice.But sometimes if the plastic ice mold used for a while,it will broken.So,is it anything can instead of plastic ice mold to produce ice?
Yes,we can use silicone ice mold instead of it.Silicone ice mold is durable in use,and has many shape to choose,you can do your own design to produce other beautiful ice.
Choose Silicone Ice Molds,you can get lots of fun when you are drinking juice or water.
Ice molds introduction:
1.Product name: Ice Cube Trays ,Silicone Ice Trays,Round Ice Cube Trays,Novelty Ice Cube Trays, Ice Block Moulds , Ice Ball Mold
2.Place of origin:Guangdong China
3.Color:any pantone color
4.Logo:Printing,debossed,embossed
5.MOQ:500pcs.
6.Package:1 pcs/opp,customized design is available.
7.Design:Customized/stock
8.Certification:FDA,LFGB,SGS,ROHS,etc.
9.Usage:Use in ice producing
10.Silicone ice molds photos for reference.
Silicone Ice Molds
Silicone Ice Molds,Ice Cube Trays,Silicone Ice Trays,Round Ice Cube Trays,Novelty Ice Cube Trays,Ice Block Moulds,Ice Ball Mold
OK Silicone Gift Co., Ltd. , https://www.oemsiliconegift.com