Yuhai piezo materials include : hard piezo material, soft piezo
material and lead free piezo material
Soft piezo
material exhibits: larger piezoelectric constants, higher permittivity, larger
dielectric constants, higher dielectric losses, larger electromechanical
coupling factors, low mechanical quality factors, a lower coercive field, poor
linearity, and is easier to depolarize. The ideal application of soft piezo materials is sensing needs. Yuhai soft
pizeo materials are PZT-5, PZT-5H, PSnN-5 and PLiS-51.
Hard piezo
material exhibits: smaller piezoelectric constants, lower permittivity, smaller
dielectric constants, lower dielectric losses, smaller electromechanical
coupling factors, high mechanical quality factors, a higher coercive field,
better linearity, and is harder to depolarize. The ideal application of hard piezo materials is high power transducer needs. Yuhai hard pizeo materials are PZT-4, PZT-8, PCrN-4 and PBaS-4.
Yuhai company developped lead free piezo material BaTiO3 and apply for the Chinese Patent in 2011, to meet the needs of environmental protection in today's society.
Piezoelectric ceramic material
Properties and Classification
General description of material properties
Material Code
Properties
Application
Soft PZT ceramic
PZT-51
Characteristics:
larger piezoelectric constants, higher permittivity, larger dielectric
constants, higher dielectric losses, larger electromechanical coupling
factors, low mechanical quality factors, a lower coercive field, poor
linearity, and is easier to depolarize.
low-power ultrasonic transducers
PZT-52
low-frequency sound transducers
PZT-53
applications with high g coefficient, for example,
PZT-5H
microphones,vibration pickups with preamplifier
PLiS-51
low-frequency vibration measurements
PMgN-51
Hydrophones, transducers in medical diagnostics
PSnN-5
Actuators
Hard PZT ceramic
PZT-41
Characteristics: smaller
piezoelectric constants, lower permittivity, smaller dielectric
constants, lower dielectric losses, smaller electromechanical coupling
factors, high mechanical quality factors, a higher coercive field,
better linearity, and is harder to depolarize.
PZT-42
High-power acoustic applications
PZT-43
Hydroacoustics, sonar technology
PZT-82
piezomotor
PCrN-4
PBaS-4
Lead free piezo ceramic
BaTiO3
Characteristics: Low density, low curie temperature, lead free.
Ultrasonic transducers suitable for low-temperature underwater, for example ultrasonic transducer in fishfinder
Piezoelectric Material,Piezo Ceramic Element,Piezo Electric Cylinder ,Piezo Sphere Zibo Yuhai Electronic Ceramic Co., Ltd. , https://www.yhpiezo.com
Lynx Box Exchange Group: 488173725
Magic box simple solution to connect external audio, power amplifier method
Recently, I have seen many netizens worry about this issue, but also to buy a dedicated extension cable, which is actually very unnecessary. This is not only a waste of money, but also affects the sound quality.
In fact, we can use the video cable that comes with the box to solve the problem, as shown below: 
Small share, I hope to help you.
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So easy box connected external audio, amplifier problems Tip: HDMI and video cable are plugged into the box, because the interface is relatively close, it will be more difficult to insert, so you can manually strip the HDMI cable with a utility knife, one point is enough, does not affect the use.
Yellow is the video head, red is the right channel, and white is the left channel.
Seeing that most of the machine friends here should know, yellow regardless of it, the red and white directly corresponding to the sound above it OK. My own box is - HDMI connection TV - audio head to connect the speakers, so do not interfere with each other, especially with the speaker to watch movies, listen to music, much better than the TV effect, very comfortable.
Some UF speakers are 3.5 one-on-one audio cables
If the speaker does not have a lotus head input, you can only buy the extension cable, but this box is not much