Product Name: Directional Museum Exhibition Stereo Amplifier Loudspeaker Model NO.: PV-30 THD: <0.005% Monitor: Without Screen Certification: CE, RoHS, FCC Application: Exhibition/Museum/Restaurant Speaker Material: Plastic Speaker System: Stereo Operation Mode: Wire / Remote Control Activity: Passive Hi-Fi: Not Hi-Fi Noise: <95dB Material: Acrylic Trademark: Lisen Echo Transport Package: Wooden Package Specification: 4pcs in one carton Origin: China Product Description Directional Museum exhibition stereo amplifier loudspeakerproduct description of Museum Amplifier:Museum Amplifier is also known as sound hoods, Museum Amplifier. Museum Amplifier is mainly used for narrow angular propagation of sound and can focus the sound like a beam of a flashlight. It is based on the optical properties of the parabolic focus-the principle that any reflected light passing through the parabola is parallel to the axis of symmetry of the parabola.Adaptation:MuseumAmplifier is used on many occasions such as museums, exhibition halls, science museums, etc. The main feature is that the sounds played by each area cannot interfere with each other. The sound quality of the double parabola dome is the clearest and free from outside interference.Museum AmplifierFeatures:Museum Amplifier placed in the focus of the parabolic transparent cover so that the broadcast sound is concentrated directly below, to maximize the focus of the sound;1. Full-range sound radiation and strong bass;2. Ceiling/wall/ pavilion single point installation.3. Clear sound quality and strong stereoscopic effect;4. The material is transparent, beautiful in appearance and convenient to install;Products Types:A normal play type, B card or U disk play type, C infrared type. Three functional products are available to buyers and sellers.Special Tips:Museum Amplifier output horn, dome reflector, power amplifier, black top cover, DC power supply, hook, Museum Amplifier cable, audio cable, and package. Scope: Museum Amplifier are suitable for repeating different presentations in multiple specific areas. The sound-receiving enclosure speaker transmits the sound to each visitor in this area so that visitors in front of different exhibitions can individually enjoy the audio and video content of the exhibits in front of them without being disturbed by the sound of the adjacent exhibits. Precautions for use in museums, science museums, art galleries, exhibition halls, theme parks, restaurants.*Do not touch the space cover*The hook joint is fixed firmly to prevent falling off*Do not adjust the amplifier knob frequently*The height of the space cover is preferably 2.3-2.5 meters from the ground.*For the best audition, please stand in the center of the space cover