Melacoustic architectural sound-absorbing and soundproofing panels, composed of lightweight flame-retardant porous melamine material and various damping combinations, work simultaneously to absorb and isolate sound. They effectively capture sound waves above 200Hz with a capture rate of over 95%, and also provide good blocking effects for low-frequency sounds at 200Hz. With exceptional secondary processing capabilities, these panels can be applied in various forms for acoustic treatment in venues such as hotels, schools, hospitals, sports arenas, and auditoriums, as well as for noise reduction in factory equipment and air conditioning ducts.