PS7a The full frequency column speaker adopts the arc-shaped low diffraction cabinet design that best conforms to acoustic characteristics. It consists of two 4.5” neodymium mid-low drivers and four 1-inch silk film tweeters. The tweeters are in line array construction but coaxial to the woofers, making the speaker extra compact, but the sound is soft and smooth. The cabinet is made of aluminum alloy die-casting material. It efficiently utilizes the space inside to achieve the maximum volume. High density casting materials have excellent mechanical strength and impact resistance characteristics. Bright piano black paint finishing effectively prevents rust and moisture.