Characteristics of AK Series are medium and large size compression driver, powerful magnet power, surround and low pitch unit for enduring such strong power, and deep and punching sound naturally expressing the whole frequency without biased on a certain frequency. Detailed network design made under tests for a long time provides excellent acoustic sound performance without getting lost in rich low pitched sounds. This allows audiences to immerse in the natural and clear performance. In addition, an enclosure made with plywood for specially bonded speaker is our special technology for controlling unnecessary resonance from speaker’s overtone.