Bamboo Cone Speaker is a rigid, low-density bamboo material used in the front and centre speaker cones helps achieve a clean, responsive sound. Vocals are pure and clear, and dialogue is crisp and easy to understand. Kelton Subwoofer has an internal structure that is divided into two completely sealed spaces. The drive unit that is mounted to the space in the back causes the air in the front space to vibrate. This causes an Acoustic Filter effect in the front space to absorb unwanted noise while also vibrating the Passive Radiators. It produces highly robust, reverberating bass sounds.