It provides a a lot better physical relationship towards the voice-coil, meaning much more with the coil’s motion Vitality is transferred into the diaphragm by way of the Harmony Ribs around the Heart.ซับวูฟเฟอร์ลำโพงติดตั้ง ไม่มีแอมป์ในตัวซับวูฟเฟอร�