Frequency is the new range FLI subwoofer range - incorporating cool, contemporary FLI styling whilst using unique materials to harness the latest subwoofer technology. FLI woofers offer a formula that deliver a wide frequency range resulting in hard hitting, fast bass whilst the natural grey, large roll rubber surround and 1 piece cone assist with maximum excursion, giving the bottom end slam. FLI subwoofers are used in all FLI acoustically measured enclosures.