DESC: Audio for the Connoisseur: Energys CF-70 floorstanding loudspeaker. A single 1 tweeter, single 5.5 mid-range driver, and dual 6.5 woofers combine to deliver full-range, 3-way audio with the flat, on-axis frequency response and low resonance for which Energy audio is known. While Convergent Source Module technology allows the tweeter and mid-range driver to operate as a single source for enhanced dispersion, Ribbed Elliptical Surround technology dramatically reduces distortion and improves fidelity.