DESC: Audio for the Connoisseur: Energys CF-50 floorstanding loudspeaker. A single 1 tweeter and three 5.5 woofers combine to deliver 2.5-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.