audioquest thunderbird zero biwire comboHigh end speaker cable with ZERO technology and dedicated BiWire separation Signal transfer without compromise The AudioQuest ThunderBird ZERO BiWire COMBO is a speaker cable designed for the highest end audio systems, where precision, control, and tonal consistency are critical. This configuration combines the ZERO cable for the mid high range with the BASS cable for low frequencies, creating a BiWire solution optimized to maximize speaker