Undertone

About the Undertone

The Zu Audio Undertone is a high-performance subwoofer designed to deliver deep, powerful bass with state-of-the-art sound quality at a reasonable price. It features a down-firing, sealed 12-inch Eminence LAB-12 driver, powered by a Hypex UCD 400-watt amplifier. The subwoofer includes active signal processing with extensive tunability options such as volume control, full phase control including a 180-degree flip, a parametric EQ frequency dial, gain for the PEQ frequency, and a low pass filter. It supports line-level inputs (RCA left and right summing), sub line-level input, and speaker-level inputs via 5-way binding posts. The design includes a DSP bypass switch for integration with external signal processing while utilizing the powerful amplification. The unit measures 25 inches in height (with spikes), has a 15 x 15 inch footprint, and weighs approximately 68 pounds. Its frequency bandwidth ranges from 14 Hz to 80 Hz, making it suitable for deep bass reproduction. The subwoofer is noted for its ability to be finely dialed in to match various systems, providing about 85-90% of the deep bass quality of Zu's Definition Mk.IV loudspeakers but at a more accessible cost. The electronics and driver are designed and made in the USA, with the amplifier module manufactured in the Netherlands. Overall, the Undertone offers a powerful, tunable, and high-quality bass foundation for audiophile systems.