Discover the Power Tuned Z421, an impressive 21-inch subwoofer from DD Audio. Since its first generation in 2005, this subwoofer has changed the way we think about high-performance bass and continuously set new standards. With its powerful neodymium motor, the Z421 sets the benchmark for strong drives. Built and developed in the USA, it combines high-quality materials with innovative manufacturing methods. Numerous structural improvements and geometric changes allow for increased maximum excursion and a variety of system configurations. Its outstanding design is immediately recognizable, and each piece is individually numbered. With optional customizations, you can make your Z421 unique – it doesn't get any better than this.

Features

• 53cm (21") Subwoofer including DD Audio Merchandise Package!
• Power Handling (RMS): 6000 Watts
• Peak Power Handling: 12000 Watts
• Voice Coil Diameter 4 inches (100mm)
• Impedance Options:
• Dual 1 Ohm
• Dual 2 Ohm
• Patented Neodymium Magnet System
• Lossless Linear Suspension
• Ribbed Foam Surround
• Magnet Protection Cap including grille over the pole vent
• Aluminum Die-Cast Basket

In early 2005, the first generation of the Z motor was launched. It forever changed the way people thought about a high-performance subwoofer and pushed the boundaries of car hi-fi to new extremes. Over the years, many versions of the Z motor have been produced, and this spirit of experimentation has driven DD to constant improvement and innovation.

The Z4 series uses an impressive open neodymium motor with 18 lenses of grade N48, equipped with an even more powerful motor than its smaller Z3 series siblings. The Z4 series has the strongest neodymium drive in the world! It doesn't get any better!

The steel motor parts from the USA are machined in DD Audio's hometown OKC, and all moving parts are made in the USA from the best available materials and manufacturing methods. The current Z models feature several structural improvements over earlier models. DD was able to overcome structural saturation values and increase peak and total flux levels by channeling more energy through our magnet lens architecture via more efficient flux paths, tighter lens alignment, and converging flux lines.

The free-flow cooling system was improved by installing pole vent valves to increase airflow to the voice coil former. Then DD increased the thermal mass and applied heat-absorbing coatings in target areas to support long-term heat dissipation. Additionally, DD made geometric changes that allow for increased maximum excursion and a wider range of system configurations.

The striking look of the Z is characterized by a black oxide layer combined with red anodized accents. The motors are also adorned with custom CNC-engraved designs, and each motor is engraved with its production number, making every piece unique. You will notice that the standard Thiele-Small parameters for the Z series are missing. This omission is intentional, as each Z is built to order, enabling zillions of possible parameter sets, making a static set of specifications very prone to inaccuracies.

The Z series subwoofers also come equipped with the Evolution Subwoofer Package (ESP). Drivers equipped with ESP feature larger diameter suspensions and deeper frames than standard subwoofers, as well as exclusive surround and cone designs. ESP subwoofers are truly built to maximize performance in their respective size class.

The Z series comes standard with an oversized black composite dust cap in dry construction, a red logo, and a treated paper cone, but can optionally be equipped with a custom suspension configuration, alternative composite dust caps, composite cones, powder-coated baskets, and a variety of logo options to give your subwoofer a custom look and/or additional performance for a specific application.