The Unicorn of Subwoofers

Z4 competition subwoofer

In early 2005 the first ever iteration of the Z motor was launched. It forever changed the way people thought of a high-performance subwoofer and pushed the limits of car audio to new extremes. Over the years, many versions of Zs have been produced and this spirit of experimentation has driven us to constantly improve and innovate.

There have been a couple different iterations of the Z4 over the years, and due to the limited number of pieces that have been produced it has gained an almost mythical status in the subwoofer world. In its current form, the Z4 is an 18 lens grade 52 neodymium open motor design. By increasing the surface area of the voice coil, size of the magnetic gap, and its heat dissipating abilities, the Z4 is able to be driven just as hard as the Z3, but with increased long-term high power handling.

The USA steel motor parts are machined in our hometown of OKC, and all the moving parts are USA made from the finest materials and manufacturing methods available.

The current Z’s feature several design improvements over previous models. We were able to overcome structural saturation levels and increase peak and total flux levels by allowing more energy to flow through our magnetic lens architecture via more efficient flux paths, closer alignment of the lenses and converging flux lines.

The Free Flow Cooling System was improved by incorporating longitudinal pole vents to increase airflow to the coil former. Then we Increased thermal mass and used heat absorbing coatings in target areas to aid in long-term heat dissipation.

We also implemented geometric changes allowing for increased maximum excursion capability and a wider range of system design configurations.

The Z’s striking cosmetics feature a black oxide coating combined with red anodized accents. The motors are also adorned with custom CNC engraved designs, and every motor is engraved with its production number, making each sub a one of a kind.

You’ll notice the standard TS parameters are missing for the Z subs. This omission is on purpose because each Z is custom built torder which makes for Zillions of possible parameter sets making one static set of specs very prone to inaccuracy. The reason we build Zs CTO is it gives a system designer the utmost freedom to design for their specific application.  The collection of Z subs are the moZt astounding sounding, moZt aurally accurate, and absolutely the moZt loudest subwoofer ever produced.

The Z Series subs also feature our Evolution Subwoofer Package (ESP).  ESP equipped drivers sport larger diameter suspensions and deeper frames than standard subs and exclusive surround and cone designs. ESP subs are truly built to maximize performance in their designated size class.

The Z Series comes standard with an oversized dry finish black composite dust cap, red logo, and treated pulp cone, but it can be optioned out with custom suspension configurations, alternative composite dust caps, composite cones, powder coated frames, and a multitude of logo options to give your sub a personalized look and/or added performance for a specific application.

Learn more about the ESP features at The DDownlow.


Model Z412 (ESP) Z415 (ESP) Z418 (ESP) Z421
Driver Size 12" 15" 18" 21"
Watts RMS 1500 - 6000 1500 - 6000 1500 - 6000 1500 - 6000
Peak Power 12000 12000 12000 12000
VCD 4 4 4 4
Impedance D1 / D2 D1 / D2 D1 / D2 D1 / D2
Piston Dia - in 11 14 1/4 15 1/2 18 1/4
Frame OD - in 13 3/8 16 5/8 18 1/4 21 5/16
Frame OD w/Gasket - in 13 1/2 16 3/4 18 7/16 -
Mounting Diameter - in 12 3/16 15 3/16 16 5/8 19 1/4
Mounting Depth - in 11 1/2 12 1/8 12 7/16 13 1/8
Motor Diameter - in 10 10 10 10
Motor Depth - in 5 5/8 5 5/8 5 5/8 5 5/8
Price (USD) Contact an Authorized Dealer Contact an Authorized Dealer Contact an Authorized Dealer Contact an Authorized Dealer

Express yourself with your choice of logo style and color plus custom dust cap and cone

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