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Hertz SX 300D

SPL Show Series 12" dual 2-ohm voice coil component subwoofer — designed for SPL competition

Item # 301SX300D1

When Hertz speakers made their debut in 1998, they quickly distinguished themselves with their award-winning...

Read more from Crutchfield writer, Bob B.

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About the Hertz SX 300D

Experience and expertise

When Hertz speakers made their debut in 1998, they quickly distinguished themselves with their award-winning performance and design innovations. They created the SPL Show Series for competitors who require high power handling under extreme conditions. The SX 300D 12" subwoofer offers the power handling and adaptability you need to create the perfect car system.

Experience and expertise

When Hertz speakers made their debut in 1998, they quickly distinguished themselves with their award-winning performance and design innovations. They created the SPL Show Series for competitors who require high power handling under extreme conditions. The SX 300D 12" subwoofer offers the power handling and adaptability you need to create the perfect car system.

Made to be played loud

The 300D's cone is made of pressed paper, the same material as most musical instrument loudspeakers. The high-density foam surround and two-layer spider work with the cone to keep things on track, even at extreme volume levels. And this sub's internal works are designed to dissipate heat efficiently, so this sub can handle the high temperatures of extended play.

Installation options

With 600 watts of continuous power handling (2400 watts peak), the SX 300D gives you the kind of massive low end that everyone will notice. Its dual 2-ohm voice coils expand your options when designing your system. This sub is designed for use in sealed or ported enclosures so you can tailor the bass response to your tastes. 

To drive this single subwoofer, we recommend a mono amplifier rated between 450 and 900 watts RMS at 1 or 4 ohms. For more information, please refer to our article on How to Match Subwoofers and Amplifiers.

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Product highlights:

  • 12" subwoofer with dual 2-ohm voice coils
  • pressed paper cone with high-density foam surround
  • 4-layer aluminum voice coils
  • handles up to 600 watts continuous (2400 watts peak)
  • designed for SPL competition
  • frequency response: 34-800 Hz
  • sensitivity: 90.5 dB
  • top-mount depth: 6-7/8"
  • sealed box volume: 1 cu. ft
  • ported box volume: 1.2 cu. ft.
  • grille not included
  • warranty: 2 years
  • Our 60-day money-back guarantee
  • MFR # SX 300 D.1
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What's in the box:

  • One 12" Dual 2-ohm Subwoofer
  • 3 Voice coil jumpers (2 installed)
  • Top mount rubber gasket
  • Bottom mount rubber gasket
  • Plastic trim ring
  • Thermal Enhancer plate
  • Thermal Enhancer gasket
  • Ten 1-1/2" Screws
  • Six M5x10mm Machine screws (to mount Thermal Enhancer plate)
  • Five M3x6mm Machine screws (to mount trim ring)
  • 7 Screw cover clips
  • 2 Replacement terminal set screws
  • 2.5mm Allen wrench
  • Owner's manual (English/ Italian)
  • Recycling note
  • Hertz window sticker

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Features

Dual 2Ω Voice Coils: This woofer features two 2Ω voice coils to offer wiring flexibility. When the voice coils are wired in parallel, the woofer presents a 1Ω load. When the voice coils are wired in series, the woofer presents a 4Ω load. The included jumpers allow easy selection of 1Ω or 4Ω impedance while only using wire for a single speaker.

Terminals: The set screw terminals are all located on one side of the woofer. The terminals will accept bare wire up to 8 gauge.

Thermal Enhancer: Installing the included Thermal Enhancer plate (and gasket) reduces the operating temperature of the subwoofer's voice coils, increasing power handling and the acoustic pressure generated.

Note: Using the Thermal Enhancer increases the pressure inside the subwoofers air gap, causing an increase in mechanical noise. Because of this, it's typically only used in SPL competition.

Sealed Box: Hertz recommends a sealed enclosure volume of 28 liters (0.99 ft³). Sealed enclosures provide the most control over a woofer, will handle a lot of power, and provide accurate sonic reproduction, making them suitable for all types of music.

Ported Box: Hertz recommends a sealed enclosure volume of 34 liters (1.2 ft³) with one 80mm (3.15") diameter x 260mm (10.24") long port. Ported (or vented) enclosures typically provide better overall efficiency than sealed, maximizing bass output for a given amplifier.

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