Hertz Cento CS 300 S4 Sub 12 Inch 30cm 300mm Car Subwoofer 4ohm 350w RMS

The Hertz Cento CS 300 S4 is a 12 inch (300 mm) car subwoofer with a single 4 ohm voice coil, rated at 350W RMS and 700W peak, from Hertz's Cento range.

This listing is the 4 ohm (S4) version. The Hertz Cento CS 300 is also available in 2 ohm (S2). The optional CG 300 metal mesh grille is sold separately.

Key specifications

• Size: 300 mm (12 in.)
• Power handling: 350W RMS, 700W peak
• Impedance: 4 ohm single voice coil
• Voice coil: 35 mm (1.38 in.), six-layer copper on glass fibre former
• Xmech: 16.5 mm (0.65 in.)
• Magnet: high density flux ferrite
• Cone: polypropylene
• Weight: 4.84 kg (10.68 lb)
• Recommended enclosure: sealed, from 32 litres

Hertz Cento CS 300 S4

300 (12) mm (in.) | Subwoofer | 700W peak | 4 Ohm

The authentic Hertz Sound Experience for the young enthusiasts

The CS 300 S4 is designed to deliver strong bass from compact sealed enclosures. Hertz's engineering team optimised the electroacoustic parameters to achieve high performance in enclosures from just 32 litres for the 30 cm (12 in.) driver.

The 4 ohm single voice coil configuration offers wide compatibility with most amplifiers and suits enclosures housing more than one subwoofer.

The compact magnetic group, reduced depth, and absence of a rear decompression hole allow the enclosure to be built tightly around the driver — useful in tight or custom installations.

A six-layer voice coil cooling system keeps operating temperature within an optimal range during extended high-volume listening sessions.

• Electroacoustic design optimised for enclosures from 32 litres.
• Fluid dynamic optimisation system that drastically reduces acoustic distortion caused by air compression at high excursions.
• Polypropylene cone and dust cap geometry engineered through FEM simulations for low-frequency distortion reduction.
• 35 mm 4 ohm voice coil wound on six layers of pure copper on a high thermal resistance glass fibre support.
• Magnetic group geometry optimised with proprietary software for high undistorted SPL at high excursions.
• Compact size and no decompression hole make it ideal for custom enclosures shaped closely around the driver.
• Terminal block with solid push contacts accepting cables up to 8 AWG — low wiring resistance and easy connection in multi-subwoofer installations.
• Rubber-protected magnetic assembly and high-strength ABS plastic gasket for fitting the optional CG 300 grille.

An innovative fluid dynamic optimisation system — using the spider support as an air duct towards venting holes in the basket — reduces acoustic distortion from air compression at high excursions.

The cone geometry, suspension, and spider were developed using FEM (Finite Element Method) simulations to maintain control and low distortion at high mechanical excursions.

The terminal block uses solid push connectors accepting cables up to 8 AWG for low wiring resistance and straightforward connection, even in multi-subwoofer setups.

An ABS plastic gasket is included to mount the optional CG 300 grille — a robust black metal mesh cover with a Hertz diamond aluminium logo — for a clean finished look.