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    New ES.5 Enclosure Designs

    In the “Tecnical” section, “Subwoofer construction”, you can download the “Enclosure Design” developed by Hertz R&D to achive the best performance from ES.5 Subs.

    The Hertz Energy.5 line offers the widest subwoofer range within the Hertz catalogue, boasting nine speaker models; three of them are Flat, and now five sub boxes add to them, for a really complete product offer, to satisfy any needs!

    Thanks to the advanced FEA – Finite Element Analysis- simulation design techniques and the constant support of the Klippel R&D system, the Energy.5 subwoofers provide extraordinary performance with extreme dynamics and SPL never achieved in this category of the market.
    In the Energy.5 subwoofers the most important improvement has been obtained by adopting the Hertz V-cone® technology which remarkably increased efficiency, in some models up to a +2dB compared to the previous series.
    Thanks to their new surround and spider geometry, as well as the selection of the materials used, the new ES subs provide unmatched mechanical, and thus also acoustical, linearity.

    ES F30.5, a 12” (300 mm), adding to the already appreciated ES F20.5 and ES F25.5, widens the Energy.5 Flat product offer.
    Solid, powerful bass, with a unique look: the Energy.5 subwoofers are the perfect choice for those who look for thrilling performance.

    All technical specifications of the new Energy.5 subwoofers are available in the “Products” section.

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    Die-cast aluminium factory provided grille featuring diamond-cut aluminium Hertz logo.

    Data table

    Size mm (in.) 180 (7)
    Power Handling - Peak W 400
    Power Handling - Continuous W 200
    Impedance 4
    Frequency response Hz 38 - 6k
    Sensitivity dB SPL 93
    Voice coil Ø mm (in.) 50 (2)
    Magnet Neodymium
    Cone/Dome Pressed-pulp cone with cotton fibres


    1. Neodymium magnet optimized with FEA simulations for real dynamics and utmost control.
    2. Very low carbon content CNC machined plates, for maximum magnetic permeability and low distortion at high power levels.
    3. Aluminium covered pole for a linear impedance modulation and low distortion.
    4. 50 mm CCAW double layer voice coil wound on a Polyamide former for exceptional power handling and compression-free re production even in the most demanding musical passages.
    5. Exponential V-cone® with optimized geometry for utmost linearity and dispersion.
    6. “Boundary Free” IIR rubber surround, for better efficiency and wider mid-bass frequency.
    7. Pressed-pulp cone with cotton fibres, combining stiffness and lightweight, to achieve wide frequency response and limited break-ups at high frequency.
    8. Three-spoke, very acoustically transparent anti-resonant aluminium alloy basket featuring built-in venting holes.
    9. CNC machined elegant diamond-cut basket edge featuring the Hertz logo.
    10. Die-cast aluminium factory provided grille featuring diamond-cut aluminium Hertz logo.

    Press review


    • V-CONE®

      he exponential profile gets very close to the perfect one, providing exceptional dispersion.
    • Boundary Free Surround

      This technology provides the ability to achieve wider emission surface of the cone compared to speakers with same diameter; that way, the cone manages to move a bigger mass of air, so it produces more acoustic pressure. This special surround is built from highly pure IIR butyl rubber, ensuring extraordinary thermal and mechanical linearity.

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