--> <div class="wpb-content-wrapper"><div class="vc_row wpb_row vc_row-fluid"><div class="wpb_column vc_column_container vc_col-sm-6"><div class="vc_column-inner"><div class="wpb_wrapper"> <div class="wpb_text_column wpb_content_element" > <div class="wpb_wrapper"> <h3 class="product_title entry-title"><span style="color: #ff6600;">Hertz</span> Energy ES F20.5 Ultra-Flat 8″ Subwoofer</h3> <div class="audi--product-description-paragraph"> <p>The <strong>Hertz Energy ES F20.5</strong> is an ultra-flat <strong>8” (200 mm)</strong> subwoofer built for maximum installation flexibility where depth is limited. With <strong>600W peak</strong> handling and a <strong>4Ω</strong> load, it delivers punchy, controlled bass while staying compact enough for hidden installs. Key design elements include a water-repellent pressed paper cone, a copper voice coil wound on an aluminium former for improved thermal capacity, and an air decompression system to maintain symmetry under high excursion.</p> </div> </div> </div> </div></div></div><div class="wpb_column vc_column_container vc_col-sm-6"><div class="vc_column-inner"><div class="wpb_wrapper"><div class="vc_empty_space" style="height: 32px"><span class="vc_empty_space_inner"></span></div> <div class="wpb_single_image wpb_content_element vc_align_center wpb_content_element"> <figure class="wpb_wrapper vc_figure"> <div class="vc_single_image-wrapper vc_box_border_grey"><img decoding="async" class="vc_single_image-img " src="https://www.audiofile-incar.co.uk/wp-content/uploads/2026/02/61AX-cbwWVL._AC_SL1500_.jpg" width="1421" height="940" alt="HERTZ ES F20.5 400 Watt Ultra Flat Subwoofer 200 mm 20 cm" title="HERTZ ES F20.5 400 Watt Ultra Flat Subwoofer 200 mm 20 cm" loading="lazy" /></div> </figure> </div> <div class="vc_empty_space" style="height: 32px"><span class="vc_empty_space_inner"></span></div></div></div></div></div><div class="vc_row wpb_row vc_row-fluid"><div class="wpb_column vc_column_container vc_col-sm-12"><div class="vc_column-inner"><div class="wpb_wrapper"><div class="vc_empty_space" style="height: 32px"><span class="vc_empty_space_inner"></span></div></div></div></div></div><div class="vc_row wpb_row vc_row-fluid"><div class="wpb_column vc_column_container vc_col-sm-12"><div class="vc_column-inner"><div class="wpb_wrapper"><div class="vc_tta-container" data-vc-action="collapseAll"><div class="vc_general vc_tta vc_tta-accordion vc_tta-color-orange vc_tta-style-classic vc_tta-shape-rounded vc_tta-spacing-1 vc_tta-controls-align-center vc_tta-o-all-clickable"><div class="vc_tta-panels-container"><div class="vc_tta-panels"><div class="vc_tta-panel" id="1731678339268-3908876b-3c97" data-vc-content=".vc_tta-panel-body"><div class="vc_tta-panel-heading"><h4 class="vc_tta-panel-title"><a href="#1731678339268-3908876b-3c97" data-vc-accordion data-vc-container=".vc_tta-container"><span class="vc_tta-title-text">Technical Specifications</span></a></h4></div><div class="vc_tta-panel-body"> <div class="wpb_text_column wpb_content_element" > <div class="wpb_wrapper"> <table> <thead> <tr> <th><strong>Feature</strong></th> <th><strong>Details</strong></th> </tr> </thead> <tbody> <tr> <td><strong>Component</strong></td> <td>Subwoofer</td> </tr> <tr> <td><strong>Size</strong></td> <td>200 mm (8″)</td> </tr> <tr> <td><strong>Power Handling</strong></td> <td>– Peak: 600 W<br /> – Continuous program: 200 W</td> </tr> <tr> <td><strong>Impedance</strong></td> <td>4 Ω</td> </tr> <tr> <td><strong>Frequency Response</strong></td> <td>32 – 400 Hz</td> </tr> <tr> <td><strong>Sensitivity</strong></td> <td>93 dB/SPL</td> </tr> <tr> <td><strong>Voice Coil</strong></td> <td>38 mm (1.5″)</td> </tr> <tr> <td><strong>Magnet</strong></td> <td>High density flux ferrite</td> </tr> <tr> <td><strong>Cone</strong></td> <td>Water repellent pressed paper</td> </tr> <tr> <td><strong>Weight (one component)</strong></td> <td>2.4 kg (5.28 lb)</td> </tr> <tr> <td><strong>X-max / X-mech</strong></td> <td>Xmax: 5 mm<br /> X-mech: 12 mm (0.47″)</td> </tr> <tr> <td><strong>Displacement</strong></td> <td>0.4 l (24.4 cu.in)</td> </tr> <tr> <td><strong>Magnet size (D × d × h)</strong></td> <td>120 × 60 × 22 mm (4.7 × 2.4 × 0.9 in)</td> </tr> <tr> <td><strong>Dimensions</strong></td> <td>Outer Ø (A): 209 mm (8.22″)<br /> Cutout Ø (B): 181 mm (7.12″)<br /> Total Depth (C): 85 mm (3.34″)<br /> Mounting Depth (D): 72 mm (2.83″)</td> </tr> <tr> <td><strong>SKU / Product Code</strong></td> <td>ES F20.5</td> </tr> </tbody> </table> </div> </div> </div></div><div class="vc_tta-panel" id="1731678339280-69f54a1e-1809" data-vc-content=".vc_tta-panel-body"><div class="vc_tta-panel-heading"><h4 class="vc_tta-panel-title"><a href="#1731678339280-69f54a1e-1809" data-vc-accordion data-vc-container=".vc_tta-container"><span class="vc_tta-title-text">Key Features</span></a></h4></div><div class="vc_tta-panel-body"> <div class="wpb_text_column wpb_content_element" > <div class="wpb_wrapper"> <ol> <li><strong>Ultra-Flat Install Flexibility</strong> <ul> <li><strong>Space-Saving Design:</strong> Ultra flat construction for maximum installation flexibility in shallow locations.</li> </ul> </li> <li><strong>Massive Motor Assembly</strong> <ul> <li><strong>Controlled Output:</strong> Designed for perfect control under high power, high excursion conditions.</li> </ul> </li> <li><strong>Water-Repellent Cone</strong> <ul> <li><strong>Durable Materials:</strong> Water-repellent pressed paper cone for reliable performance.</li> </ul> </li> <li><strong>High Thermal & Mechanical Capacity</strong> <ul> <li><strong>38mm Voice Coil:</strong> Copper voice coil wound on an aluminium former to improve thermal and mechanical capacity.</li> </ul> </li> <li><strong>Air Decompression System</strong> <ul> <li><strong>Stable at High Excursion:</strong> Ducts under the dust-cap enhance symmetry under high excursion and improve thermal dissipation.</li> </ul> </li> <li><strong>Mechanical Reliability</strong> <ul> <li><strong>Wide-Wave Spider:</strong> Resin-bonded fiber spider for consistent parameters and long-term reliability.</li> </ul> </li> <li><strong>High-Current Connectivity</strong> <ul> <li><strong>Robust Terminals:</strong> Tin-plated terminals and silver-plated lead wires for reliability and conductivity.</li> </ul> </li> <li><strong>Damped Basket & Motor Coupling</strong> <ul> <li><strong>Reduced Resonance:</strong> Basket and motor coupled and damped with special epoxy glue.</li> </ul> </li> <li><strong>Consistent Magnetic Flux</strong> <ul> <li><strong>Stable Performance:</strong> High thermal dissipation and magnetic permeability plates provide constant, even flux.</li> </ul> </li> </ol> </div> </div> </div></div><div class="vc_tta-panel" id="1731678446080-6fc22c80-5ea1" data-vc-content=".vc_tta-panel-body"><div class="vc_tta-panel-heading"><h4 class="vc_tta-panel-title"><a href="#1731678446080-6fc22c80-5ea1" data-vc-accordion data-vc-container=".vc_tta-container"><span class="vc_tta-title-text">Applications</span></a></h4></div><div class="vc_tta-panel-body"> <div class="wpb_text_column wpb_content_element" > <div class="wpb_wrapper"> <p> The <strong>Hertz Energy ES F20.5</strong> is ideal for:</p> <ul> <li><strong>Shallow-Mount Builds:</strong> Perfect where enclosure depth is limited (under-seat, side panels, compact stealth enclosures).</li> <li><strong>OEM Audio Upgrades:</strong> Adds real low-end to factory systems while keeping installation discreet.</li> <li><strong>Space-Efficient Bass Systems:</strong> Great for daily-driven vehicles where boot space matters.</li> </ul> </div> </div> </div></div><div class="vc_tta-panel" id="1732808856144-5dc65484-3420" data-vc-content=".vc_tta-panel-body"><div class="vc_tta-panel-heading"><h4 class="vc_tta-panel-title"><a href="#1732808856144-5dc65484-3420" data-vc-accordion data-vc-container=".vc_tta-container"><span class="vc_tta-title-text">Installation Tips</span></a></h4></div><div class="vc_tta-panel-body"> <div class="wpb_text_column wpb_content_element" > <div class="wpb_wrapper"> <ul> <li><strong>Check Cutout & Depth:</strong> Ensure your mounting location matches the cutout diameter (<strong>181 mm</strong>) and mounting depth (<strong>72 mm</strong>).</li> <li><strong>Seal the Mounting Surface:</strong> Use a gasket/seal to prevent air leaks that reduce bass performance.</li> <li><strong>Amplifier Matching:</strong> Pair with a suitable amplifier for a <strong>4Ω</strong> sub and set gain properly to avoid distortion.</li> <li><strong>Low-Pass Crossover:</strong> Start with a low-pass around <strong>70–90 Hz</strong> and adjust to blend with your front speakers.</li> </ul> </div> </div> </div></div><div class="vc_tta-panel" id="1732808855158-f936e27f-20e6" data-vc-content=".vc_tta-panel-body"><div class="vc_tta-panel-heading"><h4 class="vc_tta-panel-title"><a href="#1732808855158-f936e27f-20e6" data-vc-accordion data-vc-container=".vc_tta-container"><span class="vc_tta-title-text">Conclusion</span></a></h4></div><div class="vc_tta-panel-body"> <div class="wpb_text_column wpb_content_element" > <div class="wpb_wrapper"> <p> The <strong>Hertz Energy ES F20.5</strong> is a smart choice when you want strong, controlled bass but don’t have the depth for a traditional subwoofer. Its ultra-flat profile, robust motor control, and reliability-focused construction make it ideal for compact, stealth, and OEM-style builds—without compromising on real low-end output.</p> <h6><i>Note: Please ensure correct fitment (cutout and depth) before purchase. If you have any questions about installation or enclosure options, feel free to ask.</i></h6> </div> </div> </div></div></div></div></div></div></div></div></div></div><div class="vc_row wpb_row vc_row-fluid"><div class="wpb_column vc_column_container vc_col-sm-12"><div class="vc_column-inner"><div class="wpb_wrapper"><div class="vc_empty_space" style="height: 32px"><span class="vc_empty_space_inner"></span></div></div></div></div></div> </div><!-- Hertz Energy ES F20.5 Ultra-Flat 8″ Subwoofer The Hertz Energy ES F20.5 is an ultra-flat 8” (200 mm) subwoofer built for maximum installation flexibility where depth is limited. With 600W peak handling and a 4Ω load, it delivers punchy, controlled bass while staying compact enough for hidden installs. Key design elements include a water-repellent pressed paper cone, a copper voice coil wound on an aluminium former for improved thermal capacity, and an air decompression system to maintain symmetry under high excursion. Technical Specifications Feature Details Component Subwoofer Size 200 mm (8″) Power Handling – Peak: 600 W – Continuous program: 200 W Impedance 4 Ω Frequency Response 32 – 400 Hz Sensitivity 93 dB/SPL Voice Coil 38 mm (1.5″) Magnet High density flux ferrite Cone Water repellent pressed paper Weight (one component) 2.4 kg (5.28 lb) X-max / X-mech Xmax: 5 mm X-mech: 12 mm (0.47″) Displacement 0.4 l (24.4 cu.in) Magnet size (D × d × h) 120 × 60 × 22 mm (4.7 × 2.4 × 0.9 in) Dimensions Outer Ø (A): 209 mm (8.22″) Cutout Ø (B): 181 mm (7.12″) Total Depth (C): 85 mm (3.34″) Mounting Depth (D): 72 mm (2.83″) SKU / Product Code ES F20.5 Key Features Ultra-Flat Install Flexibility Space-Saving Design: Ultra flat construction for maximum installation flexibility in shallow locations. Massive Motor Assembly Controlled Output: Designed for perfect control under high power, high excursion conditions. Water-Repellent Cone Durable Materials: Water-repellent pressed paper cone for reliable performance. High Thermal & Mechanical Capacity 38mm Voice Coil: Copper voice coil wound on an aluminium former to improve thermal and mechanical capacity. Air Decompression System Stable at High Excursion: Ducts under the dust-cap enhance symmetry under high excursion and improve thermal dissipation. Mechanical Reliability Wide-Wave Spider: Resin-bonded fiber spider for consistent parameters and long-term reliability. High-Current Connectivity Robust Terminals: Tin-plated terminals and silver-plated lead wires for reliability and conductivity. Damped Basket & Motor Coupling Reduced Resonance: Basket and motor coupled and damped with special epoxy glue. Consistent Magnetic Flux Stable Performance: High thermal dissipation and magnetic permeability plates provide constant, even flux. Applications The Hertz Energy ES F20.5 is ideal for: Shallow-Mount Builds: Perfect where enclosure depth is limited (under-seat, side panels, compact stealth enclosures). OEM Audio Upgrades: Adds real low-end to factory systems while keeping installation discreet. Space-Efficient Bass Systems: Great for daily-driven vehicles where boot space matters. Installation Tips Check Cutout & Depth: Ensure your mounting location matches the cutout diameter (181 mm) and mounting depth (72 mm). Seal the Mounting Surface: Use a gasket/seal to prevent air leaks that reduce bass performance. Amplifier Matching: Pair with a suitable amplifier for a 4Ω sub and set gain properly to avoid distortion. Low-Pass Crossover: Start with a low-pass around 70–90 Hz and adjust to blend with your front speakers. Conclusion The Hertz Energy ES F20.5 is a smart choice when you want strong, controlled bass but don’t have the depth for a traditional subwoofer. Its ultra-flat profile, robust motor control, and reliability-focused construction make it ideal for compact, stealth, and OEM-style builds—without compromising on real low-end output. Note: Please ensure correct fitment (cutout and depth) before purchase. If you have any questions about installation or enclosure options, feel free to ask.
