The Hertz ES F20.5 from the Energy 5 range is an ultra-flat 8" (200mm) subwoofer designed for tight spaces without sacrificing output. With 600W peak power handling, high sensitivity, and a slim installation profile, it’s ideal for stealth installs in modern vehicles where depth is limited but real bass performance is still the goal.

Built around an ultra-flat design for maximum install flexibility, the ES F20.5 pairs a massive motor assembly with a water-repellent pressed paper cone to stay controlled under high power and high excursion conditions. A copper voice coil wound on an aluminium former improves thermal handling, while Hertz’s air decompression ducting under the dust-cap helps maintain symmetry at high excursion and improves heat dissipation.

Reliability is enhanced with a resin-bonded fibre spider, high-current tin-plated terminals, silver-plated lead wires, and a basket/motor assembly damped with special epoxy glue. The result is a compact subwoofer engineered for clean, punchy low-end from a shallow-mount footprint.

Technical Specifications:

• Component: Subwoofer
• Size: 200mm (8")
• Power Handling: 600W peak / 200W continuous program
• Impedance: 4Ω
• Frequency Response: 32Hz – 400Hz
• Sensitivity: 93 dB (SPL)
• Voice Coil: 38mm (1.5")
• Cone: Water repellent pressed paper
• Magnet: High density flux ferrite
• Weight (one component): 2.4kg (5.28lb)

Dimensions (approx.):

• Outer Diameter (A): 209mm (8.22")
• Cutout Diameter (B): 181mm (7.12")
• Total Depth (C): 85mm (3.34")
• Mounting Depth (D): 72mm (2.83")

Electro-Acoustic Parameters:

• D (effective): 166mm
• Xmax: 5mm
• Re: 2.9Ω
• Fs: 52Hz
• Le: 1.05mH
• Vas: 13.2L
• Mms: 49g
• Cms: 0.19mm/N
• BL: 10.6 T·m
• Qts: 0.40
• Qes: 0.46
• Qms: 3.38
• SPL: 93dB
• X-mech: 12mm (0.47")

• SKU / Product Code: HZ-ESF20.5

What’s in the Box:

• Hertz Energy 5 ES F20.5 ultra-flat 8" subwoofer
• Manufacturer documentation (as supplied)

Key Features:

• Ultra-flat design for maximum installation flexibility
• Massive motor assembly for control under high power/high excursion
• Water-repellent pressed paper cone
• Copper voice coil wound on aluminium former for improved thermal capacity
• Air decompression ducting under dust-cap for symmetry and heat dissipation
• Wide-wave resin-bonded fibre spider for long-term mechanical reliability
• High-current tin-plated terminals
• Silver-plated lead wires for conductivity and durability
• Basket and motor damped with special epoxy glue
• High thermal dissipation / magnetic permeability plates for consistent flux

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