Hertz Mille Pro MPX 165.3

Hertz Mille Pro MPX 165.3 - 16.5 cm Coaxial Speakers for Precise In-Car Sound

The Hertz Mille Pro MPX 165.3 is a 6.5-inch coaxial speaker that provides clean, pinpoint sound dispersion, creating a stable soundstage in your car. The concentrically integrated tweeter is located in the voice coil of the woofer – ensuring that mids and highs emanate from a single acoustic center. A low resonant frequency, internal damping material, and an acoustic lens for optimizing dispersion support a controlled bass range and balanced highs. With 4 Ohm impedance and 100 W RMS, the MPX 165.3 is ideally suited for common car hi-fi amplifiers.

Technical Highlights

• Concentric coaxial tweeter: Integrated into the woofer's voice coil former – a shared point of emission for a homogeneous soundstage.
• Tweeter support as a back chamber: Designed for low Fs, ensures well-damped high-pass and allows for low crossover frequencies.
• 36 mm pure copper voice coil (woofer): Wound on polyamide former for high power handling and dynamic, compression-free reproduction.
• Pressed cellulose cone with cotton fibers: Stiff and light, with an optimized profile for a clean transition to the tweeter and consistent phase.
• "Boundary Free" rubber surround: Increases efficiency and extends the mid-bass range.
• Oversized ferrite magnet: In combination with low-carbon pole plates for low distortion at high power.
• Aluminum alloy basket: Shallow mounting depth, acoustically transparent, with diamond cut and Hertz logo.
• Anti-vibration rubber cover on the magnet: Reduces unwanted resonances.
• Acoustic lens and internal damping material: Optimize dispersion and smooth the frequency response.

Technical Data

• Size mm 165
• Power Handling - RMS W 100
• Power Handling - Peak W 200
• Impedance Ohm 4
• Woofer Voice Coil Ø mm 36
• Tweeter Voice Coil Ø mm 20
• Frequency Response Hz 45 - 21.5k
• Woofer Magnet Size W x D x H mm 90 x 45 x 17
• Tweeter Magnet Size W x H mm 29.5 x 22 x 4
• Weight of one speaker kg 1.27
• Woofer Magnet High-density flux ferrite
• Tweeter Neodymium magnet
• Cone Pressed cellulose cone with cotton fibers
• Xmech mm ±6

Physical Dimensions (A–F according to drawing)

• A 165 mm
• B 141 mm
• C 74 mm
• D 62.6 mm
• E 183.5 mm
• F 29 mm

Electro-Acoustic Parameters

• D mm 132
• Re Ohm 3.1
• Fs Hz 90
• Le mH 0.01
• Vas I 4
• Mms g 18.9
• Cms mm/N 0.15
• BL T*m 5.8
• Qts 0.88
• Qes 1.06
• Qms 5.5
• Spl dB 92

Frequency Response

Installation & Compatibility

The 16.5 cm coax fits into many OEM installation locations and is suitable as an upgrade for front or rear systems.

• Standard diameter 165 mm with shallow mounting depth (D 62.6 mm)
• 4 Ohm – suitable for most aftermarket amplifiers and powerful head units
• Recommended power class: up to 100 W RMS per channel
• Coaxial design saves space and simplifies installation

Features (Image Overview)