The Hertz CX 100 delivers crisp, high‑sensitivity sound in a compact 4" dash package with an aim‑able tweeter for improved imaging; well made and affordable, though some vehicles may need minor modification to fit.
Buyer confidence
88%Highlights
- Soft Tetolon® fiber 24 mm (0.9 in.) dome tweeter cooled with ferrofluid, for extended and natural high frequencies.
- RHFC ™ (Rotary High Frequency Contour) tweeter angled and directable to the listener for a perfect frequency response in any installation scenario.
- Tweeter faceplate geometry optimized with FEM simulations (Finite Element Modeling), to provide an extremely linear frequency response in off-axis installations.
- 25 mm (1 in.) woofer voice coil featuring an aluminum former to guarantee high excursion and power handling.
Key specs
Full specs- Component
- Coaxials
- Size mm (in.)
- 100 (4)
- Power Handling - Continuous W
- 40
- Power Handling - Peak W
- 120
- Impedance Ohm
- 4
- Woofer Voice Coil Ø mm (in.)
- 25 (1)
- Tweeter Voice Coil Ø mm (in.)
- 13 (0.5)
- Frequency Response Hz
- 80 ÷ 22k
Key specs
Full specs- Component
- Coaxials
- Size mm (in.)
- 100 (4)
- Power Handling - Continuous W
- 40
- Power Handling - Peak W
- 120
Highlights
Overview- Soft Tetolon® fiber 24 mm (0.9 in.) dome tweeter cooled with ferrofluid, for extended and natural high frequencies.
- RHFC ™ (Rotary High Frequency Contour) tweeter angled and directable to the listener for a perfect frequency response in any installation scenario.
- Tweeter faceplate geometry optimized with FEM simulations (Finite Element Modeling), to provide an extremely linear frequency response in off-axis installations.
Review highlights
Based on customer reviewsHertz CX 100 — compact, clear-sounding dash speaker
The Hertz CX 100 delivers crisp, high‑sensitivity sound in a compact 4" dash package with an aim‑able tweeter for improved imaging; well made and affordable, though some vehicles may need minor modification to fit.
What buyers praise
- Crisp, clear sound with good sensitivity
- Aim-able tweeter suited to dash installs
What to watch for
- May require minor modification or adaptation to fit some older or uncommon dash openings
Overview
Key features
- Soft Tetolon® fiber 24 mm (0.9 in.) dome tweeter cooled with ferrofluid, for extended and natural high frequencies.
- RHFC ™ (Rotary High Frequency Contour) tweeter angled and directable to the listener for a perfect frequency response in any installation scenario.
- Tweeter faceplate geometry optimized with FEM simulations (Finite Element Modeling), to provide an extremely linear frequency response in off-axis installations.
- 25 mm (1 in.) woofer voice coil featuring an aluminum former to guarantee high excursion and power handling.
- 100 mm (5 in.) semi-pressed paper cone SPP-M (Semi Pressed Paper-Mica) enhanced with Mica powder for an excellent balance between lightness and damping.
- High-density flux ferrite magnet combined with low-carbon polar plates for reduced distortion at high power levels.
- Compact and transparent three-spoke basket acoustically combined with a rubber magnet cover for total damping of spurious vibrations.
- Elegant grille made with high-resistance ABS plastic structure with a metallic finish combined with a protective metal mesh, available as optional.
- SPP-M
- RHFC™
Technologies

SPP-M
SPP-M (Semi Pressed Paper-Mica) cone enhanced with Mica powder for an excellent balance between lightness and

RHFC™
RHFC™ (Rotary High Frequency Contour) tweeter angled and directable to the listener for a perfect frequency
Specs
Technical Specs
| Component | Coaxials |
| Size mm (in.) | 100 (4) |
| Power Handling - Continuous W | 40 |
| Power Handling - Peak W | 120 |
| Impedance Ohm | 4 |
| Woofer Voice Coil Ø mm (in.) | 25 (1) |
| Tweeter Voice Coil Ø mm (in.) | 13 (0.5) |
| Frequency Response Hz | 80 ÷ 22k |
| Woofer Magnet size D x d x h mm (in.) | 70 x 32 x 10 (2.76 x 1.26 x 0.39) |
| Tweeter Magnet size D x h mm (in.) | 13 x 2 (0.51 x 0.08) |
| Weight of one speaker kg (lb.) | 0,47 (1.04) |
| Woofer Magnet | High density flux ferrite |
| Tweeter Magnet | Neodymium |
| Cone | Semi-pressed paper + Mica |
| Dome | Tetolon |
| Xmech mm (in.) | 2,9 (0.11) |
Electro-acoustic Specs
| D mm | 86,5 |
| Re Ohm | 3,1 |
| Fs Hz | 100 |
| Le mH | 0,18 |
| Vas I | 2 |
| Mms g | 5,1 |
| Cms mm/N | 0,41 |
| BL T*m | 3,3 |
| Qts | 0,81 |
| Qes | 1,00 |
| Qms | 4,1 |
| Spl dB | 92 |
Physical Specs

| A | 102,5 mm | 4.04 in. |
| B | 93 mm | 3.66 in. |
| C | 57,5 mm | 2.26 in. |
| D | 43,5 mm | 1.71 in. |
Frequency response

Visual spec reference.
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