Hertz SPL Show ST 25K Neo.2 - Compact 4-Ohm Horn Tweeter for High Sound Levels
The Hertz SPL Show ST 25K Neo.2 is a horn tweeter for your SPL or show-sound setup that delivers powerful high-frequency levels in a very compact design. The N38H neodymium motor, an FEM-optimized phase plug, and the loaded horn work efficiently together to cover the range from 3 kHz to 20 kHz. In the kit version, you also get a metal grille and an inline crossover filter. Thanks to its water and UV-resistant design, the tweeter is also suitable for exposed installation locations.
Technical Highlights
- Neodymium motor (N38H) for high performance in a small size
- FEM-optimized phase plug and loaded horn for controlled dispersion
- CCAR (Copper Clad Aluminium Ribbon) voice coil – thermally and mechanically resilient, recone kit compatible
- Lightweight aluminum diaphragm for high sound pressure
- Waterproof and UV-resistant – impervious to weather and discoloration
- Kit version includes metal grille and inline crossover filter
Technical Data
- Impedance: 4 Ohm
- Power Handling (Peak): 100 W (with high-pass at 5 kHz, 12 dB/Oct.)
- Frequency Response: 3 kHz – 20 kHz
- Voice Coil: Ø 25 mm (1")
- Magnet: Neodymium (N38H)
- Diaphragm/Dome: Aluminum
- Size: 44 mm
- Weight: 0.39 kg
Electro-acoustic Data
- Effective Diameter (D): 35.5 mm
- DC Resistance (Re): 2.9 Ohm
- Resonance Frequency (Fs): 3900 Hz
- Voice Coil Inductance (Le): 0.03 mH
- Force Factor (Bl): 2.05 T·m
- Sound Pressure Level: 107 dB
Dimensions
- A: 57 mm
- B: 43.5 mm
- C: 55.5 mm
- D: 29.7 mm
Installation & Compatibility
The ST 25K Neo.2 is ideal for SPL front systems, motorcycles, or boats if you are looking for a robust and high-output tweeter. For reliable operation, use a high-pass filter at 5 kHz with 12 dB/Oct. The 4-ohm design makes integration into common car hi-fi amplifiers straightforward. Thanks to its compact dimensions, the tweeter can be easily integrated into A-pillars, mirror triangles, or door panels. The weather-resistant and UV-stable design also supports use in exposed installation locations.
