Hertz SPL Show ST 25A Neo 1.8 Inch Compression Driver Bullet Tweeter 100w Max

The Hertz SPL Show ST 25A Neo is a 1.8-inch compression driver bullet tweeter rated at 100W peak (4 ohm), from Hertz's SPL Show range. It uses a neodymium N38 H motor, a 25 mm CCAR voice coil and an aluminium diaphragm, with a waterproof, anti-UV treated body for in-car and outdoor use.

This is the Active version, supplied as the tweeter only for use with an external or DSP crossover. For the version with a metallic mesh grille and inline crossover filter, see the ST 25K Neo.

Key specifications

• Type: high-efficiency compression driver bullet tweeter
• Power handling: 100W peak (hi-pass filtered @ 5 kHz – 12 dB/octave)
• Impedance: 4 ohm
• Frequency response: 3 kHz – 20 kHz
• Voice coil: 25 mm CCAR (copper clad aluminium ribbon)
• Diaphragm: aluminium, neodymium N38 H magnet
• Body: waterproof and anti-UV treated
• Weight: 0.39 kg
• Version: Active — tweeter only, no crossover included

The NEO line bullet tweeters are a new design, lighter and more compact than the previous ST 25. Performance is improved through the use of a neodymium N38 H motor and a FEM (Finite Element Method) optimised driver and horn design.

Features

• Neodymium N38 H magnet delivers high output in a compact form factor.
• FEM-optimised phase-plug and loading horn for precise high-frequency dispersion.
• CCAR (copper clad aluminium ribbon) voice coil for high thermal and mechanical capability; compatible with replacement body kit.
• Extra-light aluminium membrane maximises SPL output; screw terminals for secure connection.
• Waterproof body with anti-UV treatment for safe outdoor use without discolouration over time.