Soft Dome Tweeter 25SD4
Soft Dome Tweeter 25SD4
Soft Dome Tweeter 25SD4
Soft Dome Tweeter 25SD4

Features

92 dB SPL
92 dB SPL

Efficiency

2 kHz - 22 kHz
2 kHz - 22 kHz

recommended frequency range

1" | 25mm
1" | 25mm

dimensions

Silk
Silk

Membrane material

±0.4 mm
±0.4 mm

linear motion

Features

92 dB SPL
92 dB SPL

Efficiency

2 kHz - 22 kHz
2 kHz - 22 kHz

recommended frequency range

1" | 25mm
1" | 25mm

dimensions

Silk
Silk

Membrane material

±0.4 mm
±0.4 mm

linear motion

Vendor:ETON Soundsysteme GmbH

Soft Dome Tweeter 25SD4

Der ETON 25SD4 ist der kompakteste Softdome-Hochtöner aus der ETON-Manufaktur – und gleichzeitig der mit dem höchsten Wirkungsgrad. Die handbeschichtete 25-mm-Gewebekalotte liefert ein volles, warmes Klangbild mit authentischer Raumabbildung, das typisch für ETON-Treiber ist: neutral, präzise, ohne Ermüdungserscheinungen auch bei langen Hörsitzungen.

Mit einer magnetischen Flussdichte von 1,8 T – dem höchsten Wert im ETON Softdome-Sortiment – und einem Wirkungsgrad von 92 dB ist der 25SD4 ein hocheffizienter Treiber, der auch in wirkungsgradstarken DIY-Konstruktionen souverän mitspielt. Das Neodym-Unterhang-System arbeitet ohne Ferrofluid – für maximale Langzeitstabilität.

Warum der ETON 25SD4 für Ihr DIY-Projekt?

  • ✦ Handbeschichtete 25-mm-Gewebekalotte – ETON-Manufakturqualität, Made in Germany
  • ✦ 1,8 T Flussdichte – höchster Wert im ETON Softdome-Sortiment, maximaler Antrieb
  • ✦ 92 dB Wirkungsgrad – ideal für wirkungsgradstarke Konstruktionen und Breitbänder-Kombinationen
  • ✦ Kompaktestes Format (90 mm Ø, 26,5 mm Einbautiefe, 0,26 kg) – für enge Einbausituationen und kleine Gehäuse
  • ✦ 8 Ohm / 100 W (IEC 60268-5) – zuverlässig und berechenbar für passive Frequenzweichen
  • ✦ Le = 0,02 mH – nahezu rein resistive Last, einfache Filterauslegung

Ob kompakter Zwei-Wege-Monitor, Wandlautsprecher oder platzsparendes Bluetooth-Speaker-Projekt – der ETON 25SD4 bringt ETON-Manufakturqualität in das kleinste Gehäuse. Kombinieren Sie ihn mit passenden ETON-Mittel- und Tieftönern für ein vollständiges, audiophiles DIY-System.

Softdome-Kalotte: Warm, supple sound signature with natural sound staging and excellent 3D stage imaging – for long listening sessions without fatigue.

Softdome-Kalotte: Warm, supple sound signature with natural sound staging and excellent 3D stage imaging – for long listening sessions without fatigue.

92 dB efficiency / 1.8 T: Highest efficiency in the ETON Soft Dome range – ideal for high-efficiency systems and high-headroom high-end constructions.

92 dB efficiency / 1.8 T: Highest efficiency in the ETON Soft Dome range – ideal for high-efficiency systems and high-headroom high-end constructions.

90 mm Ø, 26.5 mm installation depth, 0.27 kg: Most compact format in the ETON Softdome product range – identical housing format as the Harddome 26HD3 for maximum project flexibility.

90 mm Ø, 26.5 mm installation depth, 0.27 kg: Most compact format in the ETON Softdome product range – identical housing format as the Harddome 26HD3 for maximum project flexibility.

Le = 0.02 mH / fs 670 Hz: Extremely low voice coil inductance for the simplest crossover designs – A crossover frequency of 2.5 kHz and above is recommended.

Le = 0.02 mH / fs 670 Hz: Extremely low voice coil inductance for the simplest crossover designs – A crossover frequency of 2.5 kHz and above is recommended.

In stock, ready to ship
99,00 EUR

Pairs well with

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Try it risk-free for 30 days

2-year manufacturer's warranty

Made in Germany

Efficiency Meets Linearity

The frequency response of the 25SD4 illustrates exactly what the high magnetic flux density of 1.8 T translates to in real-world use: an efficient, high-power driver with 92 dB efficiency that delivers a smooth, linear amplitude curve across its core operating range starting at 3 kHz. This forms the foundation for a neutral, coloration-free sound signature – without the artificial brightness boost that some hard dome drivers market as 'enhanced detail richness'.

The 25SD4 is an especially logical choice for high-efficiency DIY audio builds: at 92 dB, it integrates seamlessly with higher-efficiency midrange and bass drivers without requiring any level matching in the crossover. This simplifies crossover design and keeps signal losses to a minimum.

Off-axis radiation performance is appropriately wide for a 25 mm driver – a physical advantage of the smaller dome compared to larger designs. The result is uniform energy dispersion throughout the listening space and stable stage imaging even off the main listening axis. As with all ETON soft dome drivers, the complete absence of resonance-induced peaks is a direct result of the hand-coated fabric domes produced in our in-house factory.

Calculable from 670 Hz to well above that

The impedance curve of the 25SD4 shows the behavior of a compact, highly efficient soft-dome tweeter. The impedance peak occurs at the resonant frequency of approximately 670 Hz. This yields a clear recommendation for crossover design: Above 3 kHz, coupling with a 2nd-order filter is uncritical and the simplest, most reliable solution for most DIY projects — the safety margin from resonance is comfortable, and filter design remains straightforward.

For experienced builders, a crossover frequency starting around 2 kHz is also feasible — but this requires a steeper 3rd- or 4th-order filter to ensure the necessary spacing from the resonant frequency. This opens up combination options with midrange drivers that cap their operating range at 2 kHz, and gives the overall system greater flexibility.

Above the resonant frequency, the driver behaves almost purely resistively thanks to its extremely low voice coil inductance (Le = 0.02 mH) — the impedance rise at high frequencies is minimal. The result is a well-behaved, predictable load for the crossover and amplifier that performs exactly as it does in simulations in real-world use.

Product Specification

Dimensions and installation
Total diameter

90 mm

Volume cover

62.3 mm

Total depth

26.5 mm

Front plate thickness

5.6 mm

Weight

0,26 kg

Screw hole diameter (screw / head)

5 mm / 8 mm

Terminal (Negative / Positive)

4,8 mm / 4,8 mm

Voice coil
Diameter

25 mm

Height

1.2 mm

Wire material

CCAW

Carrier material

Aluminum

Winding layers

2

Magnetic drive
Magnetic flux density

1.8 T

Air gap height

2 mm

Material

Neodymium

Dimensions

55 mm x 32 mm

Drive system

Underhang

Ferrofluid

nein

Technical data
Nominal impedance

Zn = 8 Ohm

DC resistance

Re = 6.8 Ohm

1 W resonance frequency

fr = 670 Hz

TSP resonance frequency

fr = - Hz

Suspension compliance

Cms = - mm/N

Mechanical quality factor

Qms = -

Electrical quality factor

Qes = -

Total quality factor

Qts = -

Mechanical resistance

Rms = - kg/s

Total moving mass (including moving air mass)

Mmd = 0.22 g

Effective radiation area

Sd = 6.8 cm²

Voice coil inductance

Le = 0.02 mH

Force factor

BLxl = 3.7 Tm

Electrical Xmax

+/- 0.4 mm

Mechanical Xmax

+/- 1.2 mm

Equivalent volume

Vas = - dm³

Average sound pressure level 1 W / 1 m

92 dB SPL

Power handling

100 W*


*IEC 60268-5

Downloads

Technical Datasheet Softdome HT 25SD4

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