Soft-dome tweeter 28SD1
Soft-dome tweeter 28SD1
Soft-dome tweeter 28SD1
Soft-dome tweeter 28SD1

Features

91 dB SPL
91 dB SPL

Efficiency

2 kHz - 22 kHz
2 kHz - 22 kHz

recommended frequency range

1.1" | 28mm
1.1" | 28mm

dimensions

Silk
Silk

Membrane material

±0.6 mm
±0.6 mm

linear motion

Features

91 dB SPL
91 dB SPL

Efficiency

2 kHz - 22 kHz
2 kHz - 22 kHz

recommended frequency range

1.1" | 28mm
1.1" | 28mm

dimensions

Silk
Silk

Membrane material

±0.6 mm
±0.6 mm

linear motion

Vendor:ETON Soundsysteme GmbH

Soft-dome tweeter 28SD1

Der ETON 28SD1 ist der Einstieg in die Welt der handgefertigten Lautsprecher-Manufaktur – ohne Kompromisse beim Klang. Die handbeschichtete 28-mm-Gewebekalotte aus ETON-eigener Fertigung sorgt für ein volles, warmes Klangbild mit authentischer Raumabbildung, das selbst erfahrene Audiophile überzeugt. Neutral, präzise, lebendig.

Mit einem Neodym-Antrieb (1,6 T) im Unterhang-System, einer außergewöhnlich geringen Schwingspuleninduktivität (Le = 0,02 mH) und 91 dB Wirkungsgrad ist der 28SD1 ein gutmütiger, berechenbarer Partner für passive Frequenzweichen – ideal für Ihr nächstes DIY-Lautsprecher-Projekt.

Warum der ETON 28SD1 für Ihr DIY-Projekt?

  • ✦ Handbeschichtete Gewebekalotte – ETON-Manufakturqualität, Made in Germany
  • ✦ 28 mm Schwingspule aus CCAW auf Aluminium-Träger – leicht, schnell, präzise
  • ✦ Neodym-Unterhang-Antrieb (1,6 T) – ohne Ferrofluid, langzeitstabil
  • ✦ 91 dB Wirkungsgrad – einfache Frequenzweichen-Auslegung ab ca. 2,5 kHz
  • ✦ 8 Ohm / 120 W (IEC 60268-5) – kompatibel mit allen gängigen DIY-Verstärker-Topologien
  • ✦ Kompaktes Format (104 mm Gesamtdurchmesser) – flexibel einsetzbar in Bücherregal- und Standlautsprechern

Ob klassischer Zwei-Wege-Lautsprecher, Bluetooth-Speaker-Projekt oder handgefertigtes High-End-Unikat – der ETON 28SD1 liefert die Hochtonpräzision, die Ihr Lautsprecher-Selbstbau verdient. 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.

Resonant frequency 580 Hz – the lowest resonance in the ETON Softdome product range: Crossover frequency from 2.5 kHz is possible, with more flexibility in system design than the 25SD4

Resonant frequency 580 Hz – the lowest resonance in the ETON Softdome product range: Crossover frequency from 2.5 kHz is possible, with more flexibility in system design than the 25SD4

90 mm Ø, 26.5 mm installation depth, 0.27 kg: Identical housing format to the Harddome 29HD2 – Softdome sound or Harddome precision in the same housing, no modifications required.

90 mm Ø, 26.5 mm installation depth, 0.27 kg: Identical housing format to the Harddome 29HD2 – Softdome sound or Harddome precision in the same housing, no modifications required.

Le = 0.02 mH / 1.6 T / 100 W: Extremely low voice coil inductance for the simplest crossover designs – stable and predictable across all standard amplifiers.

Le = 0.02 mH / 1.6 T / 100 W: Extremely low voice coil inductance for the simplest crossover designs – stable and predictable across all standard amplifiers.

In stock, ready to ship
140,00 EURUnit price(140,00 EUR each)

Pairs well with

Fast shipping

Try it risk-free for 30 days

2-year manufacturer's warranty

Made in Germany

Linear treble starting at 2.5 kHz

The frequency response of the 28SD1 bears the hallmark of an experienced loudspeaker manufacturer: In the core operating range of approximately 2 kHz to 15 kHz, the amplitude runs remarkably evenly – the foundation for the neutral, color-free high-frequency reproduction that ETON drivers are known for. With a 91 dB efficiency rating, the 28SD1 delivers confident dynamic reserves for level-stable DIY projects.

Particularly relevant for loudspeaker DIY builds: The smooth amplitude response at the lower end of the transmission range allows coupling starting at approximately 2.5 kHz – even with 2nd-order filters. This gives you plenty of flexibility when choosing the midrange driver and keeps the crossover manageable.

The uniform off-axis radiation pattern ensures consistent energy output in the room and a stable stage image even off the main listening axis. The complete absence of resonance-induced peaks in the upper transmission range is a direct result of the hand-coated fabric dome – applied individually to each driver in our factory, for a sound profile that sounds exactly as it measures.

Gentle load, simple switch design

The impedance curve of the 28SD1 shows the typical behavior of a carefully engineered soft-dome tweeter. The impedance peak occurs at the resonant frequency of approximately 510 Hz – well below standard practical crossover frequencies – creating a comfortable safety margin for crossover design.

Above resonance, the driver behaves almost purely resistively across a wide frequency range: The voice coil inductance is very low at Le = 0.02 mH, which minimizes the impedance rise at high frequencies. For the crossover designer, this means a forgiving, predictable load – simpler filter design, lower phase errors, and more flexibility in component selection.

The smooth, resonance-free frequency response curve with no dips or peaks in the operating range confirms the carefully optimized acoustic damping of the rear volume as well as tight manufacturing tolerances in the magnetic assembly. The result is a tweeter that performs in practice exactly as simulations promise – reliable, reproducible, and free of unexpected behavior.

Product Specification

Dimensions and installation
Total Diameter

104 mm

Volume Lid

71 mm

Total Depth

32.9 mm

Front Plate Thickness

4.9 mm

Weight

0,34 kg

Screw Hole Diameter (Screw / Head)

5 mm / 8 mm

Terminal (Negative / Positive)

4,8 mm / 4,8 mm

Voice coil
Diameter

28 mm

Height

2.3 mm

Wire material

CCAW

Carrier material

Aluminum

Winding layers

2

Magnetic drive
Magnetic flux density

1.6 T

Air gap height

3.5 mm

Material

Neodymium

Dimensions

60 mm x 35 mm

Drive system

Underhang

Ferrofluid

nein

Technical data
Nominal Impedance

Zn = 8 Ohm

DC Resistance

Re = 6.7 Ohm

Resonance Frequency (1 W)

fr = 510 Hz

TSP Resonance Frequency

fr = - Hz

Suspension Compliance

Cms = - mm/N

Mechanical Q Factor

Qms = -

Electrical Q Factor

Qes = -

Total Q Factor

Qts = -

Mechanical Resistance

Rms = - kg/s

Total Moving Mass (Including Air Load Mass)

Mmd = 0.32 g

Effective Radiating Area

Sd = 8.6 cm²

Voice Coil Inductance

Le = 0.02 mH

Force Factor

BLxl = 4.8 Tm

Electrical Xmax

+/- 0.6 mm

Mechanical Xmax

+/- 1.8 mm

Equivalent Volume

Vas = - dm³

Average Sound Pressure Level (1 W / 1 m)

91 dB SPL

Power Handling

120 W*


*IEC 60268-5

Downloads

Technical Datasheet Softdome HT 28SD1

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