Symphony II 4-312/C8/25 HEX
Symphony II 4-312/C8/25 HEX
Symphony II 4-312/C8/25 HEX
Symphony II 4-312/C8/25 HEX

Features

88 dB SPL
88 dB SPL

Efficiency

100 Hz - 5.4 kHz
100 Hz - 5.4 kHz

Recommended frequency range

4" | ±100mm
4" | ±100mm

dimensions

Fiber optic
Fiber optic

Membrane material

Phase Plug
Phase Plug

Optimized Treble

±2 mm
±2 mm

linear motion

Features

88 dB SPL
88 dB SPL

Efficiency

100 Hz - 5.4 kHz
100 Hz - 5.4 kHz

Recommended frequency range

4" | ±100mm
4" | ±100mm

dimensions

Fiber optic
Fiber optic

Membrane material

Phase Plug
Phase Plug

Optimized Treble

±2 mm
±2 mm

linear motion

Vendor:ETON Soundsysteme GmbH

Symphony II 4-312/C8/25 HEX

Der ETON Symphony II 4-312 ist ein 4"-Tiefmittelton-Treiber der Spitzenklasse für audiophile DIY-Lautsprecher-Projekte und Lautsprechermanufakturen, bei denen Hexacone-Membrantechnologie, ein Phase Plug für kontrolliertes Abstrahlverhalten und höhere Trennfrequenzen gefragt sind. Das Herzstück des Symphony II 4-312 ist die Kombination aus der patentierten Hexacone-Membran im Mehrschichtaufbau und dem Phase Plug in offener Bauweise: Der Phase Plug optimiert das Abstrahlverhalten im oberen Mitteltonbereich, reduziert thermische Kompression und ermöglicht Trennfrequenzen bis ca. 3–4 kHz – für eine präzise, phasenoptimierte Integration mit dem Hochtöner in 2-Wege- und 3-Wege-Systemen. Die Hexacone-Membran bleibt dabei auch bei hohen Auslenkungen formstabil – linear, kontrolliert, ohne Partialschwingungen bei hohen Pegeln.

Mit einer Resonanzfrequenz von 71 Hz (TSP), einem Qts von 0,39 und einem Äquivalentvolumen von 3,7 dm³ ist der Symphony II 4-312 flexibel für Bassreflex- und geschlossene Gehäuse ab ca. 3–8 Litern ausgelegt. Der Kraftfaktor BL = 5,8 Tm bei einer bewegten Masse von nur 5,8 g sorgt für eine agile, impulstreue Wiedergabe mit präziser Transientendarstellung. Mit 88 dB Wirkungsgrad, 50 W Belastbarkeit (IEC 60268-5), 122 mm Gesamtdurchmesser und 1,24 kg ist der Symphony II 4-312 der Tiefmittelton-Treiber im Symphony II Sortiment für Projekte, bei denen das kontrollierte Abstrahlverhalten des Phase Plugs eine sauberere Hochtöner-Integration ermöglicht. Made in Germany, aus der ETON-Manufaktur.

Warum der ETON Symphony II 4-312 für Ihr Projekt?

  • Patentierte Hexacone-Membran im Mehrschichtaufbau + Phase Plug: Raumfahrttechnologie trifft kontrolliertes Abstrahlverhalten – formstabil, präzise, mit breitem Sweet Spot
  • Phase Plug: Trennfrequenz bis ca. 3–4 kHz: kontrolliertes Abstrahlverhalten im oberen Mitteltonbereich für eine saubere, phasenoptimierte Hochtöner-Integration
  • BL = 5,8 Tm / Mmd = 5,8 g / fs 71 Hz (TSP): agiler Antrieb für impulstreue, präzise Wiedergabe von 71 Hz bis ca. 3–4 kHz
  • Qts 0,39 / Vas 3,7 dm³: flexibel für Bassreflex und geschlossene Gehäuse ab ca. 3–8 Litern – vielseitige Gehäuseauslegung für kompakte Konstruktionen
  • 88 dB / 50 W (IEC 60268-5) / Xmax ±2,0 mm elektrisch / ±5,5 mm mechanisch: hoher Wirkungsgrad und Sicherheitspuffer für pegelfeste Wiedergabe
  • 122 mm Ø, 66 mm Tiefe, 1,24 kg: kompaktes 4"-Format für enge Einbausituationen und kleine Gehäuse. Made in Germany.

Für DIY-Lautsprecher-Projekte und Lautsprechermanufakturen, bei denen Hexacone-Membrantechnologie, ein Phase Plug für kontrolliertes Abstrahlverhalten und ein agiler Antrieb im kompakten 4"-Format gefragt sind – der ETON Symphony II 4-312. Made in Germany, aus der ETON-Manufaktur.

Patented Hexacone diaphragm in a multilayer construction + phase plug in an open design: aerospace technology meets controlled dispersion behavior – linear at 50 W, low beaming up to 3–4 kHz, without partial vibrations.

Patented Hexacone diaphragm in a multilayer construction + phase plug in an open design: aerospace technology meets controlled dispersion behavior – linear at 50 W, low beaming up to 3–4 kHz, without partial vibrations.

Phase plug: uniform dispersion behavior, reduced thermal compression during prolonged operation, and phase-optimized tweeter integration at 2–4 kHz – for a wide sweet spot and spatially open sound imaging.

Phase plug: uniform dispersion behavior, reduced thermal compression during prolonged operation, and phase-optimized tweeter integration at 2–4 kHz – for a wide sweet spot and spatially open sound imaging.

BL = 5.8 Tm / Mmd = 5.8 g / fs 71 Hz (TSP) / Qts 0.39: agile drive for transient-accurate reproduction from 71 Hz to 4 kHz – flexible for bass reflex and sealed enclosures from approx. 3–8 liters.

BL = 5.8 Tm / Mmd = 5.8 g / fs 71 Hz (TSP) / Qts 0.39: agile drive for transient-accurate reproduction from 71 Hz to 4 kHz – flexible for bass reflex and sealed enclosures from approx. 3–8 liters.

88 dB / 50 W (IEC 60268-5) / 122 mm Ø / 1.24 kg – high efficiency, compact 4" format, ferrite 1.15 T, Le = 0.38 mH. Made in Germany, from the ETON manufactory.

88 dB / 50 W (IEC 60268-5) / 122 mm Ø / 1.24 kg – high efficiency, compact 4" format, ferrite 1.15 T, Le = 0.38 mH. Made in Germany, from the ETON manufactory.

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2-year manufacturer's warranty

Made in Germany

88 dB / Hexacone diaphragm + phase plug / fs 71 Hz – usable from 71 Hz to 3–4 kHz, 50 W

The frequency response of the Symphony II 4-312 shows the behavior of a top-class 4" midwoofer driver with patented Hexacone diaphragm in multilayer construction and phase plug: a uniform, controlled amplitude response from approx. 71 Hz to 3–4 kHz – with 88 dB efficiency and a stable level structure across the entire transmission range. The Hexacone diaphragm ensures a linear frequency response: the honeycomb structure adopted from aerospace technology in multilayer construction remains electrically dimensionally stable even at high excursions up to Xmax ±2.0 mm – without partial oscillations and peaks in the upper transmission range. The result is a frequency response that is just as linear at 50 W as it is at 1 W.

The open-design phase plug is the decisive factor for the controlled frequency response in the upper transmission range: it ensures uniform sound radiation across the entire diaphragm surface and low-directivity radiation behavior up to approx. 3–4 kHz. The result is a frequency response without the peaks and dips that can occur in the upper midrange with drivers without a phase plug. For the DIY developer and the loudspeaker manufacturer, this means: the crossover frequency to the tweeter can be selected at approx. 2–4 kHz – in an acoustically uncritical range in which both drivers operate optimally and enable phase-optimized, seamless integration.

The uniform frequency response without dips or peaks in the transmission range demonstrates the superior quality of the Hexacone diaphragm and the drive system (BL = 5.8 Tm, ferrite 1.15 T, Le = 0.38 mH). A 4" midwoofer driver with Hexacone diaphragm and phase plug that sounds the way it measures – precise, linear, with real aerospace technology inside. Made in Germany, from the ETON manufactory.

Qts 0.39 / fs 71 Hz / BL 5.8 Tm – Hexacone membrane + phase plug, 50 W, BR & sealed

The impedance curve of the Symphony II 4-312 shows the behavior of a top-class 4" midwoofer driver with patented multi-layer Hexacone membrane and phase plug: The impedance maximum is at approx. 71 Hz (TSP) – the tuning basis for use as a midwoofer driver in compact 2-way and 3-way systems. The Qts value of 0.39 and the equivalent volume of 3.7 dm³ allow flexible enclosure design – for both bass reflex enclosures and sealed enclosures from approx. 3–8 liters. The force factor BL = 5.8 Tm with a moving mass of only 5.8 g ensures a precise, agile drive with lightning-fast impulse response across the entire frequency range up to approx. 3–4 kHz.

The open-design phase plug actively optimizes the dispersion behavior in the upper midrange: It ensures uniform sound radiation across the entire membrane surface, improves air circulation in the pole piece area, and reduces thermal compression during long-term operation. The result is controlled, low-beaming dispersion behavior up to approx. 3–4 kHz, enabling phase-optimized, seamless integration with the tweeter. The impedance curve reflects this quality: The cleanly defined maximum without secondary resonances demonstrates the mechanical precision of the overhang drive system and the dimensional stability of the Hexacone membrane even at high excursions up to Xmax ±2.0 mm electrical / ±5.5 mm mechanical.

The 8-ohm design allows easy driving with common hi-fi amplifiers. The ferrite magnet with 1.15 T and Le = 0.38 mH ensure a stable, predictable load – simple crossover design without elaborate impedance correction. A 4" midwoofer driver with Hexacone membrane and phase plug that behaves in enclosure calculation exactly as it does in simulation – precise, predictable, Made in Germany.

Product Specification

Dimensions and installation
Total Diameter

122 mm

Mounting Cutout Diameter

96 mm

Overall Depth

66 mm

Rim Thickness

6 mm

Weight

1.24 kg

Screw Hole Diameter (Screw / Head)

4.5 mm / 8 mm

Terminal (Negative / Positive)

2.8 mm / 4.8 mm

Voice coil
Diameter

25 mm

Height

10 mm

Wire material

Cu

Carrier material

Kapton

Winding layers

2

Magnetic drive
Magnetic flux density

1.15 T

Air gap height

6 mm

Material

Ferrite

Dimensions

90mm x 36 mm

Drive system

Overhang

Ferrofluid

nein

Technical data
Nominal impedance

Zn = 8 Ohm

DC resistance

Re = 5.9 Ohm

1 W resonance frequency

fr = 60 Hz

TSP resonance frequency

fr = 71 Hz

Suspension compliance

Cms = 0.86 mm/N

Mechanical quality factor

Qms = 5.56

Electrical quality factor

Qes = 0.42

Total quality factor

Qts = 0.39

Mechanical resistance

Rms = 0.50 kg/s

Total moving mass (including moving air mass)

Mmd = 5.8 g

Effective radiating area

Sd = 55 cm²

Voice coil inductance

Le = 0.38 mH

Force factor

BLxl = 5.8 Tm

Electrical Xmax

+/- 2.0 mm

Mechanical Xmax

+/- 5.5 mm

Equivalent volume

Vas = 3.7 dm³

Average sound pressure level 1 W / 1 m

88 dB SPL

Power handling

50 W*


*IEC 60268-5

Downloads

Technical Data Sheet Symphony II 4312

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