Symphony II 4-212/C8/25 HEX
Symphony II 4-212/C8/25 HEX
Symphony II 4-212/C8/25 HEX
Symphony II 4-212/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

±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

±2 mm
±2 mm

linear motion

Vendor:ETON Soundsysteme GmbH

Symphony II 4-212/C8/25 HEX

Der ETON Symphony II 4-212 ist ein 4"-Tiefmittelton-Treiber der Spitzenklasse für audiophile DIY-Lautsprecher-Projekte und Lautsprechermanufakturen, bei denen Hexacone-Membrantechnologie, ein breiter Einsatzbereich und ein agiler, impulstreuer Antrieb gefragt sind. Das Herzstück des Symphony II 4-212 ist die patentierte Hexacone-Membran im Mehrschichtaufbau: die aus der Luft- und Raumfahrttechnik übernommene Wabenstruktur sorgt für eine außergewöhnliche Membransteifigkeit bei gleichzeitig niedriger Masse (Mmd = 6,2 g). Die Hexacone-Membran bleibt auch bei hohen Auslenkungen formstabil – ohne Partialschwingungen und Verzerrungen bei hohen Pegeln. Mit einem Kraftfaktor von BL = 5,8 Tm und einer bewegten Masse von nur 6,2 g liefert der Symphony II 4-212 eine agile, impulstreue Wiedergabe mit präziser Transientendarstellung über den gesamten Einsatzbereich von 69 Hz bis ca. 3 kHz.

Mit einer Resonanzfrequenz von 69 Hz (TSP), einem Qts von 0,39 und einem Äquivalentvolumen von 3,6 dm³ ist der Symphony II 4-212 flexibel für Bassreflex- und geschlossene Gehäuse ab ca. 3–8 Litern ausgelegt. Mit 88 dB Wirkungsgrad, 50 W Belastbarkeit (IEC 60268-5), 122 mm Gesamtdurchmesser und 1,20 kg ist der Symphony II 4-212 der vielseitige 4"-Treiber im Symphony II Sortiment – für kompakte 2-Wege-Systeme, offene Schallwandkonstruktionen und anspruchsvolle 3-Wege-Projekte. Made in Germany, aus der ETON-Manufaktur.

Warum der ETON Symphony II 4-212 für Ihr Projekt?

  • Patentierte Hexacone-Membran im Mehrschichtaufbau: Raumfahrttechnologie im Lautsprecherbau – formstabil bei höchsten Pegeln, linear bei 50 W wie bei 1 W, ohne Partialschwingungen
  • BL = 5,8 Tm / Mmd = 6,2 g / fs 69 Hz (TSP): agiler Antrieb für impulstreue, präzise Wiedergabe von 69 Hz bis ca. 3 kHz
  • Qts 0,39 / Vas 3,6 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
  • Ferrit-Magnet 1,15 T / 25-mm-Cu-Schwingspule / Le = 0,40 mH: kraftvoller Antrieb mit stabiler, berechenbarer Last für einfache Weichenauslegung
  • 122 mm Ø, 66 mm Tiefe, 1,20 kg: kompaktes 4"-Format für enge Einbausituationen und kleine Gehäuse. Made in Germany.

Für DIY-Projekte und Lautsprechermanufakturen, bei denen Hexacone-Membrantechnologie und ein agiler, impulstreuer Antrieb im kompakten 4"-Format gefragt sind – der ETON Symphony II 4-212. Made in Germany, aus der ETON-Manufaktur.

Patented Hexacone diaphragm in a multilayer construction – aerospace technology in loudspeaker design: dimensionally stable at the highest levels, linear at 50 W as at 1 W, without partial vibrations.

Patented Hexacone diaphragm in a multilayer construction – aerospace technology in loudspeaker design: dimensionally stable at the highest levels, linear at 50 W as at 1 W, without partial vibrations.

Qts 0.39 / Vas 3.6 dm³: the only 4" driver in the Symphony II range with true enclosure flexibility – bass reflex or sealed from approx. 3–8 liters, for 2-way and 3-way systems.

Qts 0.39 / Vas 3.6 dm³: the only 4" driver in the Symphony II range with true enclosure flexibility – bass reflex or sealed from approx. 3–8 liters, for 2-way and 3-way systems.

BL = 5.8 Tm / Mmd = 6.2 g / fs 69 Hz (TSP): agile drive for impulse-faithful, precise reproduction from 69 Hz to 3 kHz – the versatile midbass driver in a compact 4" format.

BL = 5.8 Tm / Mmd = 6.2 g / fs 69 Hz (TSP): agile drive for impulse-faithful, precise reproduction from 69 Hz to 3 kHz – the versatile midbass driver in a compact 4" format.

88 dB / 50 W (IEC 60268-5) / 122 mm Ø / 1.20 kg – high efficiency, compact format, ferrite 1.15 T, Le = 0.40 mH. Made in Germany, from the ETON manufactory.

88 dB / 50 W (IEC 60268-5) / 122 mm Ø / 1.20 kg – high efficiency, compact format, ferrite 1.15 T, Le = 0.40 mH. Made in Germany, from the ETON manufactory.

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120,00 EUR

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2-year manufacturer's warranty

Made in Germany

88 dB / Hexacone diaphragm / fs 69 Hz – usable from 69 Hz to 3 kHz, 50 W

The frequency response of the Symphony II 4-212 demonstrates the behavior of a top-class 4" midbass driver with a patented Hexacone cone in a multilayer construction: a uniform, controlled amplitude response from approx. 69 Hz to 3 kHz – with 88 dB efficiency and a stable level structure across the entire transmission range. The Hexacone cone is the decisive factor for this linear frequency response: the honeycomb structure adopted from aerospace technology, with its multilayer construction, remains electrically dimensionally stable even at high excursions up to Xmax ±2.0 mm – without the partial oscillations and peaks in the upper transmission range that occur with conventional cones at high levels. The result is a frequency response that is just as linear at 50 W as it is at 1 W.

Particularly relevant for DIY loudspeaker developers and loudspeaker manufacturers: the usable transmission range of approx. 69 Hz to 3 kHz makes the Symphony II 4-212 a versatile midbass driver for 2-Wege-Systeme with a crossover frequency around 2–3 kHz – directly coupled to a tweeter, with bass-reflex enclosures from approx. 3–8 liters.

In the 3-Wege-System it operates as a midbass driver between a woofer (crossover from approx. 200–400 Hz) and a tweeter (crossover at 2–3 kHz). The Qts of 0.39 and the equivalent volume of 3.6 dm³ are the decisive parameters here: the Symphony II 4-212 is one of the few 4" drivers in the Symphony II range that is suitable for both bass-reflex and sealed enclosures – maximum flexibility in enclosure design.

The uniform frequency response without dips or peaks in the transmission range demonstrates the superior quality of the Hexacone cone and the drive system (BL = 5.8 Tm, ferrite 1.15 T, Le = 0.40 mH). A 4" midbass driver with a Hexacone cone that sounds the way it measures – precise, linear, with genuine aerospace technology inside. Made in Germany, from the ETON manufactory.

Qts 0.39 / fs 69 Hz / BL 5.8 Tm – Hexacone membrane, 50 W, flexible for BR and sealed

The impedance curve of the Symphony II 4-212 shows the behavior of a top-class 4" midwoofer driver with patented multi-layer Hexacone membrane: The impedance maximum is at approx. 69 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 makes the Symphony II 4-212 one of the most flexible drivers in the Symphony II range: It is suitable for both bass reflex enclosures and sealed enclosures from approx. 3–8 liters – depending on the desired tuning characteristics. The force factor BL = 5.8 Tm with a moving mass of only 6.2 g ensures precise, agile drive across the entire transmission range from 69 Hz to approx. 3 kHz.

The multi-layer Hexacone membrane is the acoustic heart of the Symphony II 4-212: The honeycomb structure adopted from aerospace technology provides exceptional bending stiffness combined with low mass. The impedance behavior reflects this quality: The smooth impedance curve without secondary resonances demonstrates the mechanical precision of the overhung 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 ferrite magnet with 1.15 T and the 25-mm copper voice coil on Kapton former (Le = 0.40 mH) ensure a stable, predictable load – simple crossover design without elaborate impedance correction.

Above resonance, the driver behaves electrically stable: The moderate impedance rise due to Le = 0.40 mH is an expected value for a 4" midwoofer driver with a 25-mm voice coil and does not complicate crossover design. The 8-ohm design allows easy driving with common hi-fi amplifiers. A 4" midwoofer driver with Hexacone membrane that behaves in enclosure calculation exactly as it does in simulation – flexible, predictable, Made in Germany.

Product Specification

Dimensions and installation
Total Diameter

122 mm

Cutout Diameter

96 mm

Total Depth

66 mm

Flange Thickness

6 mm

Weight

1,20 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

90 mm x 60 mm

Drive system

Overhang

Ferrofluid

nein

Technical data
Nominal Impedance

Zn = 8 Ohm

DC Resistance

Re = 5.9 Ohm

1 W Resonance Frequency

fr = 57 Hz

Thiele-Small Resonance Frequency

fr = 69 Hz

Suspension Compliance

Cms = 0.84 mm/N

Mechanical Quality Factor

Qms = 5.09

Electrical Quality Factor

Qes = 0.43

Total Quality Factor

Qts = 0.39

Mechanical Resistance

Rms = 0.58 kg/s

Total Moving Mass (including Moving Air Mass)

Mmd = 6.2 g

Effective Radiating Area

Sd = 55 cm²

Voice Coil Inductance

Le = 0.40 mH

Force Factor

BLxl = 5.8 Tm

Electrical Xmax

+/- 2.0 mm

Mechanical Xmax

+/- 5.5 mm

Equivalent Volume

Vas = 3.6 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 4212

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