Symphony II 7-212/C8/32 HEX
Symphony II 7-212/C8/32 HEX
Symphony II 7-212/C8/32 HEX
Symphony II 7-212/C8/32 HEX

Features

89 dB SPL
89 dB SPL

efficiency

50 Hz - 3 kHz
50 Hz - 3 kHz

recommended frequency range

7" | ±180mm
7" | ±180mm

dimensions

Fiber optic
Fiber optic

Membrane material

±4.5 mm
±4.5 mm

linear motion

Features

89 dB SPL
89 dB SPL

efficiency

50 Hz - 3 kHz
50 Hz - 3 kHz

recommended frequency range

7" | ±180mm
7" | ±180mm

dimensions

Fiber optic
Fiber optic

Membrane material

±4.5 mm
±4.5 mm

linear motion

Vendor:ETON Soundsysteme GmbH

Symphony II 7-212/C8/32 HEX

Der ETON Symphony II 7-212 ist ein 7"-Tiefton-Treiber der Spitzenklasse für audiophile DIY-Lautsprecher-Projekte und Lautsprechermanufakturen, bei denen Hexacone-Membrantechnologie, pegelfester Tiefgang bis unter 35 Hz und ein kraftvoller Antrieb gefragt sind. Das Herzstück des Symphony II 7-212 ist die patentierte Hexacone-Membran im Mehrschichtaufbau: Die aus der Luft- und Raumfahrttechnik übernommene Wabenstruktur kombiniert eine außergewöhnliche Biegesteifigkeit mit einer effektiven Abstrahlfläche von Sd = 137 cm² – auch bei hohen Auslenkungen bis Xmax ±4,5 mm elektrisch bleibt die Membran formstabil, ohne Partialschwingungen und Verzerrungen bei hohen Pegeln. Der starke Kraftfaktor BL = 8,8 Tm bei einer bewegten Masse von 17,9 g gewährleistet einen präzisen, kontrollierten Antrieb auch bei tiefen Frequenzen unter 40 Hz – für eine pegelfeste, tiefreichende Basswiedergabe bei 80 W Belastbarkeit (IEC 60268-5).

Mit einer Resonanzfrequenz von 35 Hz (TSP), einem Qts von 0,29 und einem Äquivalentvolumen von 31,0 dm³ ist der Symphony II 7-212 ein echter Tiefton-Treiber für Bassreflexgehäuse ab ca. 30–60 Litern. Der niedrige Qts von 0,29 macht ihn besonders geeignet für Bassreflexkonstruktionen mit tiefer Abstimmung für Tiefgang weit unter 35 Hz. Mit 89 dB Wirkungsgrad, 181 mm Gesamtdurchmesser und 1,95 kg ist der Symphony II 7-212 der leistungsfähigste Tiefton-Treiber im Symphony II Sortiment – für 2-Wege- und 3-Wege-Systeme mit subwooferähnlichem Tiefgang und Hexacone-Membranqualität. Made in Germany, aus der ETON-Manufaktur.

Warum der ETON Symphony II 7-212 für Ihr Projekt?

  • Patentierte Hexacone-Membran im Mehrschichtaufbau: Raumfahrttechnologie im Lautsprecherbau – formstabil auch bei ±8,8 mm mechanischem Xmax, linear bei 80 W wie bei 1 W, ohne Partialschwingungen
  • BL = 8,8 Tm / fs 35 Hz (TSP) / Sd = 137 cm²: kraftvoller Antrieb mit großzügiger Membranfläche für subwooferähnlichen Tiefgang im 7"-Format
  • Qts 0,29 / Vas 31,0 dm³ / Xmax ±4,5 mm elektrisch / ±8,8 mm mechanisch: ideal für Bassreflexgehäuse ab ca. 30–60 Litern – tiefer Rolloffpunkt, hoher linearer Hub
  • 89 dB / 80 W (IEC 60268-5) / 32-mm-Cu-Schwingspule / Ferrit 1,00 T: hoher Wirkungsgrad und thermische Reserven für pegelfeste Wiedergabe bei hohen Lautstärken
  • Le = 0,90 mH / Re = 6,7 Ohm / Zn = 8 Ohm: stabile, berechenbare Last – verstärkerfreundliches 8-Ohm-Design für gängige HiFi-Verstärker
  • 181 mm Ø, 87 mm Tiefe, 1,95 kg: kompaktes 7"-Format für 2-Wege- und 3-Wege-Systeme mit echtem Tiefgang. Made in Germany.

Für DIY-Projekte und Lautsprechermanufakturen, bei denen Hexacone-Membrantechnologie und subwooferähnlicher Tiefgang im kompakten 7"-Format gefragt sind – der ETON Symphony II 7-212. Made in Germany, aus der ETON-Manufaktur.

Patented Hexacone diaphragm in a multilayer construction – aerospace technology in loudspeaker design: dimensionally stable even at Xmax ±8.8 mm mechanically, linear at 80 W as at 1 W, without partial vibrations at low frequencies below 40 Hz.

Patented Hexacone diaphragm in a multilayer construction – aerospace technology in loudspeaker design: dimensionally stable even at Xmax ±8.8 mm mechanically, linear at 80 W as at 1 W, without partial vibrations at low frequencies below 40 Hz.

BL = 8.8 Tm / fs 35 Hz (TSP) / Sd = 137 cm² / Qts 0.29: powerful motor, generous cone area, and very low Qts for subwoofer-like deep bass well below 35 Hz – bass reflex enclosures from approx. 30–60 liters.

BL = 8.8 Tm / fs 35 Hz (TSP) / Sd = 137 cm² / Qts 0.29: powerful motor, generous cone area, and very low Qts for subwoofer-like deep bass well below 35 Hz – bass reflex enclosures from approx. 30–60 liters.

Xmax ±4.5 mm electrical / ±8.8 mm mechanical / 80 W (IEC 60268-5): high linear excursion and thermal reserves for level-stable, low-distortion bass reproduction even at high volumes.

Xmax ±4.5 mm electrical / ±8.8 mm mechanical / 80 W (IEC 60268-5): high linear excursion and thermal reserves for level-stable, low-distortion bass reproduction even at high volumes.

89 dB / 181 mm Ø / 1.95 kg / 32 mm copper voice coil / ferrite 1.00 T – high efficiency, compact 7" format for 2-way & 3-way systems. Made in Germany, from the ETON manufactory.

89 dB / 181 mm Ø / 1.95 kg / 32 mm copper voice coil / ferrite 1.00 T – high efficiency, compact 7" format for 2-way & 3-way systems. Made in Germany, from the ETON manufactory.

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2-year manufacturer's warranty

Made in Germany

89 dB / Hexacone diaphragm / fs 35 Hz – usable from 35 Hz to 1–1.5 kHz, 80 W

The frequency response of the Symphony II 7-212 shows the behavior of a top-class 7" woofer with patented Hexacone cone in multilayer construction: a uniform, controlled amplitude response from approx. 35 Hz to 1–1.5 kHz – with 89 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 in multilayer construction remains dimensionally stable even at the high excursions that physically occur with a 7" woofer at low frequencies below 40 Hz and 80 W – without partial oscillations or peaks under load. The result is a frequency response that is just as linear at 80 W as it is at 1 W.

Particularly relevant for DIY loudspeaker developers and loudspeaker manufacturers: the usable transmission range of approx. 35 Hz to 1–1.5 kHz makes the Symphony II 7-212 the woofer of choice for 2-Wege-Systeme with crossover frequency around 1–1.5 kHz – directly coupled to a midrange or tweeter, in bass-reflex enclosures from approx. 30–60 liters with tuning around 25–35 Hz for deep bass extension well below 35 Hz.

In the 3-Wege-System it operates as a pure woofer with crossover at approx. 200–500 Hz – for high-output, deep-reaching bass reproduction with true subwoofer-like low-end extension. The low Qts of 0.29 and the equivalent volume of 31.0 dm³ are the decisive parameters here: precise, calculable enclosure design for maximum bass extension in the chosen enclosure volume.

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 = 8.8 Tm, ferrite 1.00 T, Le = 0.90 mH, Sd = 137 cm²). A 7" woofer with Hexacone cone that sounds the way it measures – deep, linear, with genuine aerospace technology inside. Made in Germany, from the ETON manufactory.

Qts 0.29 / fs 35 Hz / BL 8.8 Tm – Hexacone membrane, 80 W, bass reflex from 30–60 L

The impedance curve of the Symphony II 7-212 shows the behavior of a top-class 7" woofer with patented multi-layer Hexacone cone: The impedance peak is at approx. 35 Hz (TSP) – the tuning basis for subwoofer-like bass extension well below 35 Hz in a bass-reflex enclosure. The Qts value of 0.29 and the equivalent volume of 31.0 dm³ clearly position the driver as a bass-reflex driver for enclosures from approx. 30–60 liters with low tuning. The force factor BL = 8.8 Tm with an effective radiating area of Sd = 137 cm² and a moving mass of 17.9 g ensures powerful, precise drive even at the high excursions that physically occur at low frequencies below 40 Hz – safely up to Xmax ±4.5 mm electrical / ±8.8 mm mechanical at 80 W (IEC 60268-5).

The multi-layer Hexacone cone is the acoustic heart of the Symphony II 7-212: The honeycomb structure adopted from aerospace technology provides exceptional bending stiffness while maintaining controlled mass – crucial for a linear frequency response even at the high excursions that occur in the bass range below 40 Hz at 80 W. The impedance behavior reflects this quality: The cleanly defined impedance peak without secondary resonances demonstrates the mechanical precision of the overhung drive system and the dimensional stability of the Hexacone cone. The ferrite magnet (102 mm × 46 mm, 1.00 T) and the 32-mm copper voice coil on Kapton former (Le = 0.90 mH) ensure a thermally stable, predictable load in long-term operation.

The 8-ohm design allows easy driving with common hi-fi amplifiers. The impedance rise due to Le = 0.90 mH is an expected value for a 7" woofer with a 32-mm voice coil – the Symphony II 7-212 is typically operated with a crossover at approx. 500 Hz–1.5 kHz, well below the range where Le complicates crossover design. A 7" woofer with Hexacone cone that behaves in enclosure calculation exactly as it does in simulation – precise, predictable, Made in Germany.

Product Specification

Dimensions and installation
Overall Diameter

181 mm

Mounting Hole Diameter

151.5 mm

Total Depth

87 mm

Rim Thickness

7.5 mm

Weight

1.95 kg

Screw Hole Diameter (Screw / Head)

5.2 mm / 9 mm

Terminal (Negative / Positive)

2.8 mm / 4.8 mm

Voice coil
Diameter

32 mm

Height

17 mm

Wire material

Cu

Substrate material

Kapton

Winding layers

1

Magnetic drive
Magnetic flux density

1.00 T

Air gap height

8 mm

Material

Ferrite

Dimensions

102 mm x 46 mm

Drive system

Overhang

Ferrofluid

nein

Technical data
Nominal Impedance

Zn = 8 Ohm

DC Resistance

Re = 6.7 Ohm

1 W Resonance Frequency

fr = 33 Hz

TSP Resonance Frequency

fr = 35 Hz

Suspension Compliance

Cms = 1.18 mm/N

Mechanical Quality Factor

Qms = 6.00

Electrical Quality Factor

Qes = 0.31

Total Quality Factor

Qts = 0.29

Mechanical Resistance

Rms = 0.70 kg/s

Total Moving Mass (including Moving Air Mass)

Mmd = 17.9 g

Effective Radiating Area

Sd = 137 cm²

Voice Coil Inductance

Le = 0.90 mH

Force Factor

BLxl = 8.8 Tm

Electrical Xmax

+/- 4.5 mm

Mechanical Xmax

+/- 8.8 mm

Equivalent Volume

Vas = 31.0 dm³

Average Sound Pressure Level 1 W / 1 m

89 dB SPL

Power Handling

80 W*


*IEC 60268-5

Downloads

Technical Data Sheet Symphony II 7212

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