Arcosia 7 Phase Plug
Arcosia 7 Phase Plug
Arcosia 7 Phase Plug
Arcosia 7 Phase Plug

Features

89 dB SPL
89 dB SPL

efficiency

50 Hz - 3 kHz
50 Hz - 3 kHz

recommended frequency range

7" | ±180mm
7" | ±180mm

dimensions

magnesium
magnesium

membrane material

Phase Plug
Phase Plug

Optimized Treble

±5.5 mm
±5.5 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

magnesium
magnesium

membrane material

Phase Plug
Phase Plug

Optimized Treble

±5.5 mm
±5.5 mm

linear motion

Vendor:ETON Soundsysteme GmbH

Arcosia 7 Phase Plug

Der ETON Arcosia 7 ist kein gewöhnlicher Midwoofer. Der 7"-Treiber mit Phase Plug vereint eine außergewöhnlich tiefe Resonanzfrequenz von 32 Hz mit einem kontrollierten Qts von 0,31 – die Basis für eine präzise, berechenbare Systemintegration in Bassreflex- oder geschlossenen Gehäusen. Das Ergebnis: tiefer, konturierter Bass mit sauberem Übergang in den Mitteltonbereich, ohne die Unschärfe, die viele Breitband-Midwoofer im unteren Übertragungsbereich zeigen.

Der integrierte Phase Plug optimiert das Abstrahlverhalten im Mitteltonbereich und reduziert thermische Kompression der Schwingspule – eine konstruktive Maßnahme, die sich in einem gleichmäßigeren Frequenzgang und höherer Langzeitbelastbarkeit niederschlägt. Ferrit-Antrieb im Überhang-System, 32-mm-Schwingspule auf Glasfaser-Träger, Xmax elektrisch ±5,5 mm. Erhältlich in Schwarz (7318) und Transparent (7308). Made in Germany, aus der ETON-Manufaktur.

Warum der ETON Arcosia 7 für Ihr DIY-Projekt?

  • ✦ Phase Plug – optimiertes Abstrahlverhalten im Mittelton, reduzierte thermische Kompression
  • ✦ Resonanzfrequenz 32 Hz / Qts 0,31 – ideal für Bassreflex- und geschlossene Gehäuse, präzise berechenbar
  • ✦ Xmax ±5,5 mm elektrisch / ±9,5 mm mechanisch – hoher Linearhub für verzerrungsarme Basswiedergabe
  • ✦ 32-mm-Schwingspule auf Glasfaser-Träger – thermisch belastbar, mechanisch stabil
  • ✦ Vas = 32,5 dm³ – kompaktes Äquivalentvolumen für einen 7"-Treiber, kleinere Gehäuse möglich
  • ✦ Zwei Varianten: Schwarz (7318) und Transparent (7308) – für offene und geschlossene Gehäusekonzepte

Ob präzises 2-Wege-System, anspruchsvolles 3-Wege-Konzept oder audiophiles DIY-Lautsprecher-Projekt auf Reference-Niveau – der ETON Arcosia 7 setzt den Maßstab für das, was ein 7"-Midwoofer aus einer Lautsprecher-Manufaktur leisten kann.

Phase Plug instead of dust cap: controlled midrange radiation pattern, smoothed frequency response up to 3.5 kHz – for precise two-way systems with higher crossover frequency.

Phase Plug instead of dust cap: controlled midrange radiation pattern, smoothed frequency response up to 3.5 kHz – for precise two-way systems with higher crossover frequency.

Xmax ±5.5 mm electrical / ±9.5 mm mechanical – high linear excursion for a 7" driver that stays low-distortion and controlled even at high sound levels and low frequencies.

Xmax ±5.5 mm electrical / ±9.5 mm mechanical – high linear excursion for a 7" driver that stays low-distortion and controlled even at high sound levels and low frequencies.

BL = 8,2 Tm bei Mmd = 16,0 g: Powerful, precise drive with fast impulse response – the foundation for contoured bass and clean midrange transitions.

BL = 8,2 Tm bei Mmd = 16,0 g: Powerful, precise drive with fast impulse response – the foundation for contoured bass and clean midrange transitions.

Qts 0,31 / Vas 32,5 dm³: Flexible for bass reflex and closed enclosures – compact equivalent volume for a 7" driver, smaller enclosures are possible.

Qts 0,31 / Vas 32,5 dm³: Flexible for bass reflex and closed enclosures – compact equivalent volume for a 7" driver, smaller enclosures are possible.

Color
Color: black
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540,00 EURUnit price(540,00 EUR each)

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2-year manufacturer's warranty

Made in Germany

Linear midrange thanks to Phase Plug – usable from 40 Hz to 2.5 kHz

The frequency response of the Arcosia 7 demonstrates what a 7" midwoofer fitted with a phase plug from ETON is capable of: a smooth, controlled amplitude curve from approximately 40 Hz to 2.5 kHz – with an 89 dB efficiency rating and none of the typical upper midrange peaks that many drivers in this size class exhibit. The phase plug plays a critical role here: it optimizes midrange radiation performance and smooths the transition between the piston-driven low-frequency range and the increasingly directional midrange band.

Particularly relevant for DIY enthusiasts: the usable frequency range up to approximately 2.5 kHz allows direct pairing with tweeters with crossover start frequencies of 2 kHz – ideal for high-end 2-way speaker designs. In 3-way systems, the Arcosia 7 handles the midrange band from roughly 200–300 Hz, routing the low-frequency signal to a dedicated subwoofer or woofer. The typical 7-inch driver beam pattern becomes apparent above approximately 2 kHz – a physically predictable behavior that should be factored into your crossover frequency selection.

Consistent off-axis radiation performance – made possible by the phase plug – ensures uniform energy dispersion across the listening space and a stable, precise soundstage. This is a driver that sounds exactly as it measures – manufactured at the ETON factory in Germany.

Qts 0.31 – precisely calculable for bass reflex and closed enclosures

The impedance curve of the Arcosia 7 shows the behavior of a carefully tuned 7-inch midwoofer: The impedance maximum occurs at the resonant frequency of approximately 36 Hz (TSP) – exceptionally deep for a driver of this size class. The Qts value of 0.31 is the critical design parameter: It clearly positions the Arcosia 7 in the bass reflex tuning range, but it is also suitable for sealed enclosures with a correspondingly larger volume. For the DIY developer, this means precise, calculable system design without compromises.

Above resonance, the driver behaves electrically stably: The impedance rises moderately toward high frequencies due to the voice coil inductance (Le = 0.87 mH) – this is an expected and easily manageable value for a midwoofer with a 32 mm voice coil. The 8-ohm design allows trouble-free operation with common HiFi and multi-channel amplifiers, both in passive and active setups.

The cleanly defined impedance maximum without secondary resonances or irregularities confirms the mechanical precision of the overhung drive system and the quality of the suspension. A driver that behaves in enclosure calculations exactly as it does in simulations – reproducible, reliable, Made in Germany.

Product Specification

Dimensions and installation
Total Diameter

181 mm

Cutout Diameter

150 mm

Total Depth

96.6 mm

Flange Thickness

6 mm

Weight

2.67 kg

Screw Hole Diameter (Screw / Head)

5 mm / 9 mm

Terminal (Negative / Positive)

4.8 mm / 6.3 mm

Voice coil
Diameter

32 mm

Height

17 mm

Wire material

CU

Support material

Fiberglass

Winding layers

1

Magnetic drive
Magnetic flux density

1.26 T

Air gap height

6 mm

Material

Ferrite

Dimensions

121 mm x 50 mm x 20 mm

Drive system

Overhang

Ferrofluid

nein

Technical data
Nominal Impedance

Zn = 8 Ohm

DC Resistance

Re = 6.6 Ohm

Resonant Frequency 1 W

fr = 32 Hz

Resonant Frequency TSP

fr = 36 Hz

Suspension Compliance

Cms = 1.23 mm/N

Mechanical Quality Factor

Qms = 6.33

Electrical Quality Factor

Qes = 0.32

Total Quality Factor

Qts = 0.31

Mechanical Resistance

Rms = 0.62 kg/s

Total Moving Mass (including moving air mass)

Mmd = 16.0 g

Effective Radiating Area

Sd = 137 cm²

Voice Coil Inductance

Le = 0.87 mH

Force Factor

BLxl = 8.2 Tm

Electrical Xmax

+/- 5.5 mm

Mechanical Xmax

+/- 9.5 mm

Equivalent Volume

Vas = 32.5 dm³

Average Sound Pressure Level 1 W / 1 m

89 dB SPL

Power Handling

100 W*


*IEC 60268-5

Downloads

Technical Data Sheet Arcosia 7308 (transparent)

Technical Data Sheet Arcosia 7318 (black)

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