Arcosia 4
Arcosia 4
Arcosia 4
Arcosia 4

Features

87 dB SPL
87 dB SPL

efficiency

70 Hz - 2 kHz
70 Hz - 2 kHz

recommended frequency range

4" | ±100mm
4" | ±100mm

dimensions

magnesium
magnesium

membrane material

±4 mm
±4 mm

linear motion

Features

87 dB SPL
87 dB SPL

efficiency

70 Hz - 2 kHz
70 Hz - 2 kHz

recommended frequency range

4" | ±100mm
4" | ±100mm

dimensions

magnesium
magnesium

membrane material

±4 mm
±4 mm

linear motion

Vendor:ETON Soundsysteme GmbH

Arcosia 4

Der ETON Arcosia 4 ist ein 4"-Midwoofer für audiophile DIY-Projekte, bei denen Kompaktheit, Flexibilität und ein großzügiger Sweet Spot gefragt sind. Mit einem Qts von 0,39 und einer Resonanzfrequenz von 57 Hz (TSP) bewegt sich der Arcosia 4 im Grenzbereich zwischen Bassreflex- und geschlossener Abstimmung – und bietet damit maximale Flexibilität bei der Gehäuseauslegung. Das Äquivalentvolumen von 7,0 dm³ ermöglicht außergewöhnlich kompakte Gehäuse für einen 4"-Treiber.

Im Vergleich zum Arcosia 4 Phase Plug bietet die klassische Ausführung mit Staubschutzkalotte ein breiteres Abstrahlverhalten im oberen Mitteltonbereich – ein Vorteil für Konstruktionen, bei denen ein großzügiger Sweet Spot und eine homogene Energieabgabe im Raum im Vordergrund stehen. Die leichte CCAW-Schwingspule auf Glasfaser-Träger sorgt für schnelle, präzise Impulswiedergabe. Erhältlich in Transparent (4208) und Schwarz (4218). Made in Germany, aus der ETON-Manufaktur.

Warum der ETON Arcosia 4 für Ihr DIY-Projekt?

  • ✦ Klassische Staubschutzkalotte – breiteres Abstrahlverhalten im Mittelton, großzügiger Sweet Spot
  • ✦ Qts 0,39 / fs 57 Hz – flexibel für Bassreflex und geschlossene Gehäuse, Vas 7,0 dm³
  • ✦ CCAW-Schwingspule auf Glasfaser-Träger – leicht, schnell, thermisch belastbar
  • ✦ Xmax ±4,0 mm elektrisch / ±8,2 mm mechanisch – hoher Linearhub für einen 4"-Treiber
  • ✦ Kompaktes Format (122 mm Ø, 75 mm Tiefe, 1,23 kg) – ideal für platzsparende 2-Wege-Systeme
  • ✦ Zwei Varianten: Transparent (4208) und Schwarz (4218) – für offene und geschlossene Gehäusekonzepte

Ob kompaktes 2-Wege-Regal-System, Wandlautsprecher oder audiophiles DIY-Projekt – der ETON Arcosia 4 liefert Manufakturqualität im kleinsten Format. Für Projekte, bei denen ein kontrolliertes Abstrahlverhalten und ein geglätteter Mitteltonfrequenzgang im Vordergrund stehen, empfiehlt sich der Arcosia 4 Phase Plug.

Dust cap dome instead of Phase Plug: Wider midrange dispersion, generous sweet spot – for applications where homogeneous room sound dispersion is the top priority.

Dust cap dome instead of Phase Plug: Wider midrange dispersion, generous sweet spot – for applications where homogeneous room sound dispersion is the top priority.

Xmax ±4.0 mm electrical / ±8.2 mm mechanical – exceptionally high linear motion for a 4" driver that remains low-distortion and controlled even at high levels.

Xmax ±4.0 mm electrical / ±8.2 mm mechanical – exceptionally high linear motion for a 4" driver that remains low-distortion and controlled even at high levels.

Le = 0,35 mH: The low voice coil inductance simplifies crossover design and ensures a stable, predictable load across all standard amplifiers.

Le = 0,35 mH: The low voice coil inductance simplifies crossover design and ensures a stable, predictable load across all standard amplifiers.

Qts 0,39 / Vas 7,0 dm³: Flexible for bass reflex and closed enclosures – compact volumes starting at 4 liters are possible.

Qts 0,39 / Vas 7,0 dm³: Flexible for bass reflex and closed enclosures – compact volumes starting at 4 liters are possible.

Color
Color: transparent
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330,00 EURUnit price(330,00 EUR each)

Pairs well with

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2-year manufacturer's warranty

Made in Germany

Wide radiation pattern in the midrange – usable from 70 Hz to 3 kHz

The frequency response of the Arcosia 4 shows a smooth, controlled amplitude curve from approximately 70 Hz to 3 kHz – with an 87 dB efficiency rating and a stable level structure across the entire transmission range. Compared to the Arcosia 4 Phase Plug, the classic design with a dust cap has a wider radiation pattern in the upper midrange: Energy is radiated more evenly into the room, resulting in a more generous sweet spot and a more uniform sound distribution throughout the listening space – a benefit for designs where wide radiation behavior and natural sound imaging are the top priorities.

Particularly relevant for DIY speaker developers: The usable transmission range up to approximately 3 kHz allows direct pairing with tweeters with crossover frequencies starting at 2.5–3 kHz – with sufficient safety margin and straightforward filter design using 2nd-order filters. In 3-way systems, the Arcosia 4 handles the midrange starting at approximately 300–500 Hz and passes the low-frequency range to a dedicated woofer. The typical 4" cone breakup occurs above approximately 3 kHz – so the crossover frequency should not be selected to be significantly higher.

The smooth frequency response with no dips or peaks across the transmission range confirms the quality of the drive system and suspension. A driver that sounds as it measures – made at the ETON manufacturing facility in Germany.

Qts 0,39 – flexible for bass reflex and closed enclosures

The impedance curve of the Arcosia 4 demonstrates the performance of a precisely tuned 4-inch midwoofer: The impedance peak occurs at the resonant frequency of approximately 57 Hz (TSP) – a balanced value for a 4-inch driver that delivers genuine low-end response in compact dimensions. The Qts value of 0.39 falls within the boundary range between bass reflex and sealed enclosure tuning, offering maximum flexibility for enclosure design: A sealed enclosure from approximately 4–6 liters delivers controlled, transient-accurate bass reproduction; in a bass reflex enclosure from approximately 6–8 liters tuned to 60–65 Hz, the driver unleashes its full low-end response.

Above the resonant frequency, the driver operates with electrical stability: Impedance only rises moderately toward high frequencies due to the voice coil inductance (Le = 0.35 mH) – a low value attributable to the lightweight CCAW voice coil that simplifies crossover design. Compared to the Arcosia 4 Phase Plug (Le = 0.33 mH), the difference is minimal – both drivers can be designed using the same basic principles. The 8-ohm design enables trouble-free operation with standard HiFi and multi-channel amplifiers.

The cleanly defined impedance peak without parasitic resonances confirms the mechanical precision of the overhung drive system and the quality of the suspension. This 4-inch driver behaves identically in enclosure calculations as it does in simulations – reproducible, reliable, Made in Germany.

Product Specification

Dimensions and installation
Overall Diameter

122 mm

Mounting Cutout Diameter

96 mm

Overall Depth

75 mm

Flange Thickness

6 mm

Weight

1.23 kg

Screw Hole Diameter (Screw / Head)

4.5 mm / 8 mm

Terminal (Negative / Positive)

4.8 mm / 6.3 mm

Voice coil
Diameter

25 mm

Height

13 mm

Wire material

CCAW

Support material

Glass fiber

Winding layers

2

Magnetic drive
Magnetic flux density

1.11 T

Air gap height

5 mm

Material

Ferrite

Dimensions

86 mm x 32 mm x 22mm

Drive system

Overhang

Ferrofluid

nein

Technical data
Nominal Impedance

Zn = 8 Ohm

DC Resistance

Re = 5.8 Ohm

1 Watt Resonant Frequency

fr = 53 Hz

TSP Resonant Frequency

fr = 57 Hz

Suspension Compliance

Cms = 1.99 mm/N

Mechanical Quality Factor

Qms = 6.11

Electrical Quality Factor

Qes = 0.42

Total Quality Factor

Qts = 0.39

Mechanical Resistance

Rms = 0.27 kg/s

Total Moving Mass (Including Moving Air Mass)

Mmd = 4.5 g

Effective Radiating Area

Sd = 50 cm²

Voice Coil Inductance

Le = 0.35 mH

Force Factor

BLxl = 4.3 Tm

Electrical Xmax

+/- 4.0 mm

Mechanical Xmax

+/- 8.2 mm

Equivalent Volume

Vas = 7.0 dm³

Average Sound Pressure Level 1 W / 1 m

87 dB SPL

Power Handling

50 W*


*IEC 60268-5

Downloads

Technical Data Sheet Arcosia 4208 (transparent)

Technical Data Sheet Arcosia 4218 (black)

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