Arcosia 4-Phase Plug
Arcosia 4-Phase Plug
Arcosia 4-Phase Plug
Arcosia 4-Phase Plug

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

Phase Plug
Phase Plug

Optimized Treble

±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

Phase Plug
Phase Plug

Optimized Treble

±4 mm
±4 mm

linear motion

Vendor:ETON Soundsysteme GmbH

Arcosia 4-Phase Plug

Der ETON Arcosia 4 Phase Plug ist ein 4"-Midwoofer für audiophile DIY-Projekte, bei denen Kompaktheit und Präzision gleichzeitig gefordert sind. Mit einem Qts von 0,39 und einer Resonanzfrequenz von 58 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 nur 6,6 dm³ ermöglicht außergewöhnlich kompakte Gehäuse für einen 4"-Treiber.

Der integrierte Phase Plug optimiert das Abstrahlverhalten im Mitteltonbereich und reduziert thermische Kompression der Schwingspule – entscheidend bei einem kompakten Treiber, der in 2-Wege-Systemen mit höherer Trennfrequenz eingesetzt wird. Die leichte CCAW-Schwingspule auf Glasfaser-Träger sorgt für schnelle, präzise Impulswiedergabe. Erhältlich in Transparent (4308) und Schwarz (4318). Made in Germany, aus der ETON-Manufaktur.

Warum der ETON Arcosia 4 Phase Plug für Ihr DIY-Projekt?

  • ✦ Phase Plug – optimiertes Abstrahlverhalten im Mittelton, reduzierte thermische Kompression
  • ✦ Qts 0,39 / fs 58 Hz – flexibel für Bassreflex und geschlossene Gehäuse, Vas nur 6,6 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, 1,28 kg) – ideal für platzsparende 2-Wege-Systeme
  • ✦ Zwei Varianten: Transparent (4308) und Schwarz (4318) – für offene und geschlossene Gehäusekonzepte

Ob kompaktes 2-Wege-Regal-System, Wandlautsprecher oder anspruchsvolles Nahfeld-Monitor-Projekt – der ETON Arcosia 4 Phase Plug liefert Manufakturqualität im kleinsten Format. Für Projekte, bei denen ein breiteres Abstrahlverhalten im Vordergrund steht, empfiehlt sich der Arcosia 4 ohne Phase Plug.

Phase Plug + proven TSP base: precise midrange and true deep bass in exceptionally compact enclosures starting at 5 liters.

Phase Plug + proven TSP base: precise midrange and true deep bass in exceptionally compact enclosures starting at 5 liters.

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

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

The Phase Plug optimizes radiation behavior in the midrange and smooths the frequency response up to 3.5 kHz – for precise detail imaging and seamless integration.

The Phase Plug optimizes radiation behavior in the midrange and smooths the frequency response up to 3.5 kHz – for precise detail imaging and seamless integration.

Le = 0,33 mH: The low voice coil inductance simplifies crossover design and ensures a stable, predictable load across all standard amplifiers.

Le = 0,33 mH: The low voice coil inductance simplifies crossover design and ensures a stable, predictable load across all standard amplifiers.

Color
Color: transparent
In stock, ready to ship
340,00 EURUnit price(340,00 EUR each)

Pairs well with

Fast shipping

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2-year manufacturer's warranty

Made in Germany

Linear midrange thanks to Phase Plug – usable from 70 Hz to 3.5 kHz

The frequency response of the Arcosia 4 Phase Plug demonstrates what a compact 4"-midwoofer with a phase plug from ETON Manufacturing is capable of: a smooth, controlled amplitude curve from approximately 70 Hz to 3.5 kHz – with 87 dB efficiency and without the typical upper midrange peaks that many 4" drivers without a phase plug exhibit. The phase plug optimizes midrange radiation characteristics and smooths the transition between the piston-driven low-frequency range and the increasingly directional upper midrange – particularly relevant for a 4" driver used in 2-way systems with higher crossover frequencies.

Particularly relevant for DIY developers: The usable frequency range up to approximately 3.5 kHz allows direct pairing with tweeters with crossover frequencies starting at 3 kHz – with ample safety margin and straightforward filter design. In 3-way systems, the Arcosia 4 handles the midrange from approximately 300–500 Hz and passes the low-frequency range to a dedicated woofer. Typical 4" driver directionality sets in above approximately 3 kHz – a physically expected behavior that should be accounted for when selecting crossover frequencies.

The consistent off-axis radiation behavior – made possible by the phase plug – ensures uniform energy distribution throughout the listening space and stable stage imaging even in compact enclosures. A driver that sounds as true to its measured performance as this one – manufactured by ETON in Germany.

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

The impedance curve of the Arcosia 4 shows the behavior of a precisely tuned 4" mid-woofer: The impedance maximum occurs at the resonance frequency of approximately 58 Hz (TSP) – for a 4" driver, this is a balanced value that delivers genuine low-end response in compact dimensions.

The Qts value of 0.39 is the critical design parameter: It sits at the boundary between bass reflex and sealed enclosure tuning, offering maximum flexibility in enclosure design. The equivalent volume of just 6.6 dm³ enables exceptionally compact enclosures – a clear advantage over larger drivers in this class.

Above the resonance frequency, the driver behaves electrically stably: Impedance only rises moderately toward high frequencies due to the voice coil inductance (Le = 0.33 mH) – a very low value attributable to the lightweight CCAW voice coil that simplifies crossover design. The 8-ohm design enables trouble-free operation with standard HiFi and multi-channel amplifiers, in both passive and active setups.

The cleanly defined impedance maximum without parasitic resonances confirms the mechanical precision of the overhung drive system and the quality of the suspension. This 4" 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

Cutout diameter

96 mm

Overall depth

75 mm

Flange thickness

6 mm

Weight

1,28 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

Carrier 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 = 5.7 Ohm

1 W Resonant Frequency

fr = 55 Hz

TSP Resonant Frequency

fr = 58 Hz

Suspension Compliance

Cms = 1.86 mm/N

Mechanical Quality Factor

Qms = 6.48

Electrical Quality Factor

Qes = 0.41

Total Quality Factor

Qts = 0.39

Mechanical Resistance

Rms = 0.25 kg/s

Total Moving Mass (including moving air mass)

Mmd = 4.0 g

Effective Radiating Area

Sd = 50 cm²

Voice Coil Inductance

Le = 0.33 mH

Force Factor

BLxl = 4.3 Tm

Electrical Xmax

+/- 4.0 mm

Mechanical Xmax

+/- 8.2 mm

Equivalent Volume

Vas = 6.6 dm³

Average Sound Pressure Level 1 W / 1 m

87 dB SPL

Power Handling

50 W*


*IEC 60268-5

Downloads

Technical Data Sheet Arcosia 4308 (transparent)

Technical Data Sheet Arcosia 4318 (black)

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