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Arcturus 3/4 view
Flagship , Soffit-mount & Free-standing Mains , 16cm (6") coax , Twin 26cm (10") subwoofers
Arcturus
The search ends here.

The room deserves the same standard as the session.

Signal active
Freq. Response
±1dB   28Hz–30kHz
LF Cutoff
18Hz at -6dB
Max SPL
117dB continuous
Phase Response
±15°   20Hz–30kHz
Subwoofers
Twin26cm SEAS Extreme
01
28
Linear to 28Hz

±1dB from 28Hz to 30kHz. -6dB at 18Hz. When the room is large and the program material is demanding, Arcturus delivers the complete picture without compression, without strain, without the low end disappearing into the floor.

02
117
Headroom for any room

117dB continuous at 1kHz, 112dB at 50Hz. The headroom to fill a large control room at reference levels without the system working hard. When the monitor is at its limit, decisions suffer. Arcturus stays composed at levels where other systems start to compress.

03
Twin
The best subwoofers we have measured

Twin 26cm SEAS Extreme Series subwoofers with split-gap twin ring radial neodymium motors. Exceptional symmetry and motor strength even at extreme excursions. The lowest distortion, most linear low-frequency transducers available at any price point.

04
90
Every seat in the room

90° conical coverage from the coaxial mid/tweeter. The same accuracy at the mix position, at the producer couch, at the rear of the room. Decisions made anywhere in the room translate. Arcturus doesn't have a sweet spot. It has a sweet room.

Technical Foundation

Not merely the largest. The most advanced.

Arcturus deploys the same coaxial and axisymmetric design philosophy as the rest of the range, with unique twin ring radial neodymium SEAS subwoofers that represent the pinnacle of our R&D. Primarily intended for soffit-installed mains applications, available in straight wall or rounded edge versions for soffit-install or free-standing operation. The same living calibration architecture as Terra and Selene. Individual driver corrections improve over time. Your Arcturus gets better as our research advances. At this level, that matters. Each Arcturus is measured and calibrated at 50cm. The calibration achieves ±1dB frequency response and ±15° phase deviation from 20Hz to 30kHz.
Cabinet Engineering

Sealed Valchromat. Engineered for twin 26cm subwoofers.

Sealed Valchromat cabinets, stiff, dense, and well damped, with none of the chuffing or group delay of ported designs. The 38mm laminated front baffle handles the impressive output of the twin 26cm subwoofers without deflection. Radiused insets for the subwoofers eliminate potential lip shadow from the tall-boy surrounds. Sealed design means the low-frequency rolloff is controlled and predictable. No port resonances, no one-note bass, no group delay artifacts in the critical 30-100Hz region where the most important decisions are made. What you hear is what’s there. Available in straight wall or rounded edge versions to accommodate either soffit-install or free-standing operation. The 2RU remote amplifier/DSP pack requires 1RU clearance top and bottom for ventilation.
Driver Technology

Twin SEAS Extreme Series. The TeXtreme coaxial. The best of everything.

The 176mm coaxial midrange/tweeter uses Composite Sound Metamodal TeXtreme diaphragms: ultralight, ultra-stiff carbon fabrics with optimized fiber geometries to actively control and suppress resonances. Mathematically optimal midrange waveguide shape, underhung surround, and optimized point-source acoustic center alignment. State of the art super low distortion neodymium motor design. The twin 270mm SEAS Extreme Series subwoofers feature a unique split-gap twin ring radial neodymium motor architecture delivering exceptional symmetry and motor strength even at extreme excursions. Simply the best 26cm subwoofers we have heard or measured. Flagship AKM Velvet Sound conversion, Hypex Ncore amplification, 5th gen SHARC+ DSP. Every driver is measured individually and linearized before crossover application. The result: ±1dB frequency response from 28Hz to 30kHz, ±15° phase deviation from 20Hz to 30kHz.
Electronics & DSP

Hypex Ncore. AKM Velvet Sound. 5th gen SHARC+. Nothing held back.

Amplification is Hypex NCAS500MP , 800W RMS for the subwoofers, 100W RMS each for midrange and tweeter. Conversion via flagship AKM Velvet Sound AK4493EQ DAC and AK5572EN ADC. 5th generation SHARC+ DSP (AD21565) processes the crossovers, calibration, and time alignment. The electronics live in an included 2RU remote amplifier/DSP pack , separate from the cabinet for installation flexibility. Input sensitivity is 8Vrms to full scale by default, with an optional high-gain 2Vrms configuration. 1RU clearance top and bottom required="required" for ventilation. Crossovers at 200Hz and 2kHz , digital 4th order phase corrected. Input options include 8Vrms standard sensitivity and 2Vrms optional high-gain configuration.
Performance Measurements

We publish everything.
Make of it what you will.

Every Arcturus is individually measured and calibrated before it ships. Frequency response, phase response, impulse response, polar response, and THD, all measured at the calibration position.

Frequency Response
Frequency Response
Phase Response
Phase Response
Impulse Response
Impulse Response
THD Ratio 94dB
THD Ratio 94dB
THD Power Average
THD Power Average
RMS Level — Angle vs Frequency
RMS Level — Angle vs Frequency
Horizontal Polar
Horizontal Polar
Vertical Polar
Vertical Polar
Full Specifications

Every number,
verified.

Performance
Frequency Response ±1dB, 28Hz–30kHz (at 50cm)
LF Cutoff -6dB at 18Hz
Phase Response ±15°, 20Hz–30kHz
Max SPL @ 1m 117dB continuous
Max LF SPL @ 1m 112dB @ 50Hz
THD+N @ 94dB <0.5% power avg, 100Hz–30kHz
Coverage Angle 90° conical
Driver Complement
Coaxial Mid/HF 176mm SEAS/Ex Machina TeXtreme coaxial
Subwoofers Hypex NCAS500MP, 800W RMS
Sub/Mid Crossover 200Hz, digital 4th order phase corrected
Mid/HF Crossover 2kHz, digital 4th order phase corrected
Amplification
Subwoofers Hypex NCAS500MP, 800W RMS
Midrange Hypex NCAS500MP, 100W RMS
Tweeter Hypex NCAS500MP, 100W RMS
DSP & Conversion
DSP 5th gen SHARC+ AD21565
DAC AKM AK4493EQ (Velvet Sound)
ADC AKM AK5572EN
Input Sensitivity
Standard 8Vrms to full scale
High gain (optional) 2Vrms to full scale
Physical
Cabinet dimensions 839 x 338 x 355mm (33 x 13.3 x 14 in)
Amp/DSP pack 2RU remote unit, 5kg (11 lbs)
Ventilation required 1RU above and below amp pack
Cabinet options Straight wall (soffit-install) or rounded edge (free-standing)
Cabinet material Sealed Valchromat, 38mm laminated front baffle
Installation

Soffit-install or
free-standing.

Electronics / DSP pack
Installation Options
Two configurations.
Built for how you work.

Straight wall version designed for soffit installation. Rounded edge version for free-standing operation. Both configurations deliver identical acoustic performance. The 2RU remote amplifier/DSP pack mounts separately, requiring 1RU clearance top and bottom for ventilation.

Soffit-installStraight wall cabinet
Free-standingRounded edge cabinet
Amp/DSP pack2RU remote unit, mounts separately
Ventilation1RU clearance top and bottom required
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Arcturus

When the room is the instrument,
the search ends here.

Precision. Not Prestige.
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