Poseidon

Selene’s low-frequency foundation.

Compact 16cm subwoofer pair designed exclusively for Selene integration. Extends system response to 50Hz linear (F6 at 35Hz) via zero-phase LR4 crossover at 150Hz. 14.7mm Xmax per direction, 98dB continuous @ 50Hz. Powered directly by Selene’s EXCore.

Extended low-frequency authority

Transforms Selene from F6 at 80Hz to F6 at 35Hz, linear response extends to 50Hz. Full-range monitoring capability from a compact system – the foundation film, music, and immersive audio work demands.

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Serious output from compact drivers

14.7mm of linear excursion in each direction from a 5.5″ driver. More throw than the 9″ drivers in our previous generation Pulsars – 98dB continuous at 50Hz from a 6.5″ cube enclosure.

Seamless system integration

Powered directly by Selene’s EXCore with coordinated DSP calibration. No external amplifiers, no additional processing, no phase misalignment – Poseidon integrates as if it was always part of the design. Because it was.

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Professional performance, minimal footprint

Adds full-range capability without the space requirements of traditional monitoring systems. Compact enough for desktops and small rooms, capable enough for professional decision-making.

DSP

Proprietary, in house calibration code completely flattens frequency, phase and impulse response.

Performance Measurements

Frequency Response (30cm cal position)

Phase Response

THD Ratio (94db at cal position)

TECHNICAL FOUNDATION

Poseidon completes the Selene system by providing dedicated low-frequency extension that Selene’s compact form factor can’t physically deliver. Designed from the outset as part of a modular 3-way architecture, Poseidon integrates with Selene’s EXCore amplification and DSP to create a cohesive monitoring system.

Cabinet Engineering

Poseidon uses the same aluminum extrusion approach as Selene – 7mm flat-wall construction with 19mm corner ribbing, both front and rear baffles are 12mm solid aluminum, all compressed together with series gaskets. The 6.5″ cube form factor matches Selene’s dimensions for visual and acoustic consistency.

Despite the compact enclosure, the cabinet is engineered for the substantial excursion demands of low-frequency reproduction. The rigid aluminum construction prevents cabinet flexing even when the driver is moving through its full 14.7mm of linear travel in each direction.

Driver Technology

Poseidon uses a custom Epique MMAG architecture 16cm subwoofer engineered specifically for this application. The 14.7mm of linear excursion in each direction delivers serious low-frequency capability from a compact driver – more excursion than the 9″ drivers in our previous generation Pulsars.

When integrated with Selene via zero-phase LR4 crossover at 150Hz, the system reaches 50Hz linear with F6 at 35Hz. The driver delivers 98dB continuous @ 50Hz from a 6.5″ cube enclosure. Think of it like adding the foundation a compact monitor can’t provide on its own – the two working together deliver full-range accuracy from a surprisingly small footprint.

System Integration

Each Poseidon is measured and calibrated individually before the complete Selene + Poseidon system receives coordinated calibration. The EXCore DSP applies digital crossovers and time alignment to ensure seamless integration across all crossover points. The result is a system that operates as a unified 3-way, not separate components sharing a room.

Because Poseidon is powered by Selene’s EXCore and receives its calibration from the same DSP, system updates can be applied over-the-air as we refine our measurement processes.

SPECIFICATION OVERVIEW:

PERFORMANCE (AS INTEGRATED SYSTEM WITH SELENE)

System Frequency Response: ±1.5dB 50Hz – 30kHz (linear to 50Hz)

System Low Frequency Extension: F6 at 35Hz

Poseidon Continuous SPL @ 50Hz: 98dB per driver

System Maximum SPL @ 1m: 106dB @ 1kHz

Integration Crossover: 150Hz zero-phase LR4 digital

DRIVER

16cm (6.3″) Epique MMAG subwoofer

Linear Excursion: 14.7mm each direction (Xmax)

AMPLIFICATION

Powered by Selene EXCore: Hypex NCx252MP (dedicated channel per driver)

PHYSICAL
Dimensions: 165mm H x 160mm D x 165mm W (6.5″ cube)
Weight: 6.4kg (14 lbs) per subwoofer
Mounting: Integral hard points, 100×100 or 75×75 MIS-D VESA (M4 fasteners)
Front and rear baffles: 12mm solid aluminum
COMPATIBILITY
Designed exclusively for Selene integration
Requires Selene EXCore for operation
WARRANTY
6 years

TESTIMONIALS

It’s the confidence I get from finally being able to trust my own taste that makes these speakers great. Music is a way composers, engineers, and most importantly listeners communicate and it’s done in such a personal way, the most valuable thing you can do for yourself and your audience is to communicate with conviction. Quasars give me that power.
Richie Beretta in his studio with Ex Machina Soundworks reference monitors

Richie Beretta

Artist, Producer, Engineer
Didn’t realize what I have been missing! After multiple mixes, Pulsars boosted my confidence, I was cranking them out so much faster. It was making mixing so much fun. I submitted some mixes I re-did with Pulsars, and clients were blown away by the differences. I will forever be a proud owner of these.

Joshua Young

Studio Owner, Engineer
If you’re struggling with translation, this will end that battle. The sound staging is insanely hyper accurate. What you hear on these monitors, you will hear on literally any system.

Ryan Harvey

Engineer, Producer
I can hear exactly what I need to do to improve my sound… Quasars are a major tool that help me accomplish this. They are the best thing I’ve bought for my studio in a decade.

Justin Melland

Film Composer
Quasars have become my most valued and crucial piece of equipment. They give me total confidence in knowing how tracking and mixing sessions will translate outside of the room… They provide clarity, transparency, and inspiration.

James Meslin

Recording Engineer, Mixer, Producer
The mid tweet coaxial on these monitors presents a midrange detail like I’ve never heard before. These speakers are far from fatiguing while presenting a pristine midrange and transient response. I’m truly over the moon.

ALEX E

Music Producer, Mixing Engineer
Over the years, I have worked with a number of very good speakers in many studios but the Ex Machina Pulsar takes monitoring to another level. These are truthful tools that you can definitely rely on.

Patrick Derivaz

Bass Player, Composer, Engineer, Producer
Everything translated well and felt balanced, the low end was amazing, I don’t need a sub anymore ! I find that I can work at low volume and hear every detail and also listen loud without fatiguing… The stereo image and center are really defined, I honestly can’t find anything that I don’t like.

Manon Grandjean

Recording, Mixing, Mastering Engineer
The Pulsars have been truly game changing for me. They are super accurate, revealing, and the transient detail is incredible which has made the mixing process much more efficient and allowed for more confident decision making. I couldn’t be more happy with them.

Ryan Leitru

Producer, Songwriter, Mixer