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Poseidon , front view
Passive , 15cm (5.5") bass extension pair , Selene system expansion
Poseidon
...but sometimes you need it to go deeper.

Your nearfields. Full range. No asterisk.

Buy Poseidon View Specs
Signal active
System Freq.
50Hz linear (F6 at 35Hz)
LF SPL
98dB continuous @ 50Hz
Crossover
150Hz, zero-phase LR4
Xmax
14.7mm each direction
Design
Passive , powered by Selene EXCore
Product Photography

More excursion than
drivers twice its size.

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Technical Foundation

Same engineering philosophy as Selene.
Lower.

Selene bottoms out at F6 around 80Hz. That’s honest. A 6.5-inch cube has physical limits. Poseidon removes those limits without removing anything you already trust about the system. The imaging stays intact. The point-source coherence stays intact. What changes is where the floor is.

Poseidon connects to Selene’s EXCore and becomes part of the same calibrated system. The same DSP that linearizes Selene applies the crossover and time alignment for Poseidon. There is no separate bass management to configure. No phase to align manually. The work it takes to add a subwoofer to most systems doesn’t exist here.

Add Poseidon and the system reaches 50Hz linear, F6 at 35Hz. Full-range monitoring from a system that fits on a desk and doesn’t require a dedicated acoustician to integrate.

Terminology

Don't call it a subwoofer.

A subwoofer like Gravity is a standalone enclosure you can place independently in the room, with volume, delay, and mute you set separately, even though the crossover itself runs off the same shared DSP as the mains. Poseidon doesn't work that way. It's intended to sit next to Selene, or stack with it using the stack joiner, and it has no independent control of any kind, no separate volume, delay, mute, or crossover. It's governed entirely as part of one calibrated three-way loudspeaker, not as a second speaker you're coordinating.
Driver Technology

More excursion than drivers twice its size.

The custom Epique MMAG 15cm (5.5") driver was engineered for this application specifically. 14.7mm of linear excursion in each direction. More throw than the 9-inch drivers in our previous generation Pulsars, from a driver that fits in a 6.5-inch cube. 98dB continuous at 50Hz. The output capability is not what you’d expect from something this small, because the driver wasn’t designed to meet a size spec. It was designed to meet an accuracy spec. When you hear bass on Poseidon, it’s what’s in the session. Not the driver, not the box, not the crossover artifact. The session.
System Integration

It was always part of the design.

Poseidon is powered by Selene’s EXCore and calibrated by the same DSP. Every Poseidon pair is measured individually, and the complete Selene + Poseidon system runs a coordinated calibration as a unit. The EXCore applies digital crossovers and time alignment to all drivers simultaneously. The system operates as a unified 3-way, not two components sharing a room. Poseidon has no independent controls in Houston, the whole system is adjusted together. Because Poseidon shares Selene’s DSP, over-the-air calibration updates extend to the complete system. Your Selene + Poseidon gets better as we get better.
Performance Measurements

We publish everything.
Make of it what you will.

Every Poseidon is measured and calibrated before it ships.

Poseidon RMS
Poseidon RMS
Poseidon THD
Poseidon THD
Poseidon Phase
Poseidon Phase
Full Specifications

Every number,
verified.

Performance (integrated with Selene)
System Frequency Response ±1.5dB, 50Hz–30kHz (linear to 50Hz)
System Low Freq. Extension F6 at 35Hz
Poseidon Continuous SPL @ 50Hz 98dB per driver
System Max SPL @ 1m 106dB @ 1kHz
Integration Crossover 150Hz zero-phase LR4 digital
Driver
Bass Extension Driver 15cm (5.5”) Epique MMAG, custom spec
Linear Excursion (Xmax) 14.7mm each direction
Amplification
Amplifier Hypex NCx252MP per driver, via Selene EXCore
Physical
Dimensions 165mm H × 160mm D × 165mm W (6.5” cube)
Weight 6.4kg (14 lbs) per cabinet
Mounting 100×100 or 75×75 MIS-D VESA, M4 fasteners
Baffles 12mm solid aluminum, front and rear
Compatibility Designed exclusively for Selene, requires Selene EXCore for operation
Warranty 6 years
Shipping Dimensions 508mm H × 508mm D × 457mm W (20” × 20” × 18”)
Shipping Weight 14.5kg (32 lbs)
The Complete System

Selene + Poseidon.
Point source. Full range.

Selene coaxial monitor
Complete System
Selene + Poseidon
Six inches. And then some.

Selene is a true point source from 150Hz to 30kHz. Poseidon takes it down to 50Hz linear. Full-range accuracy from a system that fits anywhere. The low end you hear is the low end that’s there.

View the system →
Get Poseidon

Your next great project
starts here.

Precision. Not Prestige.
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