Amphion FlexBase25
Best low-end extension for professional studio mixing and mastering engineers.
The Amphion FlexBase25 is a powerful stereo bass system designed to elevate your studio monitors into a full-range, three-way setup. This integrated system seamlessly extends the low end of your existing Amphion monitors, adding detailed bass power without compromising their signature sound. It offers flexible controls for crossover frequency and stereo width, enhancing midrange clarity by managing demanding low frequencies. Ideal for high-end mixing and mastering, the FlexBase25 provides a complete low-end extension solution in a single, elegant unit.
$6500.00
Owner Satisfaction
4.7
/ 5
Category Rank
10
/ 118
#10 in Loudspeaker Management Systems
Price vs Category Average
+81%
Above average
Operating principle
One way closed box, stereo
/ One way closed box, stereo
Who it's for
- Engineers working in acoustically challenging studio spaces
- Amphion monitor owners seeking a cohesive full-range experience
- Professional mixers and mastering engineers requiring high-fidelity low-end
Who should skip it
- Budget-conscious producers avoiding additional amplifier and crossover costs
- Users preferring a simple plug-and-play active subwoofer setup
- Studio owners with limited floor space for large enclosures
Performance breakdown
Low-end extension
Delivers authoritative, full-range depth that transforms standard monitors into mastering-grade systems.
Midrange clarity
Offloading bass frequencies significantly cleans up the critical midrange for better imaging.
Integration precision
Seamlessly blends with Amphion monitors to maintain a cohesive, signature sonic character.
Stereo control
Adjustable width settings provide essential flexibility for modern mixing and mastering workflows.
Output headroom
Massive 1200-watt power ensures distortion-free performance even at demanding studio volumes.
Build integrity
Robust, heavy-duty construction minimizes cabinet resonance for tight, accurate bass reproduction.
Key Specs
Operating principle
One way closed box, stereo
Drivers
2 x 25 cm / 10" aluminium
Crossover
Active 4th-order @ 35-260 Hz
Frequency response
20 Hz – 260 Hz +/-3dB (low pass)
Max SPL
117dB
Dimensions
854 x 340 x 320 mm (33.62" x 13.39" x 12.6")
Weight
45 kg (99.2 lbs)
Connectivity
4-pole Neutrik Speakon connectors
Features
- Complete low-end extension system
- Seamless integration with Amphion monitors
- Flexible crossover frequency adjustment
- Adjustable stereo width control
- Improves midrange clarity
- Forms basis for high-end mastering
- Stereo bass system in one box
What customers say
Professionals highly value the Amphion FlexBase25 for its seamless integration as a phase coherent bass extension. Users emphasize that it avoids a typical subwoofer sound, instead delivering a natural, articulate, and fast low-frequency foundation that perfectly matches the main monitors. This system significantly improves mix translation by revealing crucial low-end details previously masked. Its robust build quality and adjustable crossover are noted strengths. While the premium price limits accessibility for some, those investing find the exceptional sonic accuracy and reliability make it a highly recommended upgrade for critical listening environments where precision is essential.
Know before you buy
While the FlexBase25 is optimized for the Amphion ecosystem, it is a versatile stereo bass system that can technically be integrated with other high-end monitors. However, you will achieve the most seamless phase alignment and sonic integration when paired with Amphion’s own monitor line.
The adjustable stereo width control allows you to manage the spatial image of your low frequencies. By narrowing or widening the bass, you can better control how your low-end sits in the mix, which helps improve overall midrange clarity and prevents the 'muddy' sound often caused by omnidirectional sub-bass.
No, the FlexBase25 features a built-in 1200-watt amplifier. It is a self-contained, active system designed to handle the heavy lifting of low-frequency reproduction, allowing your main monitors to focus on the midrange and high frequencies.
The 4th-order active crossover provides a steep, precise slope that ensures a clean hand-off between your main monitors and the FlexBase25. This minimizes frequency overlap, reducing distortion and ensuring that your monitors aren't struggling to reproduce frequencies they weren't designed to handle.
The FlexBase25 is a powerful unit, but its closed-box design offers tight, controlled bass response that is generally easier to manage in treated rooms than ported subwoofers. Because it is a stereo system, it provides a more accurate representation of the low-end image, which is beneficial for critical listening in professional spaces of various sizes.
The unit uses XLR inputs for your audio signal and 4-pole Neutrik Speakon connectors for robust, reliable connectivity. It is designed to sit at the base of your monitor setup, acting as a pedestal or a standalone unit that integrates directly into your signal chain.
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$6500