FlexBase25 is a stereo bass-extension and management system with separate LFE-channel input and a 2 x 700W amplifier.

  • Variable crossover frequency allows changing the flavor of the system to match the specifics of the various production tasks.
  • Mono/stereo spread adjustment to ensure precise system-integration, even when higher crossover points are used.
  • Fast and simple-to-set-up, easily adapting to a large variety of projects and acoustic environments.


Total control for maximum impact.

Amphion’s FlexBase25 in a modern approach to subwoofer design. FlexBase25 is room friendly and equally suited for studio acoustics as well as less-treated home studio environments. It is easy to set up and intuitive to adjust. FlexBase25 is a single box, stereo base extension system, which is placed in the centre line between the main speakers.

Wide adjustment possibilities over crossover frequency (35-260 Hz), subwoofer level, as well as the mono-stereo spread, allow it to address the needs of a rapidly changing landscape of modern music-making. With a turn of a few dials, the system adapts to any task you happen to be working on. It can be fat, fun, and vibey when writing and producing. It will be precise, correct, and analytical when putting the finishing touches on a track or a film score.

FlexBase25 does not work like a conventional subwoofer. It does not only add, but it also transforms. FlexBase25 turns your 2-way monitor into a 3-way full-range system, which increases the monitor’s headroom radically. Pair it with One12 or One15 for an ultra-fast, easy to adjust small room full-range system. Place it behind your console and let it blend seamlessly with your One18, Two15 ore Two18 monitor, is located on a meter bridge. When you want to dial in on the midrange the by-pass function allows you to use your monitors for a narrower midrange view.

While FlexBase25 is naturally optimized for Amphion products, it blends well with other studio monitors as well.

See more on Amphion’s website.

Additional information
Operating principle

Two-way, passive radiators


1″ (25mm) titanium tweeter
4½” (120mm) aluminum woofer


6 kg (13 lbs)

Crossover point

1600 Hz


84 dB @ 2.83V/1m

Frequency response

78 – 20.000 Hz ±3dB

Power recommendation

20 – 100 W

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