/ Studio products / BaseTwo25


Elevate your monitors

BaseTwo25 is a state-of-the-art monitoring solution elevating a two-way studio monitor into a fullrange, three-way system. The system is driven by BaseAmp1200, which houses Amphion’s discrete filtering module with a 4-step crossover selection, bypass and variable-level attenuator.

per system
Estimated retail price. Prices may vary due to local taxes, shipping, and other additional costs.

Unique highlights

Stereo to the lowest octave

Amphion’s introduced their first Base Extension system in 2015. The concept of keeping stereo information all the way down has become widely adopted since.

Seamless integration

Designed to work seamlessly with all monitor sizes. System can even be paired with a smaller model for an ultra-fast, easy to adjust small room full-range system.

Elevate your monitors

As the bass frequencies are transferred to the Base system, the midrange clarity and power-handling of the paired monitors are greatly enhanced.

Industry-defining clarity

Force-cancelling driver configuration and highest quality components lead into industry-defining clarity, control, and low frequency detail.

Simple setup

Always placed under the monitors. Fixed placement and physical proximity between the monitor and bass extender ensure perfect integration.

2-way, 3-way or Amphion way?

Simplicity of a 2-way monitor or the power handling of a 3-way design? The system can easily switch between both with a push of a button or foot switch.

Henkka Niemisto Brings Impact and Emotion to Immersive Audio Projects with Amphion

Henkka Niemistö – Mastering engineer

News & Reviews


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Operating principle

One-way, passive radiator


2 x 10” aluminium woofers
2 x 10” aluminium radiators

Crossover point

Active 4th-order, selectable @ 40, 60, 80, 100 Hz



Frequency response

20 – 100 Hz ±3dB35 Hz – 200 kHz +/-3dB (high pass)


3.5 m long, terminated with 2-pole Neutrik Speakon connectors


958 x 360 x 386 mm


2 x 32 kg / 2 x 70 lb

Handmade in Finland


Output power

1 % THD+N, 20 Hz – 20 kHz 700 W (4 Ω) per channel

THD+ noise

@ 10W: 0,0025% (100 Hz)
@ 100W: 0,0015% (100 Hz)

Dynamic range

127 dB (A) weighted


230 V / 50 Hz – 700 W
120 V / 60 Hz – 670 W
100 V / 50 Hz – 460 W


Universal mains including Power Factor Correction (100 – 240 V, 50 – 60 Hz)35 Hz – 200 kHz +/-3dB (high pass)

Stand-by mode

ErP (1275/2008/EC), Energy Star® v3.0 compliant


483 x 88 x 260 mm


6 kg / 13 lb

Assembled in Finland

Support materials

Which speaker to choose?

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Honesty in all sizes