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Amphion BaseTwo25 Stereo Bass System  From Amphion

Elevate your monitors

Amphion Loudspeakers


"Experience the Difference"

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Manufacturer's Description from Amphion

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.


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.

Amphion Loudspeakers

About Manufacturer

Amphion Loudspeakers Ltd. was established in 1998. We design and build loudspeakers that are characterised by honest and accurate sound reproduction.

All products are handmade in Finland (and the Amphion amplifiers are assembled in Finland) to ensure enduring listening quality.



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
  • 127dB
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

Related Videos

Jacquire King on Amphion studio monitors in his mixing & sound editing setup | Amphion Loudspeakers

A more than 30-time Grammy nominated and multi-Grammy award-winning record producer, engineer and mixer Jacquire King has worked with artists including Kings of Leon, Buddy Guy, Norah Jones, Tom Waits, to name a few. King is an Amphion user and stopped by our booth at The NAMM Show 2019 to share a few words about his experience with Amphion's Two18 studio monitors and BaseOne25 system, as well as the small One12 studio monitors.