Stereo Bass System


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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.

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.

Modern flexibility

Variable crossover frequency and bass level attenuator allow the system to match the specific needs of various sound engineering tasks.

Simple setup

Always placed on the centre-line of the monitors. Fixed placement and wide adjustment possibilities lead into effortless performance in all rooms.

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.


Operating principle: One-way, passive radiator
Drivers: 2 x 10” aluminium woofers; 2 x 10” aluminium radiators
Crossover point: Active 4th-order, selectable @ 40, 60, 80, 100 Hz
Max SPL: 127dB
Frequency response: 20 – 100 Hz ±3dB35 Hz – 200 kHz +/-3dB (high pass)
Connection: 3.5 m long, terminated with 2-pole Neutrik Speakon connectors
Measurements: 958 x 360 x 386 mm
Weight: 2 x 32 kg / 2 x 70 lb

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
Efficiency: 230 V / 50 Hz – 700 W; 120 V / 60 Hz – 670 W; 100 V / 50 Hz – 460 W
Mains: 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
Measurements: 483 x 88 x 260 mm
Weight: 6 kg