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The Amphion BaseOne25 System features 2 subwoofer towers and 1 BaseAmp500 amplifier/crossover

The ultimate monitoring solution
The Amphion BaseOne25 bass extension system offers a complete solution to seamlessly transform studio monitors into a true stereo full-range monitoring system. The BaseOne25 extends all the way down to 20Hz while simultaneously improving dynamic range and minimizing distortion by handling most of the heavy-lifting at the low end of the sound spectrum.

The BaseOne25 is designed to pair with either One18 or Two18 studio monitors, depending on your needs, room size and its acoustics. The bass extension is a perfect fit to a mixing or mastering studio, or even to a music-composing setup.

Driven by Amphion's meticulously developed BaseAmp500 crossover/amplifier module, the BaseOne25 LF extension towers sit directly under the existing studio monitors. This makes physical integration and phase/time alignment much easier to achieve. Full range/monitor only -views into your music are available at the touch of a button (or a foot switch).

The result is a breathtaking 3D soundscape so accurate that you'll swear the musicians are playing right in front of you ... even with your eyes open!

Base systems
Seamless low-end extension
Balanced, clean and natural bass reproduction systems to complete a full range monitoring rig going all the way down to 10 hz.

Our base extention monitoring systems respond the most specific sound quality demands a producer, artist or studio engineer has. They seamlessly transform studio monitors to a true stereo full-range setup. Amphion monitoring systems provide exquisite detail and breathtaking 3D soundscape.


  • Built-in Crossover
  • Bass level control (below 100Hz)
  • Bypass switch and indicator
  • Bypass latching input footswitch

  • BaseOne25:
  • 10" aluminum long throw subwoofer with 10' aluminum passive radiator.
  • 40" tall, 35mm birch plywood cabinet
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