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Amphion One15 Passive Monitor

Passive 2-way studio monitor with passive radiator for deep bass extension and proprietary waveguide for accurate point-source monitoring


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The Amphion One15 is a 5-1/4″, passive 2-way studio monitor with passive radiator for controlled bass, and a proprietary waveguide for accurate point-source monitoring, natural sound, and 3-D soundstage

 A monitor for the professional studio, the 5-1/4″ Amphion One15 has a deeper bass extension than its slightly smaller sibling, the One12. It features the same passive radiator design that prevents port noise from adversely affecting the frequency range, while providing a solid, controlled bass. Along with custom drivers, The Amphion One15 features a proprietary, high-density waveguide and low crossover frequency that creates a seamless transition across the audible spectrum. Completely hand-built to exacting tolerances, Amphion crafted the One15 to reproduce sound without adding any hype in its frequency range so that when you mix, you’re EQing the actual instruments, not the monitor. A purely natural sounding monitor with impeccable detail, dimensional soundstage, and a never-ending sweet spot, the Amphion One15 has captured the imagination of some of the recording industry’s most illustrious ears.

Amphion One15 passive studio monitor in one take:

  • Controlled dispersion via proprietary, high-density Corian® waveguide
  • Passive radiator for deep, controlled bass
  • Low-frequency crossover and high-precision driver integration
  • Handmade to exacting specification and tolerances

Controlled dispersion via proprietary, high-density waveguide

One of the problems plaguing two-way speaker design is phase coherency and linearity across the audible spectrum. The difficulties arise from combining the physical properties of the various drivers into a unified system. To accomplish this, Amphion’s proprietary Corian waveguide that seamlessly couples the tweeter and woofer, enabling phase-coherent, point-source monitoring. Created to last a lifetime, Corian is a non-porous, highly reflective material with a stone-hard surface that can be seamlessly crafted into any shape to accommodate any design or dimension. The One15’s waveguide enables superior integration between LF and HF drivers acorss a broad frequency range, which reduces the need for electrical time correction. The result is stunningly accurate sound reproduction that turns the chore of making critical mix decisions into a creative pleasure.

Passive radiator for deep controlled bass

Due to the unyielding laws of physics, the price for the convenience of a compact cabinet is simply not enough physical space for properly designed bass reflex ports. Front-panel ports can contribute noise and hype to the low frequencies up through the midrange, masking the true response of the drivers. The passive radiator offers an elegant solution. In essence, the radiator is a diaphragm or speaker that doubly serves to cover inconveniently large ports and increase bass response. Mounted on the rear of the One15’s sealed cabinet, the radiator vibrates in sympathy with the low-frequency driver, which maintains the same low-frequency response regardless of volume—hence the One15 providing exceptional tonal balance and sound stage at lower and more comfortable listening levels.

Low crossover frequency and high-precision driver integration

 In order to make proper assessments and mix accordingly, monitors, to paraphrase Quincy Jones, should tell the truth. In essence, you have to be able to hear what you recorded. As such, harsh tone, distortion, phase problems, uneven directivity, and unnecessarily high listening volume not only color the sound, but cause ear fatigue, which can often be related to lack of resolution and balance. Amphion’s low crossover frequency and high precision driver integration interact seamlessly to provide accurate phase response and a realistic sound stage. Perhaps the most important feature of Amphion monitors is their uncanny ability to reproduce sound without adding any sound of their own—the truth, the whole truth, and nothing but the truth.

Handmade in Finland

Amphion comprises a small, dedicated team of highly skilled craftsmen and technicians who are passionate about music and sound. All Amphion monitors and amplifiers are meticulously hand-built to impeccable standards, with high specs and tolerances. The result is a range of monitors that

Who’s using Amphion?

Among the growing list of mixers, engineers, sound editors, and composers taken with the Amphion sound, are pro audio luminaries such as Dave Pensado, Jacquire King, multiple Grammy winner Dave Reitzas, BAFTA award-winning composer, Jasper Kyd, and the legendary Bruce Swedien, engineer and mixer of the world’s best-selling album, Michael Jackson’s Thriller (which, by the way, was recorded right here at our very own Westlake Studios).

Fill that empty meter bridge with a pair of Amphion One15 passive monitors, and greatness will follow. For more information, call or chat online with your Westlake Pro sales consultant today.


Amphion One15 specifications:

  • Color: Black
  • Operating principle: 2-way, passive radiator
  • Tweeter: 1″ titanium
  • Mid / woofer: 5-1/4″ aluminum
  • Crossover point: 1.6kHz
  • Impedance: 8 ohm
  • Sensitivity: 84dB @ 2.83V/1m
  • Frequency response: 49Hz – 20kHz +/-3dB
  • Power recommendation: 20W – 100W
  • Measurements (h x w x d): 12-7/16″ x 6-9/32″ x 10-7/16 (316 x 160 x 265 mm)
  • Weight: 15.4 lb. (7 kg)

Additional information

Weight 7 lbs
Dimensions 265 × 160 × 316 in