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Amphion One18

Passive 2-way studio monitor for critical listening, with 6.5″ custom driver, titanium tweeter,  waveguide, and passive radiator


Special 12-Month No-Interest Financing.

SKU: AMPONE18 Categories: , Brand:


The Amphion One18 is a 6-1/2″, passive 2-way studio monitor for critical listening, with passive radiator, custom low-frequency driver, highly compliant titanium tweeter, and proprietary waveguide for accurate point-source monitoring

 A passive monitor for high-end, critical mixing chores, the Amphion One18 features a 6-1/2″ custom woofer and a highly compliant (fast-responding) titanium tweeter for superior transient response—key to providing the spatial cues for a dimensional soundstage and instrument localization. In short, the Amphion One18 gives you the feeling of “being there.” However, that’s only part of the story. Designed to offer professional mixers the natural, un-hyped sound they need to make critical mix decisions, the One18 also uses a high-density, proprietary Corian® waveguide that, along with a low-frequency crossover, creates a seamless join for the woofer and tweeter. The result is the achievement of point-source monitoring and a flat response across the audible spectrum. For the low end, the One18 features a passive radiator that eliminates the phase issues and turbulent port noise that interferes with the response of the drivers. With Amphion One18’s on your meter bridge or workstation, you can EQ your mix, not your speakers.

Amphion One18 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 joins enables 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 One18’s waveguide enables superior integration between LF and HF drivers across 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, tight  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 One18’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 One18 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 high-end monitors that enable audio professionals to focus on the mix, not the sound of the speaker.

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).

A purely natural sounding monitor with impeccable detail, dimensional soundstage, and a never-ending sweet spot, the Amphion One18 has captured the imagination of some of the recording industry’s most illustrious ears. For more information, call or chat online with your Westlake Pro sales consultant today.


Amphion One18 specifications:

  • Color: Black
  • Operating principle: 2-way, passive radiator
  • Tweeter: 1″ titanium
  • Mid / woofer: 6-1/2″ aluminum
  • Crossover point: 1.6kHz
  • Impedance: 8 ohm
  • Sensitivity: 85dB @ 2.83V/1m
  • Frequency response: 45Hz – 20kHz +/-3dB
  • Power recommendation: 30W – 150W
  • Measurements (h x w x d):        15″ x 7-1/2″ x 12″ (380 x 191 x 305 mm)
  • Weight: 26.45 lb. (12 kg)

Additional information

Weight 12 lbs
Dimensions 305 × 191 × 380 in