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Amphion One25A Three-way Active Studio Monitor - Pair

3-way powered studio monitor featuring Amphion's advanced acoustic design, simple signal path, and high level resolution enhanced with the benefits of a active speaker design


Product Description

The Amphion One25A Three-way Active Studio Monitor is Amphion’s first active studio monitor delivering all of the benefits of active designs without any of the drawbacks. Featuring an innovative sealed dual cabinet, which separates the midrange from the hexagon-shaped bass enclosure, eliminating standing waves and improving clarity across all frequencies, the One25A delivers unparalleled clarity and naturalness.

Equipped with a 1" titanium tweeter, the One25A delivers shimmering highs up to 22 kHz. A dedicated 5" aluminum driver provides clear and focused midrange, while the 10" aluminum woofer delivers deep and powerful bass. The monitor also comes equipped with a powerful 700W bass amp and two 250W amps for the midrange driver and tweeter.

With plenty of amplifier headroom, an elegant active crossover, and a built-in protection limiter that’s only in the signal path when needed, the One25A offers the highest level of resolution for all your audio needs.

Whether you're a professional sound engineer, music producer, or home studio enthusiast, the Amphion One25A Three-way Active Studio Monitor is the perfect tool for achieving exceptional sound quality. Experience the natural and precise sound reproduction that Amphion is renowned for, and take your audio production to the next level.


  • Acoustic symmetry: The baffle around the midrange is acoustically symmetrical, leading to a smooth frequency curve and precise imaging. Amphion's proprietary 5th generation U/D/D (Uniformly Directive Diffusion) offers multiple advantages as it improves driver integration and speaker performance in a room.
  • Compact, yet full range: Amphion One25A is physically small enough to be placed on a large format console, but still powerful enough even in the largest control rooms. One25A is truly full-range (20Hz -3dB) and therefore highly suitable for all modern sound-making applications, be it music or movies.
  • Isolated independent bass and midrange chambers: Midrange driver and tweeter are located in their own isolated chamber, and therefore a woofer’s potential negative effects, such as pressure changes, can be minimized. This leads to the highest possible levels of midrange and treble resolution and transparency. Due to its special internal shape the creation standing waves are eliminated.
  • Cabinet resonance control: The enclosure of One25A utilizes the know-how from world-class instrument building, but in reverse manner. The resonance-control and energy-transfer of the rigid, sealed enclosure are optimized for nuance-rich bass frequencies, which words alone are not enough to explain, and only a sonic self-experience can deliver.
  • Short signal path: Active speakers typically suffer from a lack of resolution due to their complex signal paths. The active crossover of the One25A is very simple, leading to maximum transparency and performance. Just as the 2-way filters before, the 3-way filter remains simple and elegant, ensuring the highest level of transparency.
  • Long lifetime and serviceability: Instead of placing the amplifier inside the monitor where it interferes with the moving elements, the Amp packs are located outside the speakers to ensure maximum ventilation and lowest possible operating temperature. They are also easily removed and replaced to ensure easy serviceability in case of problems or updates in the far future.

Product Specifications

Condition New
Width 20.1 in
Depth 19.2 in
Height 12.4 in
Unit Weight 91 lb
Active or Passive Active
Monitor Application Mid-Field
Speaker Configuration Three-Way
Driver Sizes LF: 10" aluminum; MF: 5.25" aluminum; HF: 1" titanium
Number of Speakers Pair
Input Connectors Analog XLR
Amp Wattage LF: 700 W; MF: 205 W; HF: 205 W
Frequency Range 20 Hz - 20 kHz
Max. SPL 112 dB

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How do you rate this product?
I would like to thank VK for the wonderful sales assistance, service and prices. This was my first purchase with you and it won't be my last. I only wish I'd discovered you years ago!
Matthew R.
I had two Grammy wins this year - Ray LaMontagne & Carolina Chocolate Drops. Both made with help from Vintage King!
Ryan F.
In almost 20 years in Pro audio buying, never did I receive a unit so well packed and exactly as described. Works flawlessly. The whole process has been so smooth. I will never hesitate to do business with you guys in the future and will recommend you to everyone I know.
Martin C.
This was my first experience buying something from Vintage King (although I surf the "used" categories on the website frequently!), and, despite being on the other side of the world, I had absolutely no trouble and everything went very smoothly.
Phil T.
The speed of delivery exceeded my expectations! I was VERY pleased that my shipment arrived in time for a scheduled vocal tracking session. The packing insured that my order arrived safely. And the sales staff responded quickly to questions regarding the product.
James P.
Thank you so much! Vintage King has been so fair and easy to work with. I can't thank you enough. It feels good to trust such a hefty purchase to folks who are so helpful and knowledgeable. Vintage King is a sound designers dream store.
Noa L.
You guys have excellent customer service and I am excited about the next upgrade I complete on my fifth recording facility. I've been in the studio business for forty plus years. The salesman I worked with at Vintage King was the best of the best. You all rock!
Robby T.
I would recommend Vintage King to any one looking for top-class gear, unbeatable customer service and the best prices on the map!
Jake D.
My experience with Vintage King was excellent. The order was here fast considering it was out of stock. The sales person had SKB send it to me directly and I couldn't have been more pleased.
Michael D.
From the minute I placed my order I was kept well-informed through each step in your process. Even though I was buying a comparatively modest piece of gear, your attention to detail made me feel like I was purchasing a six-figure mixing desk.
Thomas W.
I am a new customer of yours. You guys provided me the absolute best deals in ordering all the equipment to power my brand new recording studio. Your customer service is amazing and i will always deal with you from here on out.
Rob M.
Thanks for your great service and getting this out today. You guys really are the Kings!
Alan B.
Better than expected! Truly impeccable service. Your team was professional, knowledgeable, provided speedy delivery above and beyond standard. Vintage King Audio is definitely my go to for all of my audio and information needs.
James O.