HFT
Tune Your Acoustics
Most people don’t realize it, but your room isn’t neutral. Everything in it—walls, furniture, windows—reacts to sound. And not in harmony. These objects ring back at the music out of time, out of tune, and out of phase. That’s what collapses your soundstage—not your gear.
Our High Frequency Transducers (HFTs) act as miniature acoustic processors to eliminate room distortion by generating real-time phase-locked energy that steps down through harmonic coupling into the range you can actually hear, restoring your music’s natural timing, spatial cues, and tonal clarity. About the size of a shirt button, HFT’s properly placed around the room and speakers are powerful enough to transform your listening room’s acoustics. They’re excited by the music itself—by sound pressure, electromagnetic energy, and RF—and they respond in real time, emitting phase-locked ultrasonic energy tuned to reinforce the music, not fight it. And by the time your walls and knickknacks start ringing out of tune, your brain is already two steps ahead—processing the next wave of sound, guided by HFTs that are locked in with the music and tuned to the phase structure of the soundstage itself.
HFT Standard
$299 / 5 pack
$499 / 10 pack
The original HFT’s will make up the bulk of your HFT acoustic treatment. Most rooms are recommend to start with 15-20 standard HFT’s. Your speakers and room will disappear as your soundstage expands into a realistic and holographic representation of the musical event with improved frequency response from top to bottom.
HFT 2.0
$299 / 5 pack
HFT 2.0’s are added to your room’s existing HFT installation to create warmth and musicality. A combination of standard HFTs, HFT 2.0 and HFT X will provide the most balanced results.
HFT X
$299 / 3 pack
HFT X’s are added to your existing HFT installation to add focus, resolution and air. A combination of standard HFTs, HFT 2.0 and HFT X will provide the most balanced results.
HFT Speaker Kit Mk II
$895 / 14 pack
Redesigned from the ground up for the first time in a decade, our new HFT Speaker Kit Mk II now include six types of precisely tuned HFTs (14 HFTs total) in asymmetric deployment. Not only will your speakers disappear; they will deliver a sonic presentation that is tonally accurate, with the spatial realism and emotional immediacy the music was meant to convey that goes beyond what we believed possible.
HFT Wide Angle
$399 / 3 pack
HFT Wide Angle’s are added sparingly to a room already treated with HFT’s. With a wider and more powerful dispersion pattern they dramatically increase your sense of immersion in the sound field while expanding the scale and dimension of your soundstage.
HFT Awards
How HFTs Work
HFTs aren’t passive—they’re excited by the same acoustic pressure, electromagnetic fields, and RF energy your system creates. But unlike the objects in your room that ring late, out of tune, and out of phase, HFTs are engineered to respond instantly and in alignment with the signal’s harmonic structure. That’s how they lock in—not by being programmed, but by being placed where they can synchronize with real energy in real time.
They’re analog. They don’t guess, they react—faster and more accurately than the room itself.
Why Conventional Treatments Fall Short
Now here’s the key: your room is also activated by the music. The walls, the furniture, the glass—all of it reacts to the same energy. But the room reacts slowly. Its resonances are chaotic, delayed, and unmusical. Unfortunately, traditional acoustic solutions—dampening rooms flat and adding diffusers—often fall short of the intended outcome. Overdamped rooms sound dead with no decay, while diffusers eliminate the live hall sense that great recordings capture. Concert venues never rely on dampening alone because it kills musical subtleties. The best venues stay somewhat live with complementary reverberations. If amphitheaters sounded like typical audiophile rooms—thousands of surfaces resonating out of tune mixed with deadening absorption—live music would be ruined. Random resonating objects actually increase noise as volume rises, creating a variable noise floor that prevents you from experiencing live music’s magic at home.
Room Acoustics
Before HFT Installation
When you place HFTs strategically—on the back wall, above the listening position, and across a tuned grid—you create a fast, phase-accurate feedback loop that overrides the room’s slower, confused responses. You’re not canceling the room. You’re outrunning it. And your brain follows the faster, cleaner signal every time.
Room Acoustics
With HFTs Installed
Think of each HFT like a harmonic relay. Where you place it determines which part of the soundstage it locks onto—because it responds locally to what’s happening in that section of the room. The result is a reinforcement network that mirrors the timing and structure of the music itself. You don’t hear the HFTs. You hear what they let through—the space, the depth, the life that was buried under your room’s distortion until now.
HFT
Room Treatment Placement Guide
Easy as 1, 2, 3
Step 1
Start with Standard HFTs
Step 2
Add HFT 2.0s for warmth
Step 3
Add HFT Xs for clarity and focus
Step 4
Add HFT Wide Angles for width and scale
HFT Speaker Kit Mk II
Speaker Kit Placement Guide
Each HFT in the HFT Speaker Kit Mk II is color coded on its back. Follow the color assignments below to understand optimal placements for your speakers.
Synergistic Research Acoustic Treatment
Compatibility Guide
HFT Reviews
The overall results were quite startling. When my wife walked into the listening room after the process was finally completed, she made one of those quick jaw dropping expressions and sat down without a word. Nothing more was said. She just wanted to listen to the music without interruption. I understood.
Images truly stabilized and were much more clearly defined—even on the most mediocre of recordings. There was considerably more air and immediacy around individual instruments and vocalists. The soundstage extended well beyond the outer edges of both speakers and seemed to reach beyond the front wall and all the way back into the listening position.
Robert Youman, August 2019
These HFTs surprised me the most – their effect on the room was immediately audible. With just a few in our system and we were beginning to hear the holistic changes in the room. We started with the speaker only sets of HFTs, one module per side at a time. Over the course of testing and tuning, we hear subtle shift and changes that end up accumulating to a significant change. The soundstage would grow bigger and provide more depth.
Siao Jer, June 2018
The HFT/FEQ combination serves to make your listening room canvas more pristine so that when your audio system paints the music on it, the end result is a lot more true to life. Needless to say, the Synergistic Research HFT/FEQ combination I used in this review is not going anywhere. They are now an integral part of my reference audio system.
Malcolm Gomes, June 2018 / Issue 97
The FEQ and HFTs has brought me closer to the music more than any product I have ever reviewed. Compared to my previous reference at nearly half the price and considering its size and how it’s applied within our family room (happy wife … happy life), the combination of FEQ and HFTsis my new reference.
Mike Girardi
Even though parts of the Atmosphere/ATM/UEF/HFT system may sound voodooish, these things work, making smaller rooms sound like larger ones and making big multiway speakers disappear in them like two-way mini-monitors.
Jonathan Valin, April 2018
The effect on our system was immediately obvious: A thin layer of hash that had been below my notice (Ain’t it always the way?) was removed, clarifying a system that I already thought was exceptional.
David W. Robinson, November 2014 / Issue 82