Accessory Review: Sordin's Supreme Pro-X SFA Slim
- May 14
- 6 min read
Hearing protection is one of those categories where most shooters settle. They grab whatever electronic muffs are on sale, accept the tinny audio reproduction and the aggressive cutoff that makes every gunshot sound like a door slamming inside a tin can, and call it good enough. The Sordin Supreme Pro-X SFA Slim exists for the shooter who has decided that good enough is not, in fact, good enough. Built in Sweden by a company that has been engineering hearing protection since the late 1970s, this is what happens when decades of military-grade audio technology trickle down into a product designed specifically for hunters and competitive shooters who spend serious time behind the gun.
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The Company
Sordin's story starts in the Swedish forestry industry. In the mid-1970s, the shift to mechanized limbing created a need for serious hearing protection, and the founders of what would become Sordin answered it. The brand officially launched in 1987, delivering its first passive hearing protectors to Husqvarna, a partnership that continues to this day. By 1995, Sordin had introduced its first electronic models, manufactured at a dedicated electronics facility in Värnamo, in southern Sweden. The company spent time under the umbrella of MSA Safety, returned to Swedish ownership in 2018, and acquired Italian in-ear specialist Shothunt in 2022. Today, roughly 100 employees produce around 150,000 Supreme models per year, split between the civilian market and professional military and law enforcement users across the globe.
Nearly every component in a Sordin headset is sourced from Sweden or within the EU. The circuit boards are designed in-house and manufactured by a European supplier. This is not a brand that stamps its name on imported electronics. It is a manufacturer in the truest sense of the word.
What Makes the Pro-X SFA Slim Different
The Supreme Pro-X sits at the top of Sordin's civilian lineup, and the SFA Slim variant layers several specific features on top of that already capable platform.
Start with the SFA designation, which stands for Sordin Flexible Attenuation. The standard Supreme Pro-X provides an SNR rating of 27 dB. The SFA version ships with an additional distance ring and attenuation foam liner that snap onto the cups, increasing passive protection to SNR 31 dB. Both components are removable, which means you can configure the headset for two distinct noise environments. Running a 9mm carbine at an indoor range? Leave the distance ring installed. Sitting in a deer stand on a quiet morning where you want maximum ambient awareness with minimal bulk? Remove it. The ability to switch between attenuation levels without buying two separate headsets is a practical advantage that sounds simple but solves a real problem.
The Slim designation refers to the headband profile. This version wears a green PVC headband that is wider than Sordin's standard offerings, designed specifically for larger head shapes and for compatibility under ballistic helmets. The slim profile sits lower and flatter, reducing the interference that traditional headbands create when worn with headgear. The cups attach to the headband via wire brackets with hinged arms, and the length is adjustable. For shooters who want to transition to helmet-mounted use, optional ARC rail adapters are available, though the PVC headband cover must be opened to access the internal connecting cable between the cups.
The HEAR2 Sound System
This is where Sordin separates itself from the pack. The HEAR2 is Sordin's latest generation audio system, and it powers the Pro-X line with a level of sound reproduction that most electronic hearing protection cannot approach. Ambient sound is captured by external microphones on each cup and reproduced through internal speakers in real time. Hazardous impulse noise is compressed instantaneously, while safe ambient sounds, including voices, range commands, wind, footsteps, and animal movement, pass through naturally. The amplified output is capped at 82 dB, so you are never at risk of the electronics creating a noise hazard of their own.
What makes HEAR2 genuinely useful rather than just technically capable are the four audio profiles, each tuned for a specific use case.
Hunting is the default profile, with gain and frequency response set to mimic natural ambient sound. It provides a balanced listening experience with solid situational awareness and comfortable volume across a broad spectrum. This is the mode you leave it on when you are walking a field edge or glassing a hillside.
Focus increases the gain and widens the frequency spectrum significantly. This is designed for the hunter sitting in a stand or a blind, waiting for the sound of movement in brush, a twig snap, or hooves on frozen ground. It amplifies faint sounds that the Hunting profile would not pick up, giving you an auditory advantage that borders on unfair.
Shooting reduces the gain and narrows the frequency band. On a range, you do not need to hear every conversation happening three bays down. You need to hear range commands and the person next to you, and nothing else. This profile strips away the unnecessary ambient noise and provides a clean, comfortable listening environment for sustained shooting sessions.
Comms is the fourth profile, designed for use with the 3.5mm auxiliary input jack on the left cup. Plug in a radio, a phone, or a communication device, and this profile optimizes the audio balance between the external input and the ambient microphone feed. For hunters coordinating a drive or shooters receiving stage briefings through a radio, this keeps both channels clear without one drowning the other.
Switching between profiles is handled by the three push buttons on the left cup, which also control power and volume. Different beep patterns confirm which profile is active. Sordin includes a credit-card-sized quick guide with the headset, which is a thoughtful touch for users who do not operate the muffs frequently enough to memorize the button sequences.
Build and Comfort
The Pro-X SFA Slim weighs approximately 347 grams (just over 12 ounces) with the distance ring installed. The cups are compact relative to the attenuation they provide, and the design has been shaped to minimize interference with rifle stocks during the cheek weld. This is a detail that Sordin has prioritized across the Supreme line, and it is one of the reasons the brand has built such a loyal following among hunters who shoulder a rifle hundreds of times a season. Standard sealing rings are PVC foam, with gel ring upgrades available as an accessory for shooters who prefer a softer seal or who wear glasses. The entire unit is IP67 rated, meaning the microphones and battery compartment are fully waterproof and dustproof. Power comes from two AAA batteries.
Who This Is For
The Sordin Supreme Pro-X SFA Slim is for the shooter or hunter who has tried cheaper electronic hearing protection and knows what is missing. It is for the competitive shooter who wants to hear range commands clearly without being startled by the compression artifacts that lesser electronics produce. It is for the hunter who sits in a stand before dawn and wants to hear the woods wake up around them, then walk to a range in the afternoon and switch profiles without switching headsets. And it is for anyone who has realized that hearing protection is not just safety equipment. It is part of the shooting experience, and the quality of what you hear directly affects how you perform and how much you enjoy your time behind the gun.
Final Thoughts
Sordin has been building hearing protection for nearly five decades, and the Supreme Pro-X SFA Slim represents the full accumulation of that experience. The Flexible Attenuation system gives you two protection levels in one headset. The HEAR2 sound system delivers audio reproduction that makes the world outside the cups sound like the world actually sounds. The Slim headband fits comfortably on wider heads and transitions to helmet mounting when needed. And the entire package is built in Sweden by a company that supplies the same core technology to military end users who depend on it in environments where hearing clearly is not a luxury but a survival requirement. If you have been treating hearing protection as an afterthought, the Pro-X SFA Slim will change your mind. And once it does, you will not go back.
SHOP SORDIN
Shop the Supreme Pro-X SFA Slim at Somarriba!
