HELMET AUDIO
XSound 4 Helmet Speakers
REFERENCE SERIES
Sound that lives inside your helmet.
The IASUS XSound 4 is a premium helmet speaker system engineered for high-definition audio in motorcycle and other compatible helmets. Featuring Acoustic Flex technology, a precision-machined aluminum housing, and a 45mm full-range driver, the XSound 4 is designed to deliver detailed sound with improved speaker positioning and comfort.
- Acoustic Flex covers mold to your ear and keep the driver seated
- True hi-def audio, tuned in house for music and comms at speed
- Compatible with a wide range of helmets and audio systems, with 3.5mm and USB-C connectivity options.
SINCE 2001 · DESIGNED IN HOUSE · ACOUSTIC FLEX TECHNOLOGY
THE TECHNOLOGY
Engineering that lives inside the helmet.
XSound 4 is built around one idea: the driver has to stay exactly where it sounds best, under the pressure of a real helmet. Every component, from the Acoustic Flex cover to the aluminum chassis and reinforced cable, is designed around that principle.
1. CNC aluminum chassis
Precision machined housing that holds its tuning and its shape. Matte black finish with bronze highlights.
2. Acoustic Flex (AF) cover
Ultra-thin, soft, translucent cover that molds to the shape of your ear and keeps the driver seated and sealed, even when the helmet shifts.
3. 45mm hi-def driver
Full-range driver tuned in house for the enclosed acoustics of a helmet. Deep, controlled bass with clear mid and high response at speed.
4. 3.5mm connector
Corrosion resistant connection to any audio source. 64 Ohm ±15% impedance, 30 mW max power.
5. Kevlar reinforced cable
Custom length left 40cm / right 20cm, reinforced so it survives thousands of helmet on-offs.
ACOUSTIC FLEX TECHNOLOGY
The cover does the work.
Acoustic Flex is IASUS’s flexible speaker-cover technology, designed to improve how helmet speakers sit against the ears. By adapting to the contours of the ear, the covers help maintain speaker contact and positioning inside the helmet.
- Helps improve speaker-to-ear positioning.
Designed to adapt to different ear contours. - Supports comfortable speaker contact inside the helmet.
- Helps maintain a consistent listening position during rides.
01
Mold
The soft cover conforms to the contours of your ear, helping the speaker maintain direct contact instead of sitting too far away in the helmet’s speaker pocket.
02
Seal
Direct contact between the speaker and ear helps reduce the gap through which sound can escape, supporting a more consistent listening experience.
03
Hold
When the helmet shifts, the flexible cover helps the speaker maintain contact with the ear, supporting more consistent positioning and bass response.
HELMET SPEAKERS ENGINEERED FOR FULL-RANGE AUDIO
Sound you can feel, tuned for world inside your helmet.
A helmet creates a different acoustic environment from a conventional listening space. The IASUS XSound 4 features a 45 mm full-range driver tuned in-house for helmet audio applications.
Designed for:
- Music: Full-range sound with a focus on bass response and high-frequency clarity.
- Navigation: Clear audio for compatible GPS and navigation systems.
- Communications: Voice audio through compatible helmet communication systems.
- Riding Applications: Audio performance designed for the enclosed environment of a helmet.
Actual listening performance depends on speaker positioning, helmet fit, audio-source output, and surrounding noise.
WHERE YOU RIDE IT
Built for the places you push it.
One speaker system, tuned for the extremes. Built for motorcycle helmets, snow helmets, touring, commuting and every mile in between, so the canyon, the track, the trail and the deep snow stay outside the helmet.
01
SPORTBIKE
Lean it in. The soundtrack holds.
02
DUAL-SPORT
Dust, rocks, throttle pinned.
03
SNOWMOBILE
Powder and cold. The music stays clear.
04
TRACK DAY
Every lap, every cue, first time.
XSound 4 Reference Series
Tuned for the BMH, REKON, BMT and STEALTH. Ready for any helmet.
$159
THE BRAND
We only do one thing: audio inside the helmet.
IASUS Concepts has designed helmet audio systems since 2001. From speakers and communication systems to microphones and amplification, every product is built around one environment: inside the helmet.
WHY MOST HELMET AUDIO FAILS
Your helmet has speaker pockets. Your ears are somewhere else.
Traditional helmet speakers shift, sit too far from the ear, or create pressure points. The gap is small, but it is enough. Wind and engine noise pour in, the music turns to noise, and you reach for the volume. XSound 4 starts with the part that actually matters: where the driver sits.
TRUE HI-DEF AUDIO
Wide bass, thin profile, clarity at speed.
IASUS pioneered true hi-definition helmet speakers, and the XSound 4 continues that legacy. Tuned for the enclosed acoustics of a helmet, and engineered for music, calls and navigation.
Music
Wide bass range that rivals full sized speakers, with high definition clarity across all frequencies.
Comms
Rider to rider and calls, heard the first time. Optimized for the IASUS comm and throat mic systems.
Navigation
Turn prompts land before the corner, not after it. Exceptionally thin profile for helmet comfort.
FEATURES AT A GLANCE
What you are getting.
- True hi-def audio
- Optimized for IASUS REKON
- Acoustically tuned CNC chassis
- Custom Kevlar reinforced wires
- AF cover technology, minimal audio loss
- Black finish with matte bronze highlights
- 3.5mm audio out
- USB-C audio cable for smartphones
- Ear Unfolding Tab for comfort
INSTALL AND POSITIONING
If it sounds bad, it is not the speakers.
For best results the speakers should sit flush, aligned with your ear canal. If there is a gap, you will be tempted to add volume, and that is where audio is lost and distortion creeps in.
Each XSound 4 package includes the Ear Unfolding Tab, a custom ear positioning tool. If your ear folds during helmet entry, it lets you gently unfold the ear inside the helmet, for perfect alignment, more comfort, a better acoustic seal and stronger bass.
UNIVERSAL COMPATIBILITY
One system, every lid you own.
The IASUS XSound 4 is a wired helmet speaker system designed to work with compatible audio sources and helmet communication systems.
Helmet Compatibility
- Motorcycle helmets with suitable speaker pockets and sufficient space for installation.
- Full-face, modular, and other compatible helmet styles, depending on their internal layout.
Audio Connectivity
- 3.5mm audio connection: For compatible audio devices and communication systems with a standard 3.5mm speaker output.
- Bluetooth helmet communication systems: Compatible with systems that support wired external speakers through a 3.5mm connection.
- Other audio sources: May require a suitable adapter, depending on the device’s output and connection type.
Works With Your Existing Gear
- Use with compatible helmet communication systems from brands such as Sena and Cardo.
- Connect to compatible audio amplifiers for additional driving power when needed.
- Pair with your preferred navigation or communication setup through a compatible audio source.
Before You Buy: Check your helmet’s speaker pocket dimensions, connector type, and communication system specifications to confirm compatibility.
DEVICES
- All smartphones, via 3.5mm or USB-C extension cable
- All IASUS communication systems
- REKON and BMH helmet comm systems
- IASUS throat mics
- Any 3.5mm audio source
HELMET TYPES
- Full face
- Modular
- ADV and dual sport
- Snow and ski helmets
FULL-FACE
MODULAR / ADV
SNOW
E-SCOOTER
WHAT’S IN THE BOX
Everything needed comes included.
1 × XSound 4 Helmet Speaker Set
1 × Set of Acoustic Flex (AF) Ultra-Soft Covers (pre-installed)
2 × Foam Pad Spacers
2 × 3M Velcro Adhesive Mounts (hook and loop)
1 × USB-C to 3.5 mm Audio Extension Cable
1 × Ear Unfolding Tab with Keychain
Package contents may vary by country or region. Please refer to the contents included with your product.
SINCE 2001
Twenty years in the ear of the rider.
IASUS Concepts has designed and built helmet headsets since 2001. Our systems have been tested on MotoGP bikes and worn by riders across the world. Twenty years, and the goal has not changed: audio that holds up when the ride gets loud.
2001
FOUNDED
20+
YEARS IN HEADSETS
MotoGP
TESTED STEALTH COMMS ON TRACK
In house
DESIGN AND BUILD
TECHNICAL SPECIFICATIONS
The details. Full Specifications.
| Max power | 30 mW |
| Frequency range | 20 Hz – 20 kHz |
| Weight | 34 g (1.2 oz) |
| Housing | CNC aluminum chassis |
| Audio output | 3.5mm pin |
| Cable type | Kevlar reinforced |
| Right cable length | 20 cm |
| Impedance | 64 Ohm ±15% |
| Sensitivity | 125 dB |
| Driver size | 45 mm |
| Thickness | 0.99 cm (0.39 in) |
| Connector | Gold plated |
| Left cable length | 40 cm |
| HD audio | Full range hi-def |
COMPARE THE RANGE
Which XSound is right for you.
Three helmet speakers, one goal: sound that holds up inside a helmet. The XSound 4 is our flagship. The XSound 3 is the full-range upgrade. The XSound 2.1R is the loudest we have ever made.
| FEATURE | XSound 2.1R Loud with bass and treble | XSound 3 Full-range audio | XSound 4 Full-range audio, Flagship, AF cover |
| Price | $49.95 | $119 | $159 |
| Acoustic Flex Technology | No | No | Yes |
| Driver | 40 mm | 45 mm | 45mm |
| Housing | Stainless steel | CNC aluminum | CNC aluminum |
| Rated power | 30 mW | 20 mW | 20 mW |
| Max power | 40 mW | 30 mW | 30 mW |
| Impedance | 64 Ohm ±15% | 64 Ohm ±15% | 64 Ohm ±15% |
| Frequency range | 20 Hz – 20 kHz | 20 Hz – 20 kHz | 20 Hz – 20 kHz |
| Sensitivity | 125 ±3 dB | 127 ±3 dB | 127 ±3 dB |
| Weight | 36 g | 34 g | 34 g |
| Thickness | 10 mm | 9.9 mm | 9.9 mm |
| Cable | Kevlar reinforced | Kevlar reinforced | Kevlar reinforced |
| Best for | Max volume on a budget | Full-range audio experience | Flagship + Acoustic Flex Technology |
“`
PAIRS WITH
Build the full IASUS comms stack.
The XSound 4 is the speaker stage. Pair it with a comm system for the brain, a throat mic for your voice, and the amplifier for full headroom.
HEADSETS / COMM
THROAT MICS
FREQUENTLY ASKED QUESTIONS
Everything riders ask.
Do the XSound 4 speakers need to touch my ears?
Yes. For optimal performance, the speakers should sit flush against your ears inside the helmet.
Direct contact ensures:
- Maximum volume efficiency
- Strong bass response
- Minimal audio loss
- Reduced distortion
If there is a gap between the speaker and your ear, you may be tempted to increase volume excessively, which can damage the speakers over time.
Where should I position the speakers inside my helmet?
For best results, mount the speakers:
- Directly aligned with your ear canal
This positioning improves comfort and acoustic seal while preventing ear folding.
How can I test the optimal speaker position before installation?
Before mounting:
- Connect the speakers directly to your smartphone or music player using the 3.5 mm cable.
- Hold the speakers directly against your ears.
- Play music at your typical riding volume.
This allows you to benchmark the sound quality and determine the ideal positioning before installing them in your helmet.
Why does proper alignment matter so much?
Helmet acoustics are enclosed and highly sensitive to positioning. If the speaker shifts or your ear folds when putting on the helmet:
- Volume may decrease
- Bass response may weaken
- Sound clarity may suffer
The XSound 4 is engineered to perform at its best when properly aligned.
What is the Ear Unfolding Tab and how do I use it?
The Ear Unfolding Tab is included to help riders reposition their ears after putting on a tight-fitting helmet.
If your ear folds during helmet entry:
- Open your visor or access from the bottom opening
- Use the thin tab to gently reposition your ear
- Ensure the speaker sits flush against the ear surface
This small adjustment can dramatically improve sound quality and comfort.
Will the XSound 4 fit in tight helmets?
Most helmets accommodate the XSound 4’s. Before purchasing, consider whether your helmet has sufficient ear pocket space for added components.
Why do I hear crackling or distortion at higher volumes?
If distortion occurs:
- Connect the speakers directly to a smartphone or music player.
- Play audio at the same volume level.
If distortion disappears, your motorcycle headset or Bluetooth receiver is likely the limitation. Some stock communication systems do not support full output, especially when paired with high performance speakers like the XSound 4. In this case, reach out to us for more assistance.
Are the XSound 4 speakers compatible with all motorcycle headsets?
The XSound 4 is designed to replace stock helmet speakers and works with most systems that use a 3.5 mm output.
However, due to the wide variety of motorcycle headsets and Bluetooth receivers on the market, IASUS cannot guarantee compatibility with every model.
Are the XSound 4 speakers safe to use at maximum volume?
The XSound 4 is engineered to handle maximum output from smartphones and music players without distortion.
However, listening at excessive volume levels may cause temporary or permanent hearing damage. We strongly recommend using safe listening levels, especially during long rides.
Why might volume seem reduced after installing the speakers?
Reduced volume is typically caused by:
- A gap between the speaker and your ear
- Ear folding inside tight helmets
- Improper speaker alignment
Ensuring flush positioning restores full audio performance.
Do the XSound 4 speakers come with foam spacing pads?
Foam spacing pads are included with all XSound helmet speaker models to help achieve proper ear contact.
The XSound 4 uses upgraded Acoustic Flex (AF) Technology covers to naturally mold to the ear and maintain optimal positioning without traditional foam spacers.
What is the lifespan of the cables?
Due to global RoHS environmental compliance requirements, modern cable materials are biodegradable over time.
This means that, like most wired headsets (including major brands), the cable material may naturally break down after extended years of use. Proper storage and avoiding extreme environmental exposure can help extend lifespan.
How can I maximize the lifespan of my XSound 4 speakers?
- Avoid excessive volume levels
- Ensure proper ear alignment (no volume compensation needed)
- Store in a dry environment
- Avoid excessive pulling or tension on cables
The Kevlar-reinforced wiring is designed for durability, but responsible use ensures long-term performance.
Are the XSound 4 speakers optimized for the REKON system?
Yes. The XSound 4 is acoustically tuned to pair perfectly with the IASUS REKON LTE communication system, delivering enhanced clarity for music, navigation, and voice communication.
CUSTOMER REVIEWS
What riders say.
★★★★★
BIG IMPROVEMENT
Really impressed with the Acoustic Flex technology. It feels like these speakers were made for my ears. Super comfortable and the sound quality is amazing. Makes every ride that much better.
CHRIS A.
★★★★★
GREAT QUALITY
IASUS really takes helmet audio to another level. The Hi Def speakers sound great, and I can actually enjoy my music while riding. Definitely makes a big difference on the road.
JESSICA T.
★★★★★
A GAME CHANGER
The sound quality is incredible! The Acoustic Flex covers fit my ears so naturally, and the audio feels much more immersive than anything I’ve used before. Totally worth it.
MARK T.