Fox 40 Sonik Blast CMG Whistle Review: Loud Enough?

Fox 40 Sonik Blast CMG Whistle (Neon Green)

Photos coming soon.

The short version

Buy it if

Referees and coaches in loud gyms, rinks or stadiums
Lifeguards and boaters who need a whistle that works wet
Hikers and anyone wanting a loud signal whistle with no moving parts

Skip it if

A softer, lower tone is preferred for routine whistle use
The whistle will be blown close to sensitive ears, such as young kids, often

What owners like

Very loud, useful for stopping play in tense moments or in noisy indoor pools
Easy to blow and keeps working when wet
Lifeguard retailers note steady satisfaction with build and reliability
Many referees carry it alongside a Classic and switch when a game heats up

Common complaints

High, shrill pitch that some officials compare to a train whistle and dislike
So loud it can leave the user and nearby players briefly ringing
A few find the grip less comfortable than other Fox 40 models
Takes some practice to control the tone

Based on Fox 40's product page and US shop, product pages from Marine Rescue, The Lifeguard Store and Dave's Sport Shop, and two RefChat referee forum threads..

Research scores

Performance 8.5 rated 120 dB and works wet, though the pitch is shrill for some

Durability 8.0 no pea or moving parts to jam or freeze

Comfort/portability 7.0 cushioned grip, but some find it less comfortable and it rings the ears

Value 8.0 low cost for a whistle officials and lifeguards rely on

Scored from the maker's specs and what owners report. Drew's own notes and photos will refine these.

Ownership

Times bought1

Price range$

Drew's hands-on notes for this product are on the way. Long-term updates will be added to this timeline.

What it does

A two chamber pealess plastic whistle rated by Fox 40 at 120 dB, with a soft cushioned mouth grip and a lanyard.

No pea, so nothing inside can freeze, jam or wear out
Fox 40 says it cannot be overblown; harder breath gives more volume without the sound breaking up
Soft mouth grip meant to protect teeth and keep the whistle in place
Self clearing chambers for pool and open water use
Rated 5 dB louder than the Fox 40 Classic CMG, per the maker's US shop

A good pick for referees, coaches, lifeguards and anyone who needs a whistle that cuts through crowd, wind or water noise, since it has no pea to jam or freeze. The trade-off is the pitch: it is louder and shriller than the Fox 40 Classic, which some officials find harsh for routine calls.

How it compares

Fox 40 Classic CMGBetter for everyday officiating if a lower, less shrill tone matters more than peak volume$

Fox 40 Sonik Blast CMG FingergripBetter for coaches who want the same whistle held on the fingers instead of in the mouth all the time$

Fox 40 Fuziun CMGBetter if a three chamber whistle mixing high and low tones is wanted to stand out from nearby fields$

Specs

Rated output: 120 dB, the loudest in the Fox 40 lineup per the maker's US shop
Design: 2 chamber pealess, no moving parts
Materials: ABS plastic body with a thermoplastic Cushioned Mouth Grip (CMG)
Water use: Chambers self clear when submerged
Range: Heard up to about a mile away, per Fox 40 and retailers
Color: Neon green (one of 19 colors and two tone options)
Lanyard options from Fox 40: None, breakaway neck, Smitty, wrist, P.T. System, or fingergrip version

Worth knowing

The maker and retailer pages read for this page include no hearing warning, but referees on RefChat report brief ear ringing at close range.

Questions

How loud is the Fox 40 Sonik Blast?

Fox 40 rates it at 120 dB, which it lists as the loudest whistle in its range.

What is the difference between the Fox 40 Sonik Blast and the Classic?

The Sonik Blast is rated 120 dB against 115 dB for the Classic CMG and has a higher, sharper pitch. Both are pealess.

Does the Sonik Blast work when wet?

Yes. Fox 40 says the chambers self clear when submerged, and it has no pea to stick.

What does CMG mean on a Fox 40 whistle?

Cushioned Mouth Grip, a soft thermoplastic layer over the mouthpiece meant to protect teeth and improve grip.

Sources

Researched 2026-10-02. We bought this product; our page is built from the maker's details and what owners report across reviews and forums. We never copy Amazon customer reviews.