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EP4 Sonic Defenders® Plus

Filtered Flanged Earplugs

EP4 Sonic Defenders Plus hearing protection -- Black

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Noise Reduction Rating 24dB (with filter caps inserted)
Color Black, Clear, Orange
Size S, M, L
Filter Yes
Stem Triple Flanged
Radio Comm Compatible Yes
Included Lanyards Detachable
Features Fits larger ear canals


EP4-BK-LPR-BULK 084871314985
EP4-BK-MPR 084871315197
EP4-BK-MPR-BULK 084871314978
EP4-BK-SPR 084871315180
EP4-BK-SPR-BULK 084871314961
EP4-LPR 084871311434
EP4-LPR-BULK 084871311519
EP4-MPR 084871311526
EP4-MPR-BULK 084871311533
EP4-SPR 084871315128
EP4-SPR-BULK 084871314992
EP4-BK-LPR 084871315203
EP4-OR-MPR 084871318884

For detailed specifications, click here.

EP4 Sonic Defenders® Plus protect your hearing without interfering with your ability to hear routine sounds or conversations. Their triple-flanged stem design fits larger ear canals and provides a Noise Reduction Rating (NRR) of 24dB. Sounds, at safe levels, are allowed to pass through into the ear canal, while potentially harmful noises (above 85dB) are reduced via a proprietary design that incorporates a special noise-reducing filter. EP4s include attached filter caps, which can be inserted for additional protection and blocking out lower-level noise, like that heard on a plane, where hearing ambient sounds or conversations isn't critical. Right/left color-coded Sonic Defenders Plus are made from a soft but durable, hypoallergenic polymer that provides all-day comfort and an extended product life (up to 6+ months, depending on usage and care). Their patented EarLock® retention rings lock the earplugs in place, while soft, adjustable triple-flanged stems provide secure seals in the ear canals. A low-profile design means EP4s can be worn while wearing a helmet or mask, or while using a phone or headset. Available in clear, black, or orange.

Comfortable EP4 Sonic Defenders Plus also serve as earpieces for compatible radio communication systems* simply by removing the noise-reducing filter and attaching the earpiece to the system. NOTE: EP4 earpiece no longer provides hearing protection once the noise-reducing filter has been removed.

EP4s are available in small (S), medium (M), and large (L). Proper size is based on the dimensions of your ear's concha bowl. Size "medium" fits most people. For those with smaller (in diameter) ear canals, the two-flange stem of our EP3 Sonic Defenders may provide a better fit than the EP4's three-flange stem.

For best fit, click on the small Sizing Chart image at left.

EP4 Sonic Defenders Plus are sold as a single left/right set or in a box containing 25 sets. Each set is packaged in a convenient carry case and includes a polymer lanyard.

Ā  * RADIO COMM SYSTEM COMPATIBILITY: Thales: Covert Security Harness; Harris: Security Force Communication Set; Motorola: Surveillance Kits; Tactical Command Industries: Tactical Earpiece Products; Peltor: Lightweight Systems-Hearplug; Silynx: C4Ops Headset

  • 24dB Noise Reduction Rating (NRR) with filter caps inserted
  • Lowers potentially dangerous noise levels above 85dB
  • Hear safe sound levels (with filter caps out) as if you weren't wearing ear plugs
  • Patented EarLock® retention rings utilize seven contact points to lock earpieces in place and fit the same way every time; soft, triple-flanged stems provide secure seals and all-day comfort
  • Made from hypoallergenic, medical-grade polymer that's soft, durable, and long-lasting
  • Low-profile design allows you to keep them in place while wearing a mask, helmet, hat, or while using phone, headphones, or supplemental hearing muffs
  • Serve as earpieces for compatible* radio communication systems
  • Available in clear, black, or orange
  • 26" polymer lanyard included

Related Information

Parts and Accessories

No Hearing Protection Provided by EP4.

I measured my ear canals and ordered the recommended Medium according to my ear size, model EP4 (three flange).

After using with a shot gun it was apparent that the hearing protection was minimal. I tested these, and I was right they offer Practically No Hearing Protection (ie. <<15dB!!!), either with or without the removable ports blocked! This is after repeated installations and attempts to get a good seal.

Test your hearing protection here, to see if they offer at least 15dB:

These EP4 are not recommended. Maybe this is why no one this product in Western Canada. I feel sorry for the people that use these in the military/police, and think that they are getting the protection they need, unless this protection is actually tested after installation in a proper testing environment.

Reviewed by Frank (Posted on 10/6/14)

Won't stay in

I have tried to wear these on a couple occasions and they simply won't stay in my ears. When I repeatedly push them in they work very well. But they slip out constantly.

Reviewed by Michael (Posted on 9/4/14)

Ep4 at work.

I work for a train company doing high pressure brake air test so the danger of hearing loss is great. I also need to be able to hear people around me as well as cars coming in and out of the shop, so regular ear plugs don't always work. These take a little getting used to cause of the locking ring, but they work great. I can hear everything around me, but if someone's using some load equipment or a valve opens up, I'm not deafened or possibly getting hearing damage. I ordered two pairs, one for work and one for the shooting range, and again I'm impressed with the function. I've even got guys I work with that are using them now.

Reviewed by Todd Atkins (Posted on 8/19/14)

These are absolutely HORRIBLE for shooting

After seeing these at a local gun store I thought I would give them a try because I hate the big ear protection that I currently use when on the range. I put these in my ears (yes they were installed correctly), went into the range and got setup to shoot. I was on the very end stall with the nearest shooter 3 stalls down shooting an AR-15. After about 30 rounds through one of my guns and about the same from the AR, I had to leave the range because it was starting to become painful. I took the earplugs out and I could hardly hear a thing. I put my headset on and went back to range and all was good but when I left and was driving home I literally could not hear my radio at a normal level so I just turned it off. I am a little better this morning but not even close to 100% full hearing. I have already thrown these in the trash and I will tell everybody I know that shoots not to even consider these because they are complete junk. I just hope my hearing comes back very soon and that there is no permanent damage.

Reviewed by Shooter (Posted on 8/5/14)

EP4 Sonic Defeders Plus 3 Flange

I received the earplugs the day before I left for Nationals in Camp Perry, Ohio. They do take some time to put in but once in they work amazingly. I could hear others talking perfectly; while shooting I was never bothered by the rifle. These earplugs work especially well when you close the extra seal. Thank you for a cheap yet effective product. I am telling all my teammates about them.

Reviewed by Justin (Posted on 7/28/14)

EP4 Sonic Defenders Plus - Comfort and Effectivness

I recieved my EP4s a few weeks ago. I ride a motorcycle and needed earplugs that protected (from wind and road noise plus my loud pipes) and fit better than the general foam plugs I'd been using. I ordered both the medium and small version of the EP4s because I wasn't sure what size would fit best. I was always stuffing in the foam plugs so I was guessing I might have a smaller ear canal. What I found was the mediums were perfect and the small really looks like something a kid might use. The EP4s have worked really well so far. The medium size fits nicely in my ear and I don't notice them or get any aches while wearing them with a full face helmet, even after several hours of riding. These really improve my overall riding experience. My ears don't ring after long rides and I don't feel there has been any loss in safety from wearing them. I will continue wearing these and would order again as replacements are needed.

Reviewed by Superrust (Posted on 7/7/14)

another layer of protection

SureFire, thanks for the great job of providing these EP4 earplugs. They are just what I need to provide another layer of protection I found necessary when firing my new Remington 300 ultra mag. The typical ear muffs weren't quite adequate at times. The fit is excellent. Thanks for the quality products as usual.

Reviewed by Chris in Utah (Posted on 7/4/14)


I run over the ear style ear protection, but when shooting in closed environments often I double up for extra protection. These are perfect for this application because they are low profile and can be unplugged if necessary. Also good for running plugged if you need ear pro that is just a little lower profile. Best and highest quality options for the price at SureFire.

Reviewed by BCF (Posted on 7/3/14)

Low key, easy hearing protection.

I received them a week ago and used them a few times since then. I wore them while hog hunting, and the ability to let sound in (voices, etc) was much appreciated.

Yesterday, at the range (with shooters on my right and left) I plugged them to let no sound in, and they works as advertised.

This is a great product, and something I'd recommend to anyone. In fact, I have talked my dad and a couple friends into picking some up.

Reviewed by Mike Morgan (Posted on 6/25/14)

not for me

I use ear plugs all the time at work and bought these for shooting. Big mistake they did work at all about went deff and I know that they were in right they fit good and sung. a week later ears still ringing, I think they are not worth one red cent.

Reviewed by jpbstr (Posted on 6/14/14)