UltraSonic™ HB 550 / high performance ear muffs

UltraSonic™ high performance ear muffs

UltraSonic high performance ear muffs provide 29 dB NRR and have exceptional low frequency attenuation.
UltraSonic, HB-650 Optional storage bag, SGB-30

Elvex UltraSonic earmuff is our newest high performance earmuff with a Noise Reduction Rating of 29 dB. This earmuff has been designed to provide excellent full spectrum attenuation, as well as superb low frequency attenuation. Ultrasonic uses a fork style headband for even distribution of the pressure, and improved balance required for extra deep ear cups.

    29 dB NRR from certified US laboratory ANSI S3.19-1974
    34 dB SNR as tested by certified European laboratory to CE EN-352-1
    Superb full spectrum and low frequency attenuation
    Extra wide ear cushions for highest comfort
    Soft padded headband with low force
    Steel headband tolerates temperature extremes
    Solid construction
   You get the ultimate performance and comfort with this muff  

 UltraSonic, HB-550, folds up to minimize storage spece. UltraSonic Foldable, HB-550

Product Name Product Number Product Description
Ultrasonic Foldable HB-550 UltraSonic™ Foldable Muff, Wide Ear Cushions, Steel Headband, 10.5 oz./296g., Black/Black,SNR 34, NRR 27
Ultrasonic HB-650 UltraSonic™ Muff, Stainless Steel Headband, Wide Ear Cushions, 10.1oz./272g., Black/Black,CE, SNR 34, NRR 29
Universal Ear Muff Hygiene Kit HK-650 Hygiene Kit, for HB-650 and HB-550
Safety Glass Accessories SGB-30 Storage Microfiber Bag, with drawstring, for goggles or muffs
HB-650            UltraSonic high performance muff, 29 dB NRR, 34 dB SNR, 
HB-550            UltraSonic Foldable high performance muff, 27 dB NRR, 
HK-650            Hygiene kit, ear cushions and foam absorbers, 
SGB-30            Storage micro-fiber bag, fits all ear muffs, 

HB-650: ANSI S3-19-1974, Dr. Michael & Associates, State College, Pennsylvania, USA

Frequency, Hz 125 250 500 1000 2000 3150 4000 6300 8000 H M L NRR
Mean Attenuation, dB

 22.1

27.9

34.9

35.8

37.3

41.4

42.3

41.6

41.2

37 33 27 29
Std. Deviation

 2.9

2.8

3.4

2.0

2.5

2.7

2.8

3.1

3.7

HB-650: CE EN-352-1:2002, INSPEC International, Greater Manchester, United Kingdom.

Frequency, Hz 63 125 250 500 1000 2000 4000 8000 H M L SNR
Mean attenuation, dB 19.3 19.3 26.1 34.0 39.6 35.1 43.5 38.9 35 32 24 34
Std. Deviation 3.8 2.7 2.8 2.6 3.2 3.0 2.9 5.2
Protection 15.5 16.6 23.3 31.4 36.4 32.1 40.6 33.7

HB-650: AS/NZS 1270:2002, Testing by Dr. Michael & Associates, State College, Pennsylvania

Frequency, Hz 125 250 500 1000 2000 4000 8000 SLC(80)
Mean Attenuation, dB

21.4

26.7

35.6

35.6

31.4

42.8

42.1

31.8
Class 5
Std. Deviation

2.8

2.3

3.8

3.2

2.5

3.8

2.9

Mean – Std. Deviation 18.6 24.4 31.8 32.4 28.9 39.0 39.2


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