I have Scala and the speakers are attached inside the helmet, primarily used for communication. I use 33db earplugs at the same time and I can hear my scala just fine, even on highway. If I feel like music, I'll replace the earplugs with earbuds to my iPod. (Skipping the bluetooth to really stretch out the battery of the scala for 2way chat).
Hear loss is permanent. Take every precaution to minimize the deterioration. On top of hearing loss, you feel less fatigue when you cut down the wind noise with ear plugs.
Yep exactly
they let you hear whats around you and hear your music clearly.
so do ear plugs and earphones...
bone conduction is crap - there is no detail.
Why is it so hard to get people to understand the physics of sound and the need for hearing protection.
Attenuation that reduces the sound levels does not block the sounds - it reduces them like turning down a radio volume.
The attenuation is what protects your hearing.
Your hearing clamps down itself at a certain level but cannot do indefinitely.
Anything over 90 db sustained will damage your hearing eventually.
The best helmets alone might get you down to 100 dB which government standards say 1 hour is max without damage but even that level is not at freeway speeds of 120 kph or so where it gets to 105+.
IN addition - helmets have the worst noise levels at the frequencies we need most - which is for speech.
Earphones get the attenuation down 23 to 28 dB on average and will protect your hearing and let you listen to music or nav aid at conversational levles.
Earplugs get it down even further -33 to totally relaxed levels, dB is logarithmic so even a small change can help or harm.
For instance 90 db is tolerable for 8 hours a day without damage but 92 dB only 6 hours and 100 dB for only 2 hours yet the very best helmets rarely get under 100 and the worst at 108....where even a half hour can do damage.
One extensive British study noted below had all helmets at 100 db at 70 mph regardless of design.
Sure if you are just going down to the local store you don't need hearing protection ( I don't either ).
Get on the highway even for 1/2 an hour and you do and the noise on the 400 at 120 kph is horrendous given the additional truck tire whine and buffetting.
Helmets - closed face in particular magnify certain frequencies as they are resonant....they are designed to protect your head not your hearing.
By choosing the attenuation level ( you can get earplugs that do so ) you choose your sound environment and protect your ears and you can still hear what's going on around you.
Good over view
http://www.ridermagazine.com/motorcycle-gear-buyers-guides/hearing-protection-for-motorcyclists.htm/
From this report - this for earplugs
The Bottom Line?
The best bet are foamies; cheap but very effective. Some vendors can provide convenient sampler packs, like
www.aerostich.com. Buy ’em all and try ’em all. Practice inserting them correctly. Find a pair that fit your particular ears well, and then buy ’em in bulk. For even greater protection, you may want to step up to the Etymotic Musician custom ear plugs. With their optional attenuation levels of 9, 15 and 25 dB and the comfort of the added custom ear mold, these are the true Gold Standard for attenuation. Comfy and effective.
I wear my 25s religiously now, and wish I had for the last 20 years.
Now he selected -25 attenuation ...that's right in the ballpark for good earphones.
I find my I5s with foam tips okay, with the stock tips a bit noisy.
My -33 foam earplugs is fall asleep relaxing, I can still hear the Scala for chatting but I miss the music.
Everyone will have different preferences....EVERYONE will suffer hearing loss from highway riding without some attenuation ...the helmets simply do not change a thing and in some cases make it worse.
If we up the ante to a more reasonable pace, say, 75-80 mph, we subject ourselves to approximately 105 dB wind noise. OSHA recommends exposure at that level be limited to one hour. Does that sound like fun on a long trip? Nope. So, what can we do?
That would be slabbing and even the ear plugs barely manage to make it reasonable.
Your call but at least now you have some physics and hearing standards to make your decisions on.