Replacing one sound louder at the ear to cover a loud noise does not protect the ear at all and that is EXACTLY what the music type headphones are doing. It's not protection in the least.
I also have two pair of different Senns and they are fantastic! I even used them for a short time in the shop until I realized all I was doing was cranking them up doing what I tell my kids not to do.
Music type headphones simply do not save the ear drum. Just put them on and dont run music or sound through them, one second of that and using a loud machine, even an ETS and CT on low will prove they dont do a darn thing.
Once you get a true hearing projection with a speaker for sound, whether Bluetooth or not, I bet you won't ever go back to regular headphones( Senn's, Bose or whatever) in the shop again.
Even without music I cannot hear the extractor or most tools. I actually think this is more dangerous, as in leaving equipment running because you cannot hear it. The issue is I like listening to music when I work.
I think most, if not all, in this thread agree that drowning noise with noise is not the objective... If you have not tried earphones that actually attenuate noise even while not playing music you need to get out more.
I think it is as simple as horses for courses and for roughly 75% of my work (which runs from A-Z and back again in diversity) I get by, easily, with good ear plugs, small ones like the ones mentioned earlier in the thread.
I cherish my hearing and I am - like so many others - a bit of an audiophile and would _never_ risk my hearing. I am turning 45 and I still have very acute hearing despite being in this trade for the last twenty years.
Many people don't have a deeper understanding of dB and sound pressure in relation to the frequency range and the inherent dangers of _some_ of them. I have learnt some about it from a friend who is a renowned psycho acoustic researcher and who knows more about human hearing than, probably, all of the woodworking forum members combined. There is noise that can kill your ears swiftly and abruptly in no time and noise that doesn't do much at all even over a longer period - though sound pressure levels and exposure are exactly the same. All noise is not created equal and some is simply put, not even affecting the ear drums adversely much at all despite a high sound pressure level.
Knowledge is power and caution is key.
Some things I would never expose myself too but for a lot of the tasks as mentioned earlier in the thread light protection suffices - with margin to spare. I seldom use heavier ear protection but I have them in the work shop and one pair in the field kit and I definitely use them when I am in a situation that demands it. I have even used both silicone plugs and Peltors combined while watching some guys sandblasting a huge door - it was one of the worst types of noise I have ever been subjected too - jet engine type roar on a reflective surface in a confined space from a few meters away and still there were a few guys that had NO hearing protection and were looking on - playing tough and grinning away... I really pity them, it was as stupid as it gets.
As you can see in the photos there is no cord running under shirt with this simple hack. I hate cords. I do feel it is a bit bulky at times but I have the light option of having the iPod shuffle clipped to my glasses with a short corded pair of earphones that only run from ear to ear - they are my favourite.
Which fitted earphones did you get? I am interested in getting a pair myself, I value my hearing and feeling unrestricted and if the solution is great I don't mind shelling out for it.