A few notes about foam plug passive headsets (Halo, Clarity Aloft, whatever) that have garnered praise in this thread:
- Many folks, including me, find them more comfortable overall than an over the ear headset - I used one for years until my hearing started waning, and I took a deep dive into the data on noise attenuation by foam plugs.
- Their high frequency noise attenuation is excellent, superior to over the ear passive headsets, on par with good active noise cancellation headsets
- Their low frequency noise attenuation is poor, certainly no better than a cheap passive over the ear headset
- In contrast to jets, the serious, hearing damaging noise made by our piston planes is in the lower part of the spectrum, which is protected poorly by foam plugs
- The low frequency noise in our Mooneys is destructively loud and adds cumulative damage to hearing each time we fly with a passive headset, be it over the ear or foam plug-based.
The decreased fatigue with a good ANR headset is also dramatic vs. any passive headset. I very much regret the 7 years or so that I spent flying with a foam plug headset. I recall seeing Phil McCandless, founder of Quiet Techologies (Halo headsets), at Oshkosh this year standing under a banner saying something like "ANR quality sound attenuation at a fraction of the cost." For piston planes, this is egregiously false advertisting that is contributing to lasting hearing damage for pilots like us. Dr. McCandless also has a doctorate in audiology and should certainly know better. His website also contains various related falsehoods.
Here's an old thread that contains links to relevant data: