Sorry for resurrecting this old thread, but I have an update. I've been screwing with this setup, finally settling on gluing 1/8" foam to the outside of the cups, and gluing that to the inside of the chin strap and anchor. The foam was to dampen noise directly (physically) transferred from the helmet to the muffs. Note that my 2XL helmet isn't large enough to fit the air bladders like I'm supposed to use. I can barely squeeze my head between the muffs, even without the bladder and a couple layers of Velcro that they come with. Even now, the muffs fit tight, but not uncomfortably tight. I seriously doubt there are noise leaks -- the chin strap pulls them even tighter.
I thought this was working because I couldn't hear the engine shift-points or even when I was about to stall it from a standstill. I did report a loud low-frequency noise, which is much like sitting in the back of a 727 (near the engines). I thought this was always there, just masked by the noises the muffs were blocking.
Due to bad star alignments, I haven't been able to test more than about an hour ride, but yesterday I took an all-day ride in this helmet. I came home much more deaf than normal. I couldn't hear things that I could that morning; and the things in the house I did hear were oddly distorted. My hearing seems to have mostly recovered last night.
I haven't been that bad after wearing no noise protection at all. I think these muffs actually amplified some noises, and my ears didn't like it. I'm about ready to declare this effort a failure. I still haven't tried with ear plugs too, but what's the point? And I still won't hear shift-points.
> I hate how run down I get if I don't wear ear plugs.
Amen, Barry.
> I find custom molded ear plugs to be a simpler, and effective means of dealing with noise.
I might have to go there after all. But $130 is getting close to active noise cancelling.
A list of noise-cancelling earbuds:
https://headphonesaddict.com/best-noise ... g-earbuds/. And here's the best reviews I can find:
https://www.rtings.com/headphones/reviews.
Here's a good m/c review of $240 buds:
https://advrider.com/f/threads/bose-qc2 ... w.1157477/). At a much lower price point, Audio-Technica make a few similar models (ATH-ANC23, ATH-ANC33iS, ATH-ANC40BT). ATH-ANC23 doubled in price since the above list; Rtings wasn't too impressed with any of them; but some bikers have liked them (ATH-ANC23, but they all seem pretty similar).
"I use these when riding my motorcycle. These are replacing a 5 year old set of noise cancelling earbuds that has simply worn out from use. I am very satisfied with the old set, but they aren't made anymore. So, I bought these with high hopes. The battery case is much smaller that I anticipated (that's good!) and the wires are plenty long. It comes with several sizes of ear pieces including a foam set and I used the size that was the same as my previous set of earbuds. But, when I rode my motorcycle, the noise reduction wasn't near as good, so I was initially disappointed. After using these for awhile I was comparing the silicon ear pieces and the ones that came with these earbuds seemed very thin compared to my older set, so I changed them out. WOW! That made a huge difference and now I can say that these perform as good, or even better, than my old set. My advice is to change out the ear pieces with some after market or from an old set if you don't like the reduction as it comes."
Here's a review of dumb earplugs, dunno how old:
https://www.earplugsguide.com/best-moto ... ear-plugs/