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Edit: Moutere there's a guy on Bladeslapper fitting A20 to Alpha helmets, might be worth looking into.

I find it great, was always told ANR useless in a turbine especially with doors off, but have found it works well for me (Doors off 99%). Also run earplugs and can have radio turned well down. Only...

Not a direct comparison, but I run a Bose A20 in my helmet (MD500, on Ag). Can't fault it, great noise reduction, and battery life. Reckon the recommended Bose headset will definitely suit your...