Thanks for comment.
BTW, the FreeCom 7000 Pilot Headset is ANR and custom mold.
The different between noise reduction of active and passive was really large?
BTW, I will consider FreeCom 5000 (passive) and FreeCom 7000 (active) and Clarity Aloft. (As tbone and mach 1 were no longer exist......)
Yes, I know that the ANR should be better, however it need battery all the time and the weight is much higher than passive one, isn't it?
However, I still look for some Custom made headset with Build in MIC function which like Tbone but with ANR and PNR.