Impedance
I am in the process of buying a helmet, and have decided to go for Alpha Eagle.
I have been in touch with Headset service in UK and told them that I fly R44 and AS350 and they tell me that the impedance I need is 600 ohm, but my local avionics dealer says it is 150 ohm, anyone who can tell me what is right?
I'm also not quite sure what the right code for the downlead plug is.
Nice if someone could help because a helmet is a big investment and it would be annoying to get one that is not right for me.