Q: Is this compatible with Bose A-20?
A: Yes, this will work with the Bose A20 headset with the standard dual plugs.
Q: 2 questions: 1) Will this work for an observer of a two-crew cockpit whereby the observer will be able to hear and talk to both crew members? 2) How long is the cord from the male jacks to both sets of female jacks? Thank you.
A: Yes, this adapter will accomplish what you are trying to do. It will allow the rear seat passenger to hear and speak via the intercom. Unfortunately, the other mic will also be hot when one of the two people uses the PTT. From end to end the cord itself is approx. 5ft long.
Q: Double Headset Y Adapter - I need an adapter that will allow the rear seat passenger to hear radio transmissions and be able to communicate via the voice-activated intercom. He does not need to transmit on the radio. Does this cord do that. Also, need to make sure it doesn't affect the pilots ability to use his push to talk switch for transmitting on the radio. Are both mics live when he pushes the talk switch?
A: Yes, this adapter will accomplish what you are trying to do. It will allow the rear seat passenger to hear and speak via the intercom. Unfortunately, the other mic will also be hot when the one of the two people uses the PTT.