To be clar gents, having the apeaker on while using the headset isn't a problem, as much as an annoyance. It's more like all the radio comms sound just a bit off.
Someone earlier mentioned ANR + speaker. I've seen this done. One guy prefers ANR, the other prefers the speaker. If you turn off the headset audio, no problem communicating. I imagine we'll see a bit more of this with the new Bose headset that's due to be released any time now.