O'Connell had previously been nominated a record 20 times without success before he picked up the Sound Mixing Award for his work on 'Hacksaw Ridge' last night.
Engineers David Thomas, Lawrence E. Fisher and David Bundy recognised for 'advancing the state of wireless microphone technology'.
The Academy Awards for Sound Editing and Sound Mixing both went to the crew working on last year's post-apocalyptic action epic.
With the season for prestigious prize-giving now over, our columnist asks whether a new system of recognition is required.
PMC tech used at massive Hollywood event