I am producing training videos for my business and am using a Sony DCR-TRV38 Handycam. I record interviews and me speaking using a Sony WCS-999 wireless microphone system, and edit the whole thing on a MacBook Pro using iMovie.

Here is my challenge: When I watch the playback on the Handycam, the audio is in crisp stereo and sounds great. When I download it to the MacBook, the audio is one sided ("mono", menaing coming out of one speaker only) and sounds horrible.

Why does the audio sound great on the handycam and lousy once it gets on the computer, and how can I return it to stereo-quality sound?