Why is this file so large?

I recorded a slide show in Keynote 08 and exported it to a medium sized Quicktime movie. The file size is 5.5 MB
I then extracted the audio track and edited it in another app (Sound Edit) and saved it as AIFF. (4.8 MB)
I opened the AIFF in QT (7.6.4) selected all and added it to the QT movie. The file plays as it should and the sound is better but the file is now 39.7 MB.. How come adding 4.8 to 5.5 comes to 39.7? and what might I do about it?

The decisions will depend upon your ultimate goal for the video. Are you doing this for a web page, for viewing on a projection screen, on a computer? What is the nature of the video (real life, animation?). Generally the goal is the best quality image and sound possible, but it s always a trade-off with file size (and bandwidth if putting on a web page). If you're making something for playing on an ipod then you don't need the same image size that might end up on a projection screen and can save a lot of size that way.
I can say for a start that AIFF is usually not the best choice for audio format if size is critical. AIFF is not compressed so it will take up roughly ten times the amount of space that a compressed format (MP3, AAC/MP4audio). If you started off with a compressed format and then convert to AIFF you will not regain what was lost when the sound was compressed.
I don't know all the Quicktime formats. I haven't actually made a Quicktime video in quite a while. I use other tools. My copy of "Quicktime Pro" is about 15 years old, although it still can access many of the codecs the new version can.

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