Movie to ipod(320 x 480), why always 44100 kHz?

when I view the info about the video I converted for ipod, the audio sample rate is always 44100, no matter what the .wav file audio rate is supplied. (I am using a 48000 wav into quicktime pro 7.0.4)
why is this?.
the options box is grayed out so I can not force quicktime to convert @ 48000 not 44100...
my exact process that causes this...
take video file into mainconcept mpeg encoder to de-interlace and reduce to 320 240. (mpeg2 stream type (video) to generate the mpeg video.
use mainconcept mpeg encoder to generate audio wav file from same video file (mpeg2 stream type 'elementary audio' audio mode 'WAV') to generate the sound file @ 16-bit (little Endian), Stereo, 48000 kHz.
import video into Quicktime 7.0.4, and add audio to video via (open audio file/ select all/ copy
then in video file window 'add to movie', then export/ movie to ipod(320 x 480).
amd 3700+s754 Windows XP Pro 2G ram, dfi ut nf3-250, aiw 800xt

thanks for the reply, but you are confusing sample freq. with sample rate.
reducing the sample frequency, reduces the maximum freq that can be reproduced (nyquist) so 22050 has the effect of removing all frequencies above 11025...
I want the sample freq to remain the same because any resampling of the freq reduces the quality of the audio.
I figure since the input audio is @48000 and ipod export downconverts it to 44100 @ 128kbs it must sound worse than if the frequency remained at 48000 (dvd audio freq)
(my feeling is that it is a bug in the 'movie to ipod(320 x 480)' settings.
ipod export uses avc(h264)(or mpeg-4 part 10) (basically it adds an in-loop deblocker etc (so that noise is reduced and hence better video)
and mpeg-4 is not as efficent. (in terms of bitrates)
amd 3700+s754 Windows XP Pro 2G ram, dfi ut nf3-250, aiw 800xt

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I believe the only way to make h.264 files for the ipod is be using the export movie to ipod settings.
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The movie to ipod export setting works for me, but when i use the movie to mpeg4 - h264 - to convert the file I can not load the movie on to the ipod.
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MPEG-4 video: up to 2.5 mbps, 480 x 480, 30 frames per sec., Simple Profile with AAC-LC up to 160 Kbps, 48 Khz, stereo audio in .m4v, .mp4 and .mov file formats.
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Movie to ipod(320 x 480), why always 44100 kHz?

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