Hi, ErrolHolt, if you have questions about the sound clips or other materials on this site, other than what's posted on the Web Board, you should contact Cal, the Webmaster: cal@clinteastwood.org
I would tend to assume that the reason for the relatively low quality of the files is partly to keep the file size down, and partly because it is copyrighted material.
If you want a high-quality version of this clip, why not buy or rent the film yourself and make your own? You would be doing those who love Clint Eastwood's films a favor, because the more videos he sells or rents ... the more he'll make!
