The FLP lecture recordings posted at The Feynman Lectures website are "archival" recordings derived from the original 1/4" reel-to-reel tapes, which were digitized at high-resolution in 2010. They are "archival" in the sense that no editing or audio-engineering was applied to them before they were reduced to podcast quality for publication online. We used the best OGG and AAC codecs available, and all but the first lecture, which was recorded poorly in 1961, are "good enough" in the sense that you can understand everything Feynman is saying - in fact I think they sound pretty good. Basic Books, the publisher of FLP, is currently working on a commercial edition of the lecture recordings, which will be edited and audio-engineered, so they should make audiophiles happier, but for the purpose for which they are intended, learning physics, I think the online versions (other than the first lecture) are more than adequate.
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