Why is it that I can record and listen to my 7' reel machine at 3-3/4 IPS and think that sounds terrible, yet I think cassettes sound just fine at 1-7/8 IPS?

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Why is it that I can record and listen to my 7' reel machine at 3

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3 3/4 IPS cassette playback, DC biased low-speed dub.

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Why is it that I can record and listen to my 7' reel machine at 3