They were getting 33.6kbps out of a fully analog phone line with 300Hz-4Khz usable frequency range. Depends on the equipment and tape, but I imagine even cheap

They were getting 33.6kbps out of a fully analog phone line with 300Hz-4Khz usable frequency range. Depends on the equipment and tape, but I imagine even cheapish equipment would have at least twice that amount of bandwidth to work with, maybe even up to 10-12kHz instead of a 4kHz top end. High end equipment and high end tape shows up to ~20kHz or so: https://audiochrome.blogspot.com/2019/12/cassette-tape-comparative-measurements.html https://audiochrome.blogspot.com/2019/12/cassette-tape-compa...