8-tracks run at twice the speed of cassettes and have the same track width, so in theory, they are capable of better fidelity than cassettes.
In reality, this is almost never the case for several reasons:
- The 8-track has more wow and flutter due to design deficiencies. The tape is being simultaneously pushed and pulled, and then rubbed up against itself and twisted around in the loop inside the cartridge as it plays, so pitch control is never stable, not to mention that the tape wears out very quickly
- Crosstalk (hearing the adjacent program faintly in the background) is almost inevitable due to the moving playback head design
- As 8-tracks went into decline starting in the late 70s, many tape and recording improvements than went into the cassette never really made it to the 8-track (chromium dioxide tape, Dolby HX, etc.)
- Very few 8-tracks are currently playable without repair, again due to design issues: the splice which joins the loop often comes unglued, and the foam pads which push the tape against the playback head break down and disintegrate
- but most of all, high-speed tape duplication wasn't so good back in those days, so the results sounded HORRID.
Even when repaired and played on a decent deck, the majority of pre-recorded 8-tracks don't sound much better than AM radio, both in terms of frequency range and signal-to-noise ratio. And then you have the silliness of songs fading out at the end of each program unless the album can be divided into four equal parts.



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