dynalead
mentioned Barclay Crocker Tapes, and DBX Noise Reduction was just mentioned by crustycoot.
Only late R2R machines had DBX, my late Teac x2000r has DBX-1, called Professional Noise Reduction.
Later, good quality Cassette recorders has DBX, AND tape formulations during the cassette era were progressively improved. Tape movement was vastly improved, all combined so that a format developed for mono dictation could actually sound very good with a very small track width: 4 tracks on a 1/8" wide tape. This compared to commercially recorded R2R 1/4" wide tape.
Back to Barclay Crocker. A great many of them were DBX, and you needed a tape deck with built-in DBX NR equalization capabilities to play them, just as you need a phono equalizer for LPs.
Studio recorders used 1/2"; 1"; 2" wide tape, the re-mastered LPs etc. hopefully made using them. 15 or 30 IPS, and Mercury used a version of 35mm film tape for superior recordings.
IMAX movie film is 70mm (2-3/4") wide; and is projected running horizontally, not vertically like 35mm. Horizontally allows taller images