14.24 What is Type I, Type II, Type III, and Type IV cassette tape?
Description
This article is from the rec.audio.* FAQ, by with numerous contributions by Bob Neidorff others.
14.24 What is Type I, Type II, Type III, and Type IV cassette tape?
These are IEC (International Electrotechnical Committee)
standards. They provide broad standards for all tapes,
and end the need to align a deck for an individual tape.
Type 1 is for normal "iron oxide" tapes (Fe2O3), Type 2
is for high-bias "chromium oxide" tapes (CrO2), Type 3
(obsolete) is for FeCr (ferric chrome), and Type 4 is
for Fe (Metal). Type 2 tapes tend to be more expensive
than type 1, and type 4 tapes are the most expensive.
This is because type 2 tapes tend to have less noise and
flatter high frequency response than type 1, and type 4
tapes tend to have even flatter highs and even less noise.
Some Type 1 tapes are more expensive than other Type 2 tapes,
and may be worth the extra price. More expensive tapes come
in better shells, have better lubrication, fewer dropouts,
smoother frequency response, and better uniformity from tape
to tape. Even though the types imply a particular tape
formulations, the type really refers to the tape performance.
For example, some iron oxide tapes have an unusual oxide
formulation with very small grains that conforms to the type
2 standard better than the type 1 standard. These tapes
will be labeled type 2, but may not have any chrome in them.
Most modern cassette recorders sense the tape type by the
holes in the back of the housing and adjust bias and
equalization to compensate for the differences. A few
top cassette recorders (the Revox and several Nakamichis)
automatically align to a particular tape by recording test
tones and then setting their own equalization.
In practice, each brand and model tape is slightly different.
For the very best recordings, adjust your recorder for the
tape you use most, or buy the tape which works best in your
recorder. Manufacturers adjust each recorder for a specific
tape at the factory. So the best tape might be the one
referenced in the recorder owner's manual. In a recording
studio, it is common to align the bias and equalization for
the specific tape used, and stick with that tape.
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