EQ Translation

⬤ 120µS via 70µS
This filter allows for recording a type II, III or IV cassette tape that is intended for being played back with 120µS EQ setting. Most cassette decks default to applying 70µS EQ when recording on a type II, III or IV cassette tape. Consequently, the recorded cassette will only sound accurate on players equipped with 70µS EQ. In case the intended player lacks a 70µS EQ option (such as a walky player or in-car player), activating this filter during recording effectively changes the playback EQ requirement from 70µS to 120µS.

⬤ 70µS via 120µS
This filter allows for recording a premium type I cassette tape that is intended for being played back with 70µS EQ setting. When recording on a type-I cassette, most cassette decks default to applying 120µS EQ. Consequently, the recorded cassette will only sound accurate on players equipped with 120µS EQ. In case where 70µS EQ is preferred for lower noise, activating this filter during recording effectively changes the playback EQ requirement from 120µS to 70µS.

⬤ Nak to Others
In the cassette standard, the playback frequency response is only specified up to 12.5kHz, with the higher frequencies marked as "optional" with no specified tolerances. Nakamichi cassette decks, featuring specialized playback heads, require less compensation for the high-end frequencies on the recording side. As a result, cassette tapes recorded on Nakamichi decks might virtually/slightly lack of high-end frequencies when being played back on a non-Nakamichi deck, especially when Dolby-B/C NR is involved. Engaging this filter can compensate for such a nuance. This filter is not necessary when the recorder and the player are both Nakamichi's.