Premium Type I

Premium Type I — Super Ferric Blank Cassette Tapes

Super ferric tapes represent the pinnacle of Type I formulation engineering. Through the 1980s, manufacturers refined cobalt-doped and cobalt-adsorbed ferric oxide particles — known as ferricobalt — to push Type I performance far beyond what basic gamma ferric oxide could achieve. By the early 1990s, the best super ferric tapes (TDK AR-X, Maxell XLI-S, BASF Ferro Maxima I) were priced at parity with entry-level Type IV metal tapes and measured close to them in dynamic range and signal-to-noise ratio.

Super ferrics retain full Type I compatibility — every deck supports them with no setting changes — while delivering significantly lower noise floors, higher maximum output levels (MOL), and extended high-frequency response compared to standard ferric tapes. They use the same 120 μs equalization and normal bias as any Type I tape, meaning they work perfectly even on decks without a metal position.

Key super ferric models: TDK AR and AR-X (Japan's audiophile reference Type I through the 1980s–1990s), Maxell XLI-S (widely regarded as one of the finest Type I tapes ever produced), BASF Ferro Maxima I and Ferro Super I (German engineering at its finest), Sony AHF and ES-I, and That's FX/TX series.

Who are super ferrics for? Collectors and recording enthusiasts who want the absolute best Type I performance for a well-calibrated deck, and anyone who appreciates the warmer, more natural midrange character of ferric oxide combined with near-metal noise performance.

All tapes are NOS sealed. Free US shipping on orders over $50.

Frequently Asked Questions

What is a premium Type I or super ferric cassette tape?

Premium Type I tapes use cobalt-doped (ferricobalt) oxide particles refined to significantly higher coercivity than standard ferric. Called 'super ferric,' these tapes deliver lower noise floors, higher output levels, and extended treble response while remaining fully compatible with the normal bias Type I setting.

How does super ferric tape compare to metal tape?

The best super ferric tapes — Maxell XLI-S, TDK AR-X, BASF Ferro Maxima I — were priced at parity with entry-level Type IV metal tapes by the early 1990s and measured within a few decibels of them in dynamic range. They offer near-metal performance with Type I convenience.

What are the most sought-after premium Type I cassette tapes?

Maxell XLI-S (especially 1988 Japan C-90) is widely regarded as the finest Type I tape ever produced. TDK AR and AR-X dominated the Japanese audiophile market. BASF Ferro Maxima I and Ferro Super I represent German precision engineering. Sony AHF and ES-I are also highly regarded.

Do super ferric tapes need a special deck setting?

No — super ferric tapes use the standard normal bias (Type I) setting on any deck. No metal position or special calibration is required, which is part of their appeal: near-metal performance without needing a deck with a metal position.

Are premium Type I cassette tapes still available?

New production of premium super ferric tapes ended with the decline of the cassette format in the early 2000s. All available examples are new old stock (NOS) — factory-sealed tapes from original retail or warehouse inventory, increasingly rare and sought by collectors worldwide.