Choosing a Tape Type

Some tape types are no longer available on the world market. Chrome and cobalt tapes are among them.

FERRIC TAPE: At present you can order duplication projects on Ferric Type 1 tape only. Ferric tape offers a deep booming base, warm mid-range tones, and excellent high frequencies up to 16 kHz (the upper end of most people’s hearing range).

CHROME TAPE: Some remaining chrome tape is still available at National Audio packaged into our 799 Series Studio Master tapes. However, it is no longer available in sufficient quantities for duplication projects. Buy individual tapes in our online store here.

COMING SOON! National Audio will soon release its long-awaited FerroMaster C456 tape. This new, ultra-high performance Super Ferric Type I oxide will deliver the highest signal-to-noise ratio (head room) ever achieved by a ferric cassette tape. FerroMaster C456 will be manufactured in our plant in Springfield, Missouri, USA. Stay tuned.

Use of Dolby Encoding

Dolby encoding of audio is intended to reduce the tape noise on the copied tapes, while leaving the original audio unchanged. Dolby encoding does not fix the sound of the master. Dolby is not recommended on duplication projects unless you are sure the listeners will have Dolby settings on their playback equipment.

Here’s how Dolby works. The original master is run through a Dolby encoder that basically boosts the upper frequencies while the audio is quiet, and doesn’t boost as much when the audio is loud (relative to a set threshold). The copy tapes are duplicated with this encoding of shifted frequencies; and when played back in a deck with Dolby B engaged, the decoder reverses the boosts that were added to the original audio by the Dolby encoder according to the program levels that it senses. The result should be that the original audio sounds unchanged, but the tape noise (most noticeable in the higher frequencies) of the copy tapes has been reduced by almost 10db.

Our sound engineers may be able to repair or improve imperfect masters. Contact Customer Service for more information on these services.