![Cassette duplication diy](https://kumkoniak.com/28.jpg)
![cassette duplication diy cassette duplication diy](https://64.media.tumblr.com/8c7aefc7cbe03713847c758df6e35311/tumblr_ot50zbKZHI1sbbzzco1_1280.jpg)
Get your mix good and rms levels proper and master to a disc, then duplicate that to cassette.
![cassette duplication diy cassette duplication diy](https://3.bp.blogspot.com/-uTxn4SXaxkw/VyanB7CG7XI/AAAAAAAAV1M/KgR8-CG93kkHrB-tKfEc_wyGShBltyb-gCLcB/s1600/3d%2Bart%2Bsupplies.jpg)
High bias tape can take +6dB on an accurate meter.
![cassette duplication diy cassette duplication diy](https://www.duplication.ca/audio-cassettes/Cassettes_Large_Size/cassette_with_paper_label.jpg)
Stick with B reduction for best compromise of fidelity and hiss. Most people using cassettes have this setting on their decks, and it was the standard for more years than any other like C, HX PRO. I would use Dolby B like the big companies did for years with great sucess. High bias tapes have a notch next to these breakout tabs and normal bias just has the breakout tabs and no notch. The newer decks used additional switches next to the record tab switch to indicate high or normal bias. That is why you could hear the difference on old decks with manual bias switches when toggling from 70 to 120us on playback.
![Cassette duplication diy](https://kumkoniak.com/28.jpg)