A little description thingamajig on tape bias!
Bias is a unique signal that is applied when recording on tape. There are two types of bias, AC and DC. Back in the good ol' days, DC was where it was at. The first recorders simply added the raw audio signal to the electromagnet in the record head. In other words, it is the direct current being added to the recorded audio signal. The problem with DC bias is that it results in poor low-frequency response and high distortion.
Later on, when people got their shiit together, AC bias was invented. This was a new and improved bias that resulted in less noise. AC is the addition of an inaudible high frequency signal to the recorded audio signal. This signal usually ranges between 40kHz - 150kHz. Bias increases the audio quality by pushing the signal into the linear zone of the tape's transfer function.
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