This control adjusts the amount of bias in the record signal.
Bias is defined as an oscillator beyond the audible range ap-
plied to the audio at the record head, allowing for adjustment
of the record behavior. Ideal bias voltage settings provide maximum record
sensitivity and low distortion. Intentionally overbiasing is a common technique
especially for “tape compression” which produces a warmer, gently satu-
rated sound. Underbiasing can also be used to add distortion and other non-
linear responses, similar to gate chatter or cold solder joints; extremely low
voltages may even cause audio to drop out entirely.

Bias voltage, HF/Shelf EQ, and Emphasis EQ (CCIR, NAB, AES) all work to-
gether to provide a linear response to the recorded signal. The “flat” (cali-
brated position) is determined by tape speed, tape type, emphasis EQ, and
head width.

Noise Enable

This is a global enable control for the

Hum

and

Hiss

effect.

When Noise is ON, the level of Hum and Hiss can be indepen-
dently adjusted using the Hum and Hiss Level controls.

The default values of 0 dB for Hum and Hiss are the actual modeled level in
the original hardware. Noise is not affected by automatic calibration.

Hum

Determines the amount of Hum in the signal. Hum is added after the
tape circuitry. This control affects both the left and right channels.
Noise Enable must be ON for the Hum control to function.

The default value of 0 dB for Hum is the actual modeled level in the original
hardware. This default value can be offset by ±25 dB.

The Hum frequency is dependent on the Emphasis EQ control (

page 154

The frequency is 60 Hz when set to NAB (US) and 50 Hz when set to CCIR
(European).

This manual is related to the following products:

TDx Transient Designer 500 Series Dynamics Processor Module