Bass and Treble Controls (BASS) (TREB)

Bass and Treble controls are separate rotary control knobs. Each control is used for adjusting the system's audio frequency response. Operate the BASS function by first pressing and releasing the knob to the out position. This affects only the lower audio frequencies and has a center frequency of 60 Hz.

Operate the TREB (treble) function by first pressing and releasing the knob to the out position. This affects the high audio frequencies and has a center frequency of 10 kHz.

The center position of a given control indicates a flat response over that particular frequency range. Moving a control to the right of center position produces boost, while moving a control to the left produces a cut in frequency range related to that control. All units incorporate a loudness feature that automatically increases the bass bias at low listening levels.

On Auto Tone Control (ATC) models, any adjustment of these controls will activate the MANUAL tone control mode. The MANUAL tone mode will display on the ATC models. On non-ATC models bass and treble changes do not affect the radio display.