Bass and Treble Controls

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, then pulling to the fully extended position. This affects the high audio frequencies and has a center frequency of 10kHz. The center position of a given control indicates the flat response over that particular frequency range.

Moving a control to the right of center position produces boost. Moving a control to the left of center position produces a cut in frequency range related to that control. All units incorporate a loudness feature that automatically increases bass bias at low listening levels. On the Auto Tone Control (ATC) models, any adjustment of the controls activates the MANUAL ATC mode. The adjustment of the 'controls establishes the MANUAL ATC mode as default. The MANUAL tone mode displays on the ATC models. The bass and treble changes do not affect the radio display on non-ATC models.