2726
ZB-4.0 (Sonus RT & RT Deluxe) & ZB-4.3 (Sonus 519)
Description: Hand-assembled components housed in an
electrostatically shielded, epoxy module
Function: Master volume, pickup blend, bass,
midrange, and treble boost/cut with 3-posi-
tion midrange frequency switch
Specifications: Output level -10dBm
Power requirements: One 9-volt battery
Battery life expectancy: 500 hours continuous use
About the system
Master volume control. Controls overall volume level. Turning the con-
trol clockwise increases the volume; turning the control counterclock-
wise decreases the volume.
Pickup blend control. Controls relative blend of pickups. Turning the
control clockwise emphasizes the bridge pickup. Turning the control
counterclockwise emphasizes the neck pickup. The detent, or “click,” in
the center of the control is the point where both pickups are on equally.
Bass control. 15dB boost or cut of bass at a center frequency of 50
Hz. Turning the control clockwise boosts the bass. Turning the control
counterclockwise cuts the bass. The detent, or “click,” in the center of
the control is the “flat” position, zero boost or cut.
Midrange control. 15dB boost or cut of midrange at a center frequency
determined by the switch selection. Turning the control clockwise boosts the
mids. Turning the control counterclockwise cuts the mids. The detent, or
“click,” in the center of the control is the “flat” position, zero boost or cut.
Treble control. 15dB boost or cut of treble at a center frequency of
5kHz. Turning the control clockwise boosts the treble. Turning the con-
trol counterclockwise cuts the treble. The detent, or “click,” in the center
of the control is the “flat” position, zero boost or cut.
Mid frequency switch. Down position @ 250 Hz. Center position @
400 Hz. Up position @ 700 Hz.
Trimmer. This control on the circuit module attenuates overall output
level. Its factory setting is the mid position.
Caution: Setting gain too high may cause distortion.
Midrange
Treble (center)
Mid frequency switch (ZB-4.3 only)
Master volume
Pickup blend
Bass (outer ring)
Trimmer attenuates
overall output level
Trimmer sets pickup input
level (ZB-4.0 only)
(25 pages)
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