2120
ZP-4 MODELS: Sonus 4/2 & 5/2
Description: Class A design with studio-grade compo-
nents on a printed circuit board
Function: Active master volume, pickup blend. Bass,
treble and internal midrange boost/cut
Specifications: Output level +16dBm. S/N ratio 100dB
Power requirements: One 9-volt battery
Battery life expectancy: 200 hours continuous use
About the system
Volume control. Unlike passive volume controls that decrease the volume
by shorting some of the signal to ground, causing degradation in tone, the
active volume control on the ZP4.3 allows the volume to be set to any level
without overall loss of highs or tonal change. Play a note, let it ring while
slowly turning this control up and down, and you’ll hear no change in tone.
Pickup blend control. Buffered inputs provide exacting control over
blending the neck and bridge pickups. This feature allows even the most
subtle blend, for a greater variety of tone. Turning the control clockwise
brings in the bridge pickup. Turning the control counterclockwise brings in
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 30 Hz.
Turning the control clockwise boosts the bass. Turning the control counter-
clockwise cuts the bass. The detent, or “click,” in the center of the control
is the “flat” position, zero boost or cut.
Internal midrange control. 15dB boost or cut of midrange at a center fre-
quency of 330 Hz. Turning the control clockwise boosts the mids. Turning
the control counterclockwise cuts the mids. The midpoint in the control’s
sweep is the “flat” position, zero boost or cut.
Treble control. 15dB boost or cut of treble at a center frequency of 3kHz.
Turning the control clockwise boosts the treble. Turning the control coun-
terclockwise cuts the treble. The detent, or “click,” in the center of the con-
trol is the “flat” position, zero boost or cut.
Gain trimmer. Attenuates overall output level. Factory setting is mid posi-
tion.
Caution: Setting gain too high may cause distortion.
MID FREQ
GAIN
TRIM
9-Volt Battery
Master volume
Pickup blend
Treble (center)
Bass (outer ring)
Gain trimmer
Internal midrange control
(25 pages)
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