JBL VT4889ADP User Manual page 19

DPIP – Basic Input Module
See Figure 1a
The Basic DPIP input module features analog audio inputs and sophisticated onboard digital signal
processing technology. Precision Bandpass limiting, pre-equalization filters and automatic self-test functions
ensure optimized performance. JBL engineers have calibrated DSP speaker management and limiter
parameters to insure smooth phase response and
transfer function curves right out of the box.
CONTROLS
1) Subwoofer Filter Enable Select Switch
a) Momentary, Enables or disables the selected
function. On subwoofer applications the low-
pass frequency is set to 80 Hz and for full
range systems the high-pass is raised to 80 Hz.
(Knee shape and slopes are model dependent).
7) Input Sensitivity/Attenuation Control:
a ) 16 dB Precision Detented rotary control, 0.5
dB steps. Sensitivity + dBu nominal (+ dBu
clip) with the control fully counter clockwise,
and -10 dBv nominal (+ dBu clip) with the
control fully clockwise.
INDICATORS
2) Subwoofer Filter Enable
a) Orange LED, illuminates when the
function is enabled.
3) FAULT
a) Red LED, illuminates during any
fault condition.
4) THERMAL PROTECTION
a ) Orange LED, illuminates during
thermal limiting:
a i) PULSING indicates first stage of thermal
limiting, amplifier output level is reduced to prevent overheating.
a ii) FLASHING indicates transducer thermal limits have been exceeded. Further reduction in
output level is applied.
a iii) SOLID illumination indicates thermal protection is in the third stage of
protection and amplifier shut down may occur if immediate
action is not taken to correct the external reason for excessive heating of the amplifier.
5) Ready
a) Green LED, illuminates when the system is
ready for operation.
6) SIGNAL/CLIP
a ) (Signal) Green LED, detects input signal above the threshold set at –70 dBu. b) Yellow indicates
that the audio drive signal has exceeded limits preset in DSP on any channel and compression/
limiting is active.
c) (Clip) Red LED, Clip detection monitors input, DSP, and each amplifier output channel. The LED
changes from Green to Red when clipping THD at any point is detected.
CONNECTORS
8) Audio In
a) F-XLR Active 0K Ohm Balanced, 10K Ohm Unbalanced.
b) Pin  Hot (Positive voltage produces outward cone motion of L.F. Transducers).
9) Audio Out
a) M-XLR Passive Audio Pass-through.
b) Pin  Hot (Positive voltage produces outward cone motion of L.F. Transducers).
Figure 1a
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