JBL Professional VT4887ADP-CN, VT4887ADP-AN, VT4881ADP-CN, DP SERIES Dpip Standard Input Module

Figure 1

DPIP – Standard Input Module

See Figure 1

The standard 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 +4 dBu nominal (+23 dBu clip) with the control fully counter clockwise, and -10 dBv nominal (+4 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:

ai) PULSING indicates first stage of thermal

limiting, amplifier output level is reduced to prevent overheating.

aii) FLASHING indicates transducer thermal limits have been exceeded. Further reduction in output level is applied.

aiii) 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 20K Ohm Balanced, 10K Ohm Unbalanced.

b)Pin 2 Hot (Positive voltage produces outward cone motion of L.F.Transducers).

9)Audio Out

a)M-XLR Passive Audio Pass-through.

b)Pin 2 Hot (Positive voltage produces outward cone motion of L.F.Transducers).

JBL Professional 19