JBL Cinema 300 - Wiring Diagrams for 3000 Series Screen Systems; Wiring Diagrams for 4000 Series Screen Systems

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When completely new product groups or model numbers are introduced, JBL is in compliance with
the EIA standard. When older products are modied with no change in the basic model number, or where new
products will be required to interface with older ones, JBL usually maintains the negative convention to avoid
confusion in the marketplace. In any event, all new positive convention products carry a legend to that effect next
to their input terminals. Here is a breakdown of polarity conventions for JBL cinema product groups:
For maintaining absolute system polarity through the entire A- and B-chain of theater systems, we
strongly recommend that polarity inversions, when they are required, are made at the input terminals to the screen
loudspeakers. Making the change at any other point in the chain is likely to cause confusion.
B. Wiring Diagrams for 3000 Series Screen Systems:
Figure 33A shows proper amplier/loudspeaker hookup for the models 3677 and 3678, both operating in
a single-amplier mode. The model 3678 is also congured to operate in biamplied mode, as shown at Figure
33B. Note that this change requires removing four jumpers from the terminal strips of the dividing network.
C. Wiring diagrams for 4000 Series Screen Systems:
Figure 34A shows the correct method for wiring the components of the 4675C, and Figure 34B shows
the correct method for wiring the 4670D. The 4675C-4(8)LF combination is always biamplied, either using the
THX electronic dividing network or one of the input options on the power amplier. The correct wiring, with polarity
adjustment, is shown in Figure 34C.
Figure 33: Wiring diagrams for 3000 Series. Passive network operation (A); biamplied operation of 3678 (B).
3000-Series All positive
4000-Series
4670D Positive
4675C Positive
4675C-4(8)LF Negative
5000-Series All negative
4600-Series subwoofers All positive
Surround systems All positive
ScreenArray systems All positive