Note: The input terminals are marked with indicators to show their polarity. Per IEC standards, a
positive voltage on the positive marked input results in the transducers moving outward. Always
tie the cable down to the available hardware to minimize any buzzing or pullouts. If possible, after
wiring is completed, play sound through the speaker to identify any connection issues, buzzing, or
rattling. Refer to the figures in the wiring sections that follow.
3.6 Connecting and configuring the CS128LF
This section provides information on how to connect and configure the CS128LF.
About this task
To be sure speakers work correctly, you must connect all electrical components properly. You will need a wire
stripper to complete some tasks in this section.
Caution: Turn off all amplifiers when connecting loudspeaker wiring.
Procedure
1. Locate the input plate on the side of the CS128LF.
Figure 19: CS128LF input plate location
The input plate contains a flip-card that you can use to select the operational mode. To remove the flip-
card, pull it straight out (rocking it a little if needed). The flip-card orientation determines whether the
drivers are operated in parallel or individually. If you turn the flip-card so the arrow points to the left, the
wiring connection to terminal pair 1 drives both of the 15-inch speaker drivers in parallel. If you turn the
flip card so the arrow points to the right, each of the drivers is independent and must be powered
individually by separate amplifier channels. This requires connections to both wiring terminal pair 1 and
wiring terminal pair 2. (See the following two figures.)
Assembling the Dolby Speaker System 128
Dolby Speaker System 128 Owner's Manual
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8800293 Issue 2
27 October 2021