• The close spacing of the woofers to each other combined with placing the pair toward the top of the
cabinet improves system vertical dispersion.
• Rubber feet on the bottom of the cabinet help with stability and isolating the cabinet from transmitting
vibration to the building structure.
• Dual side acoustical ports (one on each side of the cabinet) can be used as integrated handles to improve
safety and comfort during handling and installation.
• BKT.FLR floor bracket kit, which is available from Dolby (sold separately), enables secure installation of
the speaker system to the building structure. The kit includes two brackets and four M10 washers.
• The CS128LF attachment points are for connecting to the auditorium building structure only; they are not
intended for hanging or flying the speaker. Always adhere to local building codes in your region.
• The advanced input plate features a high-current, spring-loaded terminal block, which enables quick
installation with no crimp tools or spade lugs needed, vastly simplifying installation.
2.4 Dolby Speaker System 128 wire selection
This section can assist you in selecting the correct wire gauge.
Typically, no more than 0.5 dB ( or 11%) of power should be lost in the cabling. The Dolby Speaker System
128 connectors accept an American Wire Gauge (AWG) of 18 AWG to 6 AWG (1 mm2 – 16 mm2). Typically, a
wire gauge of 16 AWG to 12 AWG (1.5 mm2 – 4 mm2) is recommended. The following sections provide basic
information regarding the Dolby Speaker System 128 input plates, choosing between the two modes of
operation, installing the wiring, and detailed information regarding speaker operating modes.
Note: The input terminals are marked with indicators to show the polarity. Per International
Electrotechnical Commission (IEC) standards, a positive voltage on the positive marked input results
in the transducers moving outward You must verify the positive and negative markings for each
respective product. 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.
2.5 Dolby Speaker System 128 installation information
In a typical auditorium, Dolby Speaker System 128 is installed behind the screen, with the acoustic center of
the speaker located two-thirds of the distance from the bottom of the screen.
The placement of the speakers behind the screen should follow guidance found in Dolby Atmos
Specifications for cinema, or industry standard guidance in the case of a 7.1 screen. To improve localization
and smooth pan-throughs, larger cinemas can benefit by adding left-center and right-center screen speakers.
You may need to build a screen platform to position the speaker system to the correct height. A screen
platform must be secured to the building structure. You must consult a licensed professional engineer
regarding design and construction of a screen platform.
Caution: Design and construction of a screen platform must be performed by a qualified, licensed,
and insured professional in accordance with all laws, rules, and regulations applicable to the
installation site. Failure to do so could result in serious personal injury or even death.
Dolby Speaker System 128 wire selection
Dolby Speaker System 128 Owner's Manual
9
8800293 Issue 2
27 October 2021
