Dolby Laboratories 128 Owner's Manual
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Dolby Laboratories 128 Owner's Manual

Dolby Laboratories 128 Owner's Manual

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Dolby Speaker System 128
Owner's Manual
27 October 2021
8800293 Issue 2

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  • Page 1 Dolby Speaker System 128 Owner's Manual 27 October 2021 8800293 Issue 2...
  • Page 2 1275 Market Street San Francisco, CA 94103-1410 USA Telephone 415-558-0200 Fax 415-645-4000 http://www.dolby.com Trademarks Dolby and the double-D symbol are registered trademarks of Dolby Laboratories, Inc. The following are trademarks of Dolby Laboratories: Dialogue Intelligence Dolby Theatre ™ ® Dolby Dolby Vision ®...

  • Page 3: Table Of Contents

    Aiming the Dolby Speaker System 128....................18 Working with electrical components....................22 Connecting and configuring the CS128MH...................22 Connecting and configuring the CS128LF.................... 24 Dolby Speaker System 128 and system components specifications............29 Dolby Speaker System 128 specifications.................... 30 CS128MH specifications........................31 CS128LF specifications..........................32 Dolby Speaker System 128 and system components dimensions............

  • Page 4: Important Safety And Regulatory Information

    Furthermore, Dolby is not responsible for the abuse of its products caused by avoiding compliance with inspection and maintenance procedures or any other abuse. Dolby Speaker System 128 Owner's Manual 8800293 Issue 2 27 October 2021...
  • Page 5 Always be careful when moving the CS128LF or the assembled Dolby Speaker System 128 and employ at least two people when attempting any relocation of the loudspeakers, as there is danger of tipping if the system is not secured to the building structure.

  • Page 6: Introduction To Dolby Speaker System 128

    Dolby Speaker System 128 delivers consistent audio coverage and uniform volume shading for every seat in the venue up to approximately 66 feet (20 meters) in depth. The Dolby Speaker System 128 consists of a CS128MH loudspeaker for mid and high frequencies and a CS128LF loudspeaker for low- frequencies, providing greater intelligibility and enhanced low-frequency extension.

  • Page 7: About This Documentation

    About this documentation 2.1 About this documentation This documentation provides key features & benefits of the Dolby Speaker System 128 and how to install the system in a typical cinematic exhibition environment. 2.2 CS128MH key features and benefits The Dolby Speaker System 128 utilizes one CS128MH unit, which consists of an asymmetrical high-frequency horn with a high-performance transducer, and a low distortion 12 inch midrange.

  • Page 8: Cs128Lf Key Features And Benefits

    Introduction to Dolby Speaker System 128 Figure 3: Dolby asymmetrical horn coverage 2.3 CS128LF key features and benefits Dolby Speaker System 128 utilizes a single CS128LF to produce low frequencies. Figure 4: CS128LF rear (left) and front (right) • Each unit contains two 15-inch woofers that can be driven in parallel or driven individually to maximize available amplifier power.

  • Page 9: Dolby Speaker System 128 Wire Selection

    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 –...
  • Page 10 Introduction to Dolby Speaker System 128 Figure 5: Typical auditorium installation The elevation of the speaker system should be located with the acoustic center of the horn positioned exactly two-thirds the distance from the bottom of the screen. The acoustic center of the speaker system is 1.6 m (63 inches) above the building structure from which it is secured.
  • Page 11 Figure 6: Dolby Speaker System 128 acoustic center The Dolby Speaker System 128 is designed to be placed as close to the screen surface as possible with a minimum distance of 5-7 cm. This minimizes high-frequency reflections (screen loss) but does not locate the speaker too close to the screen.
  • Page 12 Figure 7: Dolby Speaker System 128 screen planes GLL format files for software simulation modeling There are .GLL files that you can use to simulate the Dolby Speaker System 128 in acoustical simulation software. You can download the .GLL files at https://www.dolby.com/us/en/professional/cinema/products/...

  • Page 13: Additional Information

    Send an email to cinemasupport@dolby.com. • Call: Americas: +1-415-645-4900 Europe/Middle East/Africa (EMEA): +44-33-0808-7700 Asia-Pacific (APAC): +86-400-692-6780 Japan: +81-3-4520-9798 Access documentation Visit https://customer.dolby.com. Submit feedback about this documentation Send an email to documentation@dolby.com. Dolby Speaker System 128 Owner's Manual 8800293 Issue 2 27 October 2021...

  • Page 14: Assembling The Dolby Speaker System 128

    Assembling the Dolby Speaker System 128 Assembling the Dolby Speaker System 128 You will need to secure the CS128LF to the building structure, and then install the CS128MH onto the CS128LF. Note: BKT.FLR floor brackets are available from Dolby (sold separately) to secure the speaker system to the building structure.

  • Page 15: Securing The Cs128Lf

    Attention: The Dolby Speaker System 128 was designed to be placed as close to the screen as possible, within 5-7 cm. When aiming the system, angling of the CS128MH may require that the...
  • Page 16 Assembling the Dolby Speaker System 128 Figure 8: Securing the CS128LF Dolby Speaker System 128 Owner's Manual 8800293 Issue 2 27 October 2021...

  • Page 17: Installing The Cs128Mh Onto The Cs128Lf

    The bolts must remain loose enough to allow the cabinet to slide into the yoke as described in step 6 (see the following figure for M10 yoke mounting locations). Dolby Speaker System 128 Owner's Manual 8800293 Issue 2 27 October 2021...

  • Page 18: Aiming The Dolby Speaker System 128

    3.3 Aiming the Dolby Speaker System 128 Use the information provided in this section to aim the Dolby Speaker System 128 for precise sound distribution. About this task The following tools are needed to secure the Dolby CS128LF: •...
  • Page 19 Aiming the Dolby Speaker System 128 Figure 11: Adjust CS128MH horizontal axis Figure 12: Vertical and horizontal aiming guide 2. Aim the CS128MH toward the theater Reference Listening Position (RLP). If a laser pointer is used to assist in the horizontal aiming process: a.
  • Page 20 Assembling the Dolby Speaker System 128 Figure 13: Laser Pointer Positioning During Horizontal Aiming 3. Tighten the M10 bolts to 4 Nm (2.95 ft-lb, 35.4 in-lb), so the horizontal adjustment is locked in place. 4. Loosen the M10 vertical angle adjustment points on the side of the CS128MH and tilt the cabinet to aim the CS128MH toward the theater RLP.
  • Page 21 Aiming the Dolby Speaker System 128 Figure 14: Laser pointer positioning during vertical aiming Figure 15: M10 vertical adjustment pivot bolt and M5 set screw 5. Tighten the M10 bolts and M5 vertical aiming set screws to 4 Nm (2.95 ft-lb, 35.4 in-lb) so the vertical angle adjustment is locked in place.

  • Page 22: Working With Electrical Components

    Caution: Turn off all amplifiers when connecting loudspeaker wiring. 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 Dolby Speaker System 128 input plates, choosing between the two modes of operation, installing the wiring, and detailed information regarding speaker operating modes.
  • Page 23 5. Release the terminal tab, and the spring mount clamp will secure the wire. Figure 18: CS128MH input plate 6. Inspect the terminal for any stray wire strands, and then remove if any are found. Dolby Speaker System 128 Owner's Manual 8800293 Issue 2 27 October 2021...

  • Page 24: Connecting And Configuring The Cs128Lf

    Assembling the Dolby Speaker System 128 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.
  • Page 25 Refer to the figures in the wiring sections that follow. The Dolby Speaker System 128 always runs in bi-amplifier mode with the CS128MH and CS128LF requiring external amplifier processing for crossovers and gain settings. The CS128LF ships in parallel mode (single amplifier channel for both drivers) but can be changed such that an individual amplifier channel can be used for each 15 inch woofer.
  • Page 26 Assembling the Dolby Speaker System 128 Figure 22: Dolby Speaker System 128 bi-amp configuration The mid/high is an 8 ohm load to a single amplifier channel. Figure 23: Mid/high configuration The low-frequency parallel configuration is a 4 ohm load to a single amplifier channel.
  • Page 27 50 percent for the respective amplifier channel. In this configuration, the flip card should be oriented with the arrows pointing to the right. Dolby Speaker System 128 Owner's Manual 8800293 Issue 2 27 October 2021...
  • Page 28 Assembling the Dolby Speaker System 128 Figure 25: Low-frequency independent wiring Dolby Speaker System 128 Owner's Manual 8800293 Issue 2 27 October 2021...

  • Page 29: Dolby Speaker System 128 And System Components Specifications

    Dolby Speaker System 128 and system components specifications Dolby Speaker System 128 and system components specifications The specifications for the Dolby Speaker System 128 and for the system components are available. The list below is an outline of this chapter: •...

  • Page 30: Dolby Speaker System 128 Specifications

    Dolby Speaker System 128 and system components specifications 4.1 Dolby Speaker System 128 specifications The specifications for the Dolby Speaker System 128 are shown here: Table 1: Dolby Speaker System 128 specifications Specification Technical data Notes Frequency range 39 Hz - 20 kHz +3 dB/-6 dB in half-space conditions using required processing.

  • Page 31: Cs128Mh Specifications

    138 dB Measured peak SPL over five seconds meter at rated Vrms using 12 dB crest pink noise with required HPF. Dolby CS128MH weight 54 lb. (24.5 kg) Dolby Speaker System 128 Owner's Manual 8800293 Issue 2 27 October 2021...

  • Page 32: Cs128Lf Specifications

    Note: These specifications provide typical values and do not represent absolute limits. 4.4 Dolby Speaker System 128 and system components dimensions The dimensions of the Dolby Speaker System 128 and its components are described here. Dolby Speaker System 128 and components dimensions:...
  • Page 33 Dolby Speaker System 128 and system components dimensions Figure 26: Dolby Speaker System 128 and system components dimensions Figure 27: Dolby Speaker System 128 and system components dimensions Dolby Speaker System 128 Owner's Manual 8800293 Issue 2 27 October 2021...

  • Page 34: Dolby Speaker System 128 Digital Signal Processing Requirements

    Dolby Speaker System 128 digital signal processing requirements The Dolby Speaker System 128 digital signal processing is subject to a variety of requirements. The values in the requirements apply to both parallel and direct drives. The list below is an outline of this chapter: •...

  • Page 35: Cs128Mh Digital Signal Processing Requirements

    < +10 degrees, use a 0.5 msec delay. If the CS128MH vertical angle in yoke is ≥ +10 degrees, no delay is required. Dolby Speaker System 128 Owner's Manual 8800293 Issue 2 27 October 2021...
  • Page 36 Dolby Speaker System 128 digital signal processing requirements Table 8: CS128LF parametric equalization requirements EQ frequency Constant Q* Constant bandwidth EQ gain in dB 50Hz 2.87 Q 0.5 BW 0.67 120Hz 1.41 Q 1 BW 1.43 215Hz 0.71 BW 1.06 -4.5...

  • Page 37: System Limiters

    System limiters You can run the system limiters process with the required digital signal processing engaged. The list below is an outline of this chapter: • Setting system limiters Dolby Speaker System 128 Owner's Manual 8800293 Issue 2 27 October 2021...

  • Page 38: Setting System Limiters

    Caution: Loudspeaker damage as a result of exceeding the power handling specifications defined in Dolby Speaker System 128 and system components specifications is not covered under the warranty. Caution: Hearing damage can occur by prolonged exposure to excessive sound pressure level (SPL);...

  • Page 39: Documentation Revision History

    Documentation revision history Documentation revision history The documentation revision history lists the date, issue number, and description of all publications of Dolby Speaker System 128 Owner's Manual . Date Issue Description 31 August 2021 Issue 1 Initial release 27 October 2021...
  • Page 40 Dolby Laboratories, Inc. 1275 Market Street, San Francisco, CA 94103-1410 USA. 2021 Dolby Laboratories. All rights reserved. Dolby and the double-D symbol are registered trademarks of Dolby Laboratories. © All other trademarks remain the property of their respective owners.

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