TOA Line Array Speakers Instruction Manual

Introduction

Thank you for purchasing TOA's Line Array Speakers and their associated products. Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment.

Table of Contents

• 1. Safety Precautions
• 2. General Description
• 3. Features
• 4. Coverage Area
• 5. Dimensional Diagram
• 6. Single-Amplifier Drive and Bi-Amplifier Drive
• 7. Internal Wiring Diagram
• 8. Changing to High Impedance
• 9. Joining Speakers
• 10. Attaching the Protection Pad to the Speaker Edge
• 11. Changing Single-Amplifier Drive to Bi-Amplifier Drive System
• 12. Internal Wiring Diagram for the Bi-Amplifier Drive System
• 13. Digital Processor Filtering
• 14. Specifications

1. Safety Precautions

Safety Symbol and Message Conventions

Safety symbols and messages described below are used in this manual to prevent bodily injury and property damage which could result from mishandling. Before operating your product, read this manual first and understand the safety symbols and messages so you are thoroughly aware of the potential safety hazards.

⚠️ WARNING: Indicates a potentially hazardous situation which, if mishandled, could result in death or serious personal injury.

When Installing the Unit

• Avoid installing or mounting the unit in unstable locations, such as on a rickety table or a slanted surface. Doing so may result in the unit falling down and causing personal injury and/or property damage.
• Refer all installation work to the dealer from whom the speaker was purchased. Installation requires extensive technical knowledge and experience. The speaker may fall off if incorrectly installed, resulting in possible personal injury.
• Flying Precautions: Be sure to follow the instructions below. Otherwise, the suspension wires or belts may be off or snap and the speaker may fall off, causing personal injury.
• Check to confirm that the suspension wires and belts are strong enough to withstand the speaker load.
• The connectors of the suspension wires and belts must be securely linked with those of the speaker.
• All parts and components (such as enclosures, metal pieces, and screws) must be free from any deformation, crack, and corrosion.
• Be sure to use screws supplied with the optional flying hardware when installing the speaker using such hardware.
• Install the unit only in a location that can structurally support the weight of the unit and the mounting bracket. Doing otherwise may result in the unit falling down and causing personal injury and/or property damage.
• Owing to the unit's size and weight, be sure that at least two persons are available to install the unit. Failure to do so could result in personal injury.
• Do not use other methods than specified to install the speaker. Extreme force is applied to the unit and the unit could fall off, possibly resulting in personal injuries.
• Use nuts and bolts that are appropriate for the ceiling's or wall's structure and composition. Failure to do so may cause the speaker to fall, resulting in material damage and possible personal injury.
• Tighten each nut and bolt securely. Ensure that the bracket has no loose joints after installation to prevent accidents that could result in personal injury.
• Use the specified mounting bracket in combination. Doing otherwise may cause the unit or component to fall off, resulting in personal injury.
• Do not mount the unit in locations exposed to constant vibration. The mounting bracket can be damaged by excessive vibration, potentially causing the unit to fall, which could result in personal injury.

⚠️ CAUTION: Indicates a potentially hazardous situation which, if mishandled, could result in moderate or minor personal injury, and/or property damage.

When Installing the Unit

• Avoid placing the unit in a doorway or other high traffic area as people may trip on the equipment and cords, or be injured by falling objects.
• Avoid touching the unit's sharp metal edge to prevent injury.
• When installing the speaker at head height, attach the optional SR-PP4 Protection Pad to the bottom of the speaker. Failure to do so may cause injury if people hit their heads directly against the speaker.

When the Unit is in Use

• Do not operate the unit for an extended period of time with the sound distorting. This is an indication of a malfunction, which in turn can cause heat to generate and result in a fire.
• Do not stand or sit on, nor hang down from the unit as this may cause it to fall down or drop, resulting in personal injury and/or property damage.
• Have the unit checked periodically by the shop from where it was purchased. Failure to do so may result in corrosion or damage to the unit or its mounting bracket that could cause the unit to fall, possibly causing personal injury.

2. General Description

Featuring slim construction, the SR-S4 series are 2-way line array speakers containing 32 speaker elements. The sound source speaker elements are vertically arranged in close proximity to each other, and form a continuous linear sound source, achieving uniform sound pressure with less attenuation due to distance. The SR-S4L speaker is of a linear design which is ideal for long distance sound transmission applications, while the SR-S4S features a curved line having a 10° vertical coverage area, and is designed to cover relatively short distance applications. It is also possible to combine both the linear and curved line types to configure an array that continuously covers applications ranging from short to long distances.

3. Features

• The SR-S4 series is a 2-way line array speaker having eight 10 cm woofers for low-frequency output, and 24 small tweeters for high-frequency sound output. Both the woofers and tweeters are arranged in the front and rear on the same axis, providing a symmetrical, uniform coverage area.
• Since the linear sound source effect prevents energy from attenuating even at longer distances, the line array speaker compares favorably with normal types of speakers in its ability to project sound long distances. This realizes less difference in sound volume between areas close and far from the speaker, for a more uniform sound field.
• Since the speaker's vertical sound dispersion is suppressed, sound is only directed at the target area. The speaker's construction is not influenced by sound reflection from ceiling or floor surfaces, and can provide clear sounds even in spaces affected by long reverberation times or other poor acoustic conditions.
• Since the attenuation of sound pressure is small even far away from the speaker, the volume is not excessively loud in the area near the speaker. This helps suppress feedback (improving safety amplification gain).
• By joining 2 or 3 speakers, a longer sound source can be configured, making it possible to project sound output farther and at larger volumes.
• The speaker has a built-in network circuit for a single amplifier drive. Changing the internal connector position enables bi-amplifier drive that provides a higher quality sound output.
• The use of optional mounting brackets* permits the speaker to be installed in the most appropriate position for its intended use. (Details of the installation procedures are described in the installation manual enclosed with each bracket.) * SR-WB4 Wall mounting bracket, SR-TB4 Wall tilt bracket, SR-FB4 Flying bracket, SR-SA4 Stand adapter, and SR-FS4 Floor stand.
• The speaker can be used for high-impedance applications with the additional use of the optional MT-S0601 Matching transformer. (Single-amplifier drive only)

4. Coverage Area

The line array speaker radiates a sound only within a limited range. Since sound is reduced in areas that are outside the range, take care that the listening area is sufficiently covered when installing the speaker.

Correct installation examples

• [SR-S4L x 2]: Two SR-S4L speakers arranged vertically, covering a tiered audience.
• [SR-S4S]: A single SR-S4S speaker covering a tiered audience with its 10° vertical dispersion.
• [SR-S4L + SR-S4S]: A combination of SR-S4L and SR-S4S speakers configured to cover a tiered audience.

Incorrect installation examples

If the speaker is installed high above the floor facing horizontally or diagonally downward at a large angle, the listening area cannot be covered sufficiently.

• [SR-S4L]: An SR-S4L speaker installed too high, failing to cover the lower audience area.
• [SR-S4S]: An SR-S4S speaker installed too high, failing to cover the lower audience area.

5. Dimensional Diagram

5.1. Line Array Speaker SR-S4L

Front View: Width 160 mm, Height 895 mm.

Side View: Shows mounting hole dimensions: 255 mm total width, with 100 mm and 50 mm spacing from edges. Vertical mounting points are spaced at 60 mm intervals, with 30 mm margins from top and bottom.

Rear View: Features a blank panel (for optional MT-S0601 Matching Transformer) and an input terminal panel.

5.2. Line Array Speaker SR-S4S

Front View: Width 160 mm, Height 892 mm.

Side View: Shows mounting hole dimensions: 255 mm total width, with 100 mm and 50 mm spacing from edges. Vertical mounting points are spaced at 60 mm intervals, with 30 mm margins from top and bottom. A 10° angle is indicated, with a total width of 303 mm at the base.

Rear View: Features a blank panel (for optional MT-S0601 Matching Transformer) and an input terminal panel.

6. Single-Amplifier Drive and Bi-Amplifier Drive

The SR-S4 series speakers are factory-preset to be driven by a single amplifier, but this setting can be changed to a bi-amplifier drive system by altering the speaker's internal wiring (refer to page 12).

Single-amplifier drive

Note: Use a digital processor as required.

Diagram Description: A block diagram illustrates the signal path: Mixer/preamplifier → Digital processor → Power amplifier → Passive network → Woofers (x8) and Tweeters (x8).

Bi-amplifier drive

Diagram Description: A block diagram illustrates the signal path: Mixer/preamplifier → Digital processor → Power amplifier (LOW channel) → Woofers (x8) AND Power amplifier (HIGH channel) → Tweeters (x8).

7. Internal Wiring Diagram

When shipped from the factory, the speaker is internally connected as shown below.

Diagram Description: Shows internal wiring from screw terminals and Neutrik NL4MPXX connectors (INPUT +, INPUT -, THROUGH, THROUGH) to a passive network, which then connects to Woofers (x4) and Tweeters (x4).

Note: The Neutrik NL4MPXX connectors and screw terminals are internally connected in parallel, so either can be used for connection.

Neutrik NL4MPXX Connector Pinout:

8. Changing to High Impedance

The SR-S4 series speakers can be used for high-impedance applications with the installation of the optional MT-S0601 Matching Transformer. To install the transformer, remove the blank panel on the speaker's rear panel. Refer to the MT-S0601 instruction manual for mounting procedures.

Note: The speaker cannot be used with the matching transformer when driven by a bi-amplifier.

Rear Panel Diagram Description: Shows the rear panel of the SR-S4L/S4S speaker with the location of the blank panel to be removed for transformer installation.

To change the tap, refer to the instruction manual enclosed with the MT-S0601.

High Impedance Settings Table:

Diagram Description: Shows internal wiring when the matching transformer is installed, connecting screw terminals and Neutrik NL4MPXX connectors through the MT-S0601 matching transformer to the passive network, woofers (x4), and tweeters (x4).

9. Joining Speakers

Joining line array speakers configures a longer linear sound source, permitting richer low-frequency sound reproduction and higher sound output over a longer distance. Use the optional SR-EP4 Extension Plate to join speakers.

Joining procedure

1. Remove the (M5 oval-head) screws on both sides of the speaker. These removed screws are not used further.
2. Join 2 speakers using the SR-EP4 Extension plate. Fix the plate to the speaker using the hex head bolts supplied with the SR-EP4.

Diagram Description: Illustrates the joining procedure. Two speakers are shown. The SR-EP4 Extension plate is positioned between them. Hexagon head bolts (M5 x 20 with washer) are used to secure the plate to the speakers. A note indicates that the maximum number of speakers to be jointed is 3, when using 2 sets of SR-EP4.

Note: The screws removed in Step 1 are not used.

10. Attaching the Protection Pad to the Speaker Edge

⚠️ WARNING: When installing the speaker at head height, attach the optional SR-PP4 Protection Pad to the speaker edges. If people bump their heads directly against the corners or edges of the enclosure, injuries could result.

Remove the protective paper of the double-faced tape affixed to the SR-PP4 Protection Pad (optional) and attach the pad to the speaker edge as shown in the figure.

Diagram Description: Shows a speaker edge and the SR-PP4 Protection Pad with double-faced tape. An arrow indicates the pad being attached to the bottom edge of the speaker.

11. Changing Single-Amplifier Drive to Bi-Amplifier Drive System

The single-amplifier drive system can be changed to a bi-amplifier drive system by altering the speaker's internal wiring after removing the input terminal panel located at the back of the speaker.

How to change

1. Remove the 4 terminal panel mounting screws to detach the input terminal panel.
2. Carefully pull out the short length of wiring connected to the back of the input terminal panel.
3. Unplug 2 pairs of connected connectors, and reconnect them so that connections are made between labeled connectors and between unlabeled connectors.
4. Reattach the input terminal panel to the speaker using the 4 screws.
5. Affix the supplied label to the input terminal panel to change the indication.

Diagram Description: Illustrates the process. It shows the input terminal panel, the connector connection change (labeled connectors and unlabeled connectors being swapped), and the application of the Bi-amplifier drive input indication label and Bi-amplifier drive rating label.

12. Internal Wiring Diagram for the Bi-Amplifier Drive System

The diagram below shows the internal wiring after the speaker's drive system has been changed to a bi-amplifier system.

Diagram Description: Shows internal wiring from screw terminals (LOW +, LOW -, HIGH +, HIGH -) and Neutrik NL4MPXX connectors to Woofers (x4) and Tweeters (x4), with separate connections for LOW and HIGH frequencies.

Note: The Neutrik NL4MPXX connectors and screw terminals are internally connected in parallel, so either one can be used for connection.

Neutrik NL4MPXX Connector Pinout:

13. Digital Processor Filtering

13.1. Single-Amplifier Drive (Factory-Setting)

Although the speaker can be operated without a digital processor, it is recommended that the speaker be used in conjunction with a digital processor for better sound reproduction. Recommended setting parameters are as follows.

13.2. Bi-Amplifier Drive

Digital processing is required after the drive system has been changed to bi-amplifier operation. By inputting an optimum signal to the woofer and tweeter using the digital processor, a high sound quality output can be realized. Recommended setting parameters are as follows.

14. Specifications

14.1 Line Array Speaker SR-S4L, SR-S4S

Note: The design and specifications are subject to change without notice for improvement.

Accessories

• Bi-amplifier drive rating label ..................... 1
• Bi-amplifier drive input indication label ...... 1

Optional products

• Matching transformer: MT-S0601
• Extension plate: SR-EP4
• Flying bracket: SR-FB4
• Wall mounting bracket: SR-WB4 (Applicable to the SR-S4L only)
• Wall tilt bracket: SR-TB4
• Stand adapter: SR-SA4
• Protection pad: SR-PP4
• Floor stand: SR-FS4 (Applicable to the SR-S4L only)
• Digital speaker processor: DP-SP3

14.2. Extension Plate SR-EP4 (option)

The SR-EP4 is used to join multiple SR-S4L or SR-S4S speakers. One complete set consists of 2 brackets.

Note: The design and specifications are subject to change without notice for improvement.

Accessories

• Hexagon head bolt M5 x 20 with washer ......... 16

14.3. Protection Pad SR-PP4 (option)

When the SR-S4L or SR-S4S speaker is installed so that its bottom edge is located at head height, people could bump their heads directly against the speaker and suffer injuries. Affixing this protection pad to the speaker's bottom surface helps reduce the impact and chance of injury.

Note: The design and specifications are subject to change without notice for improvement.