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Speakers
MTD115b
Operator's manual
L-Acoustics MTD115b Operator's Manual
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Contents
Table of Contents
Bookmarks
Table of Contents
Foreword
Manual Organization
Table of Contents
List of Figures
List of Tables
Introduction
1 The Mtd System
Mtd System Components
Figure 1: MTD System Components
Figure 2: MTD LLC Controllers
Mtd Overview
Mtd108A SPECIFICATIONS
Figure 3: Mtd108A Passive 2-Way (8" LF + 1" HF) Coaxial Loudspeaker
Mtd112B SPECIFICATIONS
Figure 4: Mtd112B Passive 2-Way (12" LF + 1.4" HF) Coaxial Loudspeaker
Mtd115B SPECIFICATIONS
Figure 5: Mtd115B Active/Passive 2-Way (15" LF + 1.4" HF) Coaxial Loudspeaker
2 Powering Mtd
Figure 6: MLS Switches on the Rear Panel of L-ACOUSTICS La24A, La48A Amplifiers
POWERING Mtd108A
Table 1: Load and Power Ratings for Mtd108A
Table 2: Recommended Power Amplification and MLS Switch Settings for Mtd108A
Table 3: Recommended MLS Switch Settings for Powering Mtd108A
POWERING Mtd112B
Table 4: Load and Power Ratings for Mtd112B
Table 5: Recommended Power Amplification and MLS Switch Settings for Mtd112B
Table 6: Recommended MLS Switch Settings for Powering Mtd112B
POWERING Mtd115B (PASSIVE MODE)
Table 7: Load and Power Ratings for Mtd115B (Passive Mode)
Table 8: Recommended Power Amplification, MLS Switch Settings for Mtd115B (Passive Mode)
Table 9: Recommended MLS Switch Settings for Powering Mtd115B (Passive Mode)
POWERING Mtd115B (ACTIVE MODE)
Table 10: Load and Power Ratings for Mtd115B (Active Mode)
Table 11: Recommended Power Amplification and MLS Switch Settings for Mtd115B Low Section
Table 12: Recommended Power Amplification and MLS Switch Settings for Mtd115B High Section
Table 13: Recommended MLS Switch Settings for Powering Mtd115B (Active Mode)
Table 14: Output Power Ratings and MLS Switch Settings for L-ACOUSTICS Laa Amplifiers
Connectors and Cables
Table 15: Maximum Recommended Length for Damping Factor > 20
3 Processing Mtd
L-ACOUSTICS MTD108 Llca DESCRIPTION
L-ACOUSTICS LLC 112B-St DESCRIPTION
L-ACOUSTICS LLC 115B-St, Llc115B-2W DESCRIPTION
4 Mtd Configurations
Mtd108A FLOOR MONITOR SYSTEM
Figure 7A: Mtd108A Floor Monitor System Block Diagram
Figure 7B: Mtd108A Floor Monitor System Cabling Detail
Mtd108A FOH SYSTEM (MONO SUBS)
Figure 8A: Mtd108A FOH System Block Diagram (Mono Subwoofers)
Figure 8B: Mtd108A FOH System Cabling Detail (Mono Subwoofers)
Mtd108A FOH SYSTEM (STEREO SUBS)
Figure 9A: Mtd108A FOH System Block Diagram (Stereo Subwoofers)
Figure 9B: Mtd108A FOH System Cabling Detail (Stereo Subwoofers)
Mtd112B FLOOR MONITOR SYSTEM
Figure 10A: Mtd112B Floor Monitor System Block Diagram
Figure 10B: Mtd112B Floor Monitor System Cabling Detail
Mtd112B FOH SYSTEM (MONO SUB)
Figure 11A: Mtd112B FOH System Block Diagram (Mono Subwoofers)
Figure 11B: Mtd112B FOH System Cabling Detail (Mono Subwoofers)
Mtd112B FOH SYSTEM (STEREO SUBS)
Figure 12A: Mtd112B FOH System Block Diagram (Stereo Subwoofers)
Figure 12B: Mtd112B FOH System Cabling Detail (Stereo Subwoofers)
Mtd115B (PASSIVE) FLOOR MONITOR SYSTEM
Figure 13A: Mtd115B (Passive) Floor Monitor System Block Diagram
Figure 13B: Mtd115B (Passive) Floor Monitor System Cabling Detail
Mtd115B (PASSIVE) FOH SYSTEM (MONO SUB)
Figure 14A: Mtd115B (Passive) FOH System Block Diagram (Mono Subwoofers)
Figure 14B: Mtd115B (Passive) FOH System Cabling Detail (Mono Subwoofers)
Mtd115B (PASSIVE) FOH SYSTEM (STEREO SUBS)
Figure 15A: Mtd115B (Passive) FOH System Block Diagram (Stereo Subwoofers)
Figure 15B: Mtd112B (Passive) FOH System Cabling Detail (Stereo Subwoofers)
Mtd115B (ACTIVE) FLOOR MONITOR SYSTEM
Figure 16A: Mtd115B (Active) Floor Monitor System Block Diagram
Figure 16B: Mtd115B (Active) Floor Monitor System Cabling Detail
Mtd115B (ACTIVE) FOH SYSTEM (STEREO SB118 SUBS)
Figure 17A: Mtd115B (Active) FOH System Block Diagram (Mono Subwoofers)
Figure 17B: Mtd115B (Active) FOH System Cabling Detail (Mono Subwoofers)
Mtd115B (ACTIVE) FOH SYSTEM (STEREO SB218 SUBS)
Figure 18A: Mtd115B (Active) FOH System Block Diagram (Stereo Subwoofers)
Figure 18B: Mtd112B (Active) FOH System Cabling Detail (Stereo Subwoofers)
5 Sound Design
Applications
Aiming Mtd Enclosures
Arraying Mtd Enclosures
Figure 19: General Guidelines for Aiming MTD Enclosures
Figure 20: SPL Mappings at Octave Band Frequencies for a Single MTD Enclosure
Figure 21: SPL Mappings for Two MTD Enclosures with 0.5 Metre Spacing
Figure 22: SPL Mappings for Two MTD Enclosures with 3 Metre Spacing
Figure 23: General Guidelines for Arraying MTD Enclosures
Figure 24: SPL Mappings for Four MTD Enclosures with 0.5 Metre Spacing
Predicting Mtd Coverage
Distributed Sound Reinforcement
Overhead Distributed Systems
Delay Systems
Complementary Fill
Front-Of-House (Foh) Applications
Stage Monitoring
Table 16: Nominal Floor Monitor Distance (to Performer) and Separation Versus Performer Height
Using Mtd with Subwoofers
Figure 25: L-ACOUSTICS Subwoofer Continuous Unweighted SPL Comparison
Table 17: L-ACOUSTICS Subwoofer Specification Summary
Combining Mtd with Subwoofers
Ground Stacked Systems
Figure 26: Illustration of Subwoofer Time Alignment
Separate Flown Mtd with Ground Stacked Subwoofers
6 Installation Procedures
ETR8 U-BRACKET ATTACHMENT(Mtd108A)
Figure 27: ETR8 U-Bracket Installation Procedure
ETR1, ETR2 U-BRACKET ATTACHMENT (Mtd112B, Mtd115B)
Figure 28: ETR1, ETR2 U-Bracket Installation Procedure
OMNIMOUNT BRACKET ATTACHMENT (Mtd112B, Mtd115B)
Safety Rules
Figure 29: Omnimount Installation Procedure
7 Mtd System Operation
Recommended Maintenance Procedures
Spare Parts
8 Specifications
Mtd108A SPECIFICATIONS
Figure 30: Mtd108A Line Drawing
Figure 31: Mtd108A Plus ETR8 Line Drawings
Mtd108Llca SPECIFICATIONS
Mtd112B SPECIFICATIONS
Figure 32: Mtd112B Line Drawing
Figure 33: Mtd112B Plus ETR1 Line Drawings
Llc112B-St SPECIFICATIONS
Mtd115B SPECIFICATIONS
Figure 34: Mtd115B Line Drawing
Figure 35: Mtd115B Plus ETR2 Line Drawings
Llc115B-St, Llc115B-2W SPECIFICATIONS
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Version 1.2
December 2004
L-ACOUSTICS MTD LINE
MTD108a, MTD112b, MTD115b
OPERATOR MANUAL
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Summarization of Contents
FOREWORD
MANUAL ORGANIZATION
Overview of the manual's structure and chapter contents.
INTRODUCTION
MTD System Overview
Introduction to the MTD line, its coaxial technology, and applications.
MTD SYSTEM COMPONENTS
Loudspeaker Enclosures
Details on MTD108a, MTD112b, and MTD115b loudspeaker models.
Subwoofer Enclosures
Information on SB115, SB118, and SB218 subwoofer models.
POWERING MTD
MTD108a Powering
Recommended amplifier specifications and settings for the MTD108a.
MTD112b Powering
Recommended amplifier specifications and settings for the MTD112b.
MTD115b Powering (Passive/Active)
Amplifier recommendations for MTD115b in passive and active configurations.
CONNECTORS AND CABLES
Cable Usage Guidelines
Details on loudspeaker cable types, cross-sections, and lengths for optimal performance.
PROCESSING MTD
MTD108 LLCa Controller
Functions and features of the analog line level controller for MTD108a.
MTD112b LLC Controller
Functions and features of the analog line level controller for MTD112b.
MTD115b LLC Controllers
Controller descriptions for MTD115b passive and active modes.
MTD CONFIGURATIONS
MTD108a System Examples
Block diagrams and cabling for MTD108a floor monitor and FOH systems.
MTD112b System Examples
Block diagrams and cabling for MTD112b floor monitor and FOH systems.
MTD115b Passive System Examples
Configurations for MTD115b (passive) floor monitor and FOH systems.
MTD115b Active System Examples
Configurations for MTD115b (active) floor monitor and FOH systems.
SOUND DESIGN
Applications Overview
Overview of typical applications for MTD loudspeakers.
Aiming and Arraying
Guidelines for aiming and arranging MTD enclosures for optimal coverage.
Coverage Prediction
Using polar data files and software for modeling MTD loudspeaker coverage patterns.
Distributed Sound Reinforcement
Strategies for achieving even SPL and frequency response using MTD systems.
FOH and Stage Monitoring
Using MTD for FOH and as high-performance stage monitors.
Using MTD With Subwoofers
Integrating MTD loudspeakers with various L-ACOUSTICS subwoofers for extended bandwidth.
INSTALLATION PROCEDURES
U-Bracket Installation
Guides for attaching ETR8, ETRI, ETR2 U-brackets to MTD enclosures.
Omnimount Attachment
Procedure for mounting MTD112b and MTD115b enclosures using Omnimount adapters.
Safety Rules
Essential safety guidelines for installing and rigging MTD enclosures.
MTD SYSTEM OPERATION
Maintenance Procedures
Guidelines for maintaining MTD loudspeakers, including diaphragm replacement.
Spare Parts
List of available spare parts for MTD enclosures and controllers.
SPECIFICATIONS
MTD108a Specifications
Technical specifications for the MTD108a loudspeaker enclosure.
MTD108 LLCa Specifications
Technical specifications for the MTD108 LLCa analog line level controller.
MTD112b Specifications
Technical specifications for the MTD112b loudspeaker enclosure.
LLC112b-st Specifications
Technical specifications for the LLC112b-st analog line level controller.
MTD115b Specifications
Technical specifications for the MTD115b loudspeaker enclosure (passive/active).
LLC115b-st, LLC115b-2w Specifications
Technical specifications for the LLC115b-st/LLC115b-2w controllers.
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