Electronics / Speakers & Soundbars
Operating Manual for FBT MYRA 218S Subwoofer
Comprehensive operating manual for the FBT MYRA 218S line array subwoofer. Includes safety guidelines, rigging instructions, wiring diagrams, DSP preset requirements, and technical specifications.
Quick answers from the manual
Quick answer
- The FBT MYRA 218S is a passive 1-way subwoofer requiring processed amplification with FBT-validated DSP presets. It features a two-point rigging system and Neutrik NLT4MP connectors. p. 5, 8, 9
Key actions
- Rigging the subwoofer p. 7, 17
- Connecting the subwoofer p. 8, 18
Technical specifications
| Parameter | Value | Meaning | Pages |
|---|---|---|---|
| Frequency Response | 25Hz | Low frequency limit | p. 11, 21 |
| SPL Max | 143dB | Maximum sound pressure level | p. 11, 21 |
| Nominal Impedance | 4 Ohm | Electrical impedance | p. 11, 21 |
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Where to find it in the PDF
- Safety Precautions p. 4, 14
- Integrated Mechanics p. 7, 17
- Inputs & Outputs p. 8, 18
- Technical Specifications p. 11, 21
Table of contents
Manual images
Click an image to enlargeQuick Guide from the Manual
The FBT MYRA 218S is a high-performance, passive 1-way subwoofer designed for touring and fixed installations. Crucial: This system must be driven by processed amplifiers (with on-board DSP) configured with FBT-validated presets. Using the system without these presets is prohibited and may damage the internal components.
Safety Precautions
- Personal Injury: Never stand near loudspeakers operating at high levels to avoid hearing damage.
- Rigging Safety: Use only FBT-approved accessories. Ensure all rigging hardware is of appropriate size and load safety factor. Regularly check for signs of wear.
- Magnetic Fields: Loudspeakers produce static magnetic fields; keep them away from sensitive equipment during transport and assembly.
Integrated Mechanics and Rigging
The MYRA 218S features a two-point rigging system with retractable flanges on both sides of the cabinet. This allows for the suspension of up to 12 enclosures with a 4:1 safety factor. For detailed load calculations, use the FBT 'MYRA Rigging Safety Calculator' available on the FBT website.
Inputs and Outputs
The subwoofer is equipped with two Neutrik Speakon NLT4MP connectors (INPUT and OUTPUT). Note that the pins are not connected in parallel. The OUTPUT connector is intended for cascading a second MYRA 218S subwoofer. Use 4-wire cables for connections: 2.5mm² for lengths up to 10m, and 4mm² for lengths exceeding 10m.
DSP and Acoustic Simulation
To ensure optimal performance and system protection, you must use FBT-approved DSP presets. For acoustic planning, FBT recommends using the EASE FOCUS 3 software. You can download the .GLL library files for the MYRA system from the FBT website to use as sound sources within the simulation software.
System Components
- MR-F 218: Flybar for flown configurations.
- MR-T 218: Transport dolly for ground stack installation.
Technical Specifications
- Type: Passive 1-way subwoofer
- Frequency Response (@ -6dB): 25Hz
- Woofer: 2 x 18" neodymium, 4" voice coil
- Max SPL (cont/peak): 143dB
- Nominal Impedance: 4 Ohm
- Power Handling: 2000W (Long Term), 8000W (Short Term)
- Weight: 87.5 kg
Manufacturer information
FBT Elettronica SpA
Practical help
Common problems
System performance or reliability issues
Ensure you are using FBT-validated DSP presets. Using the system without specific presets is prohibited.
Impedance mismatch when linking
Linking two subwoofers via IN/OUT does not connect them in parallel. Use separate amplifier channels for each subwoofer.
Rigging safety concerns
Use only FBT-approved accessories and consult the 'MYRA SYSTEM RIGGING MANUAL' for load calculations.
Before use
- Verify the mounting surface is solid.
- Ensure all rigging hardware is FBT-approved.
- Check for signs of wear on accessories and load-bearing bolts.
- Use processed amplifiers with FBT-validated DSP presets.
- Ensure cables are of appropriate section (4x2.5mm² up to 10m, 4x4mm² over 10m).
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Specs in practice
- Frequency Response
- The range of frequencies the subwoofer can reproduce, starting from 25Hz.
- Nominal Impedance
- 4 Ohms per unit; critical for amplifier matching.
Images and diagrams
- The wiring diagram shows the Neutrik NLT4MP pinout for input and output.
- The rigging diagram illustrates the two-point suspension system.
Model compatibility
- Requires processed amplifiers with FBT-approved DSP presets.
- Compatible with MR-F 218 flybar and MR-T 218 transport cart.
Manual page author
Emily Carter
User documentation editor