Electronics / PA Systems
User Manual for FBT MUSE 218S Sound Reinforcement Subwoofer
Quick guide for the FBT MUSE 218S subwoofer. Learn about connection, wiring, technical specifications, and setup requirements for this professional sound reinforcement system.
Quick answers from the manual
Quick answer
- The MUSE 218S is a 1-way subwoofer system that requires an external DSP processor for operation, as it contains no internal crossover. It should be driven by an amplifier capable of 4000W RMS at 4 Ohms. p. 1, 3
Key actions
- Connect using a 4-wire Speakon cable, mapping amplifier channel 1 to 1+/1- and channel 2 to 2+/2-. p. 3
Problems and fixes
Suboptimal acoustic performance
Ensure correct DSP settings are applied via an external processor.
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Technical specifications
| Parameter | Value | Meaning | Pages |
|---|---|---|---|
| Recommended Amplifier Power | 4000W RMS | Recommended power at 4 Ohm. | p. 2 |
| Frequency Response | 30Hz | Frequency response @ -6dB. | p. 2 |
Where to find it in the PDF
- Product Overview p. 1
- Technical Specifications p. 2
- Connection Panel p. 3
- Dimensions and Accessories p. 4
Table of contents
Manual images
Click an image to enlargeQuick Guide
The FBT MUSE 218S is a professional ground-stack subwoofer designed for high-performance sound reinforcement. Important: This unit does not contain an internal crossover. You must use an external DSP processor to ensure optimal performance and transducer safety. Always use 4-wire Speakon cables for proper channel separation and connectivity.
Product Description
The MUSE 218S is a direct radiation ground subwoofer featuring two 18-inch (460mm) B&C long-excursion speakers with 4-inch voice coils. It is built with an 18mm birch plywood enclosure, scratch-resistant paint, and a heavy-duty metal grille. It is designed to extend and reinforce low frequencies, particularly for the MUSE 210 line array.
Connection and Wiring
The rear panel features two Neutrik NL4M Speakon female connectors (Input and Output). Because there is no internal crossover, the speakers are connected directly to these terminals.
- 4-Wire Configuration: Use a 4-wire Speakon cable between the amplifier and the first speaker. Connect amplifier output channel 1 to terminals 1+/1- and channel 2 to terminals 2+/2-.
- Linking Speakers: When linking multiple speakers, use 4-pole Speakon cables. Note that speakers 1 and 3 will be connected in parallel, as will speakers 2 and 4. Ensure your amplifier is capable of driving the resulting impedance.
- Cable Recommendations: Use 2.5mm² cable for lengths up to 20 meters, and 4mm² cable for lengths exceeding 20 meters.
Technical Specifications
The system is designed for high-output applications with the following key parameters:
- Frequency Response: 30Hz @ -6dB (preset dependent).
- Recommended Amplifier Power: 4000W RMS @ 4 Ohm.
- SPL Max: 148.5dB (peak).
- Nominal Impedance: 4 Ohm.
- Input Connectors: 2 x Speakon NL4M (in & out).
Accessories
Optional accessories are available to facilitate installation and transport:
- MS-F210 Flybar: Used for configuring the subwoofer in arrays or for ground-stacking satellites.
- KBW-10045: A 4-wheel kit with brakes (100mm diameter) for easier mobility.
Manufacturer information
FBT Elettronica SpA
Practical help
Common problems
No sound or poor acoustic performance
Ensure an external DSP processor is used. The subwoofer has no internal crossover and requires external processing.
Incorrect channel routing
Verify that you are using a 4-wire Speakon cable and that the amplifier channels are correctly mapped to terminals 1+/1- and 2+/2-.
Before use
- Verify amplifier power is 4000W RMS @ 4 Ohm.
- Ensure an external DSP processor is connected and configured.
- Use 4-wire Speakon cables for proper signal routing.
- Check cable gauge: 2.5mm² for 20m.
- Ensure the surface is stable for ground-stacking.
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Specs in practice
- Frequency Response
- 30Hz @ -6dB (preset dependent).
- Nominal Impedance
- 4 Ohm.
Images and diagrams
- The connection panel diagram illustrates the pinout for the Speakon NL4M connectors.
- Wiring diagrams show how to connect multiple cabinets in parallel using 4-pole cables.
Model compatibility
- Designed for use with MUSE 210 line array systems.
- Requires external DSP processor for operation.
Manual page author
Michael Turner
Technical manual editor