Martin Audio X115B – Professional Compact 15” Subwoofer

Introduction

The Martin Audio X115B is a high-performance 15-inch passive subwoofer designed for professional live sound reinforcement, portable PA systems, clubs, and fixed installations. It is part of the Blackline X series, known for combining compact design with high-output sound performance and rugged touring reliability.

Engineered by Martin Audio, the X115B is designed to extend low-frequency response for full-range loudspeakers, delivering tight, controlled bass with high efficiency and strong SPL output.

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Core Design: Direct Radiating Subwoofer

The X115B uses a direct-radiating bass reflex design, meaning the driver works in combination with tuned ports to enhance low-frequency output.

It includes:

• 1 × 15-inch long-excursion LF driver
• 3-inch (75mm) voice coil for high power handling
• Ferrite magnet motor system
• Bass reflex enclosure with tuned ports

This design ensures a balance between deep bass extension and fast transient response, making it suitable for both music playback and live performance reinforcement.

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Acoustic Performance & Frequency Response

The X115B is engineered for strong low-frequency performance with controlled response.

Key acoustic specifications:

• Frequency response: 45Hz – 150Hz (±3dB)
• Low-frequency extension: down to 40Hz (-10dB)
• Sensitivity: 102dB (1W/1m)
• Maximum SPL: up to 129dB continuous / 135dB peak
• Nominal impedance: 8 ohms

The high sensitivity allows the subwoofer to produce very high output levels with relatively moderate amplifier power.

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Power Handling & Efficiency

The X115B is designed for professional amplification systems.

Power ratings:

• 500W AES continuous power handling
• 2000W peak power handling capability

This allows the subwoofer to operate reliably under demanding conditions, including long-duration events and high-SPL environments such as clubs and live concerts.

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Bass Character & Sound Performance

The X115B is tuned for:

• Tight and punchy bass response
• Strong mid-bass impact for kick drums
• Controlled low-frequency extension
• Reduced distortion at high output levels

Its sound character makes it especially suitable for:

• DJ systems
• Live band reinforcement
• Corporate event audio
• Medium-sized venues

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Dispersion & Acoustic Behavior

As a subwoofer, the X115B operates in an omnidirectional low-frequency pattern, meaning bass is distributed evenly across the space.

This ensures:

• Consistent bass coverage throughout the venue
• Smooth integration with full-range loudspeakers
• Flexible placement options (stacking or single use)

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Cabinet Design & Build Quality

The enclosure is built for professional touring and installation use.

Construction features:

• Birch/poplar plywood cabinet
• Heavy-duty black textured finish
• Steel perforated grille for driver protection
• Integrated handles for transport
• Pole-mount socket for top speaker mounting
• M10 flying points for installation use
• Stackable design for array configurations

This robust design ensures durability under frequent transport and installation cycles.

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Connectivity & Integration

The X115B uses professional-grade connectivity:

• 3 × NL4 (Speakon) connectors
• Parallel input and link configuration
• Passive operation (requires external amplifier + DSP)

It is typically used with dedicated system amplifiers or DSP-managed rigs for optimal performance and system tuning.

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System Integration

The X115B is commonly paired with:

• Full-range Martin Audio Blackline X series speakers
• External DSP amplifiers (Martin Audio MA series or equivalent)
• Active crossover systems set between 80–120Hz

This ensures optimal frequency distribution and system balance.

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Technical Specifications

• Product Type: Passive Direct-Radiating Subwoofer
• Driver: 1 × 15” LF driver (3” voice coil)
• Power Handling: 500W AES / 2000W peak
• Impedance: 8 ohms
• Frequency Response: 45Hz – 150Hz (±3dB)
• Low Extension: 40Hz (-10dB)
• Sensitivity: 102dB (1W/1m)
• Maximum SPL: 129dB continuous / 135dB peak
• Dispersion: Omnidirectional
• Enclosure: Bass reflex, plywood construction
• Finish: Black textured paint
• Connectors: 3 × NL4 Speakon
• Mounting: M10 inserts + pole mount socket
• Weight: ~27 kg

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Use Cases

The Martin Audio X115B is ideal for:

• DJ sound systems
• Live concerts and bands
• Clubs and entertainment venues
• Corporate AV events
• Portable PA systems
• Houses of worship
• Medium-sized installed sound systems

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Why It Stands Out

The X115B stands out due to:

• High sensitivity (102dB) for efficient output
• Strong 135dB peak SPL capability
• Compact 15-inch design with deep bass response
• Rugged touring-grade construction
• Easy integration with professional DSP systems

It delivers professional low-frequency performance without requiring extremely high amplifier power.

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Conclusion

The Martin Audio X115B is a compact yet powerful 15-inch passive subwoofer designed for professional audio applications. With its 500W AES power handling, high 135dB peak SPL, and efficient bass reflex design, it delivers tight, controlled, and impactful low-frequency performance suitable for live sound, DJ setups, and installed systems. Built for durability and consistent output, it is a reliable choice for demanding professional environments.