Martin Audio BlacklineX X115B – 15" Passive Portable Subwoofer

Product Overview

The Martin Audio BlacklineX X115B is a compact 15" passive portable subwoofer engineered to extend the low-frequency performance of BlacklineX Series full-range loudspeakers in live sound reinforcement, rental, and installation applications. Built around a long-excursion 15" driver with a 3" (75mm) voice coil in a bass reflex enclosure with four large ports, the X115B delivers tight, high-output bass with reduced air turbulence noise at high output levels. It is designed to be used singly, stacked in multiples, or flown via integral M10 inserts, providing the deployment flexibility required across rental, touring, and permanent installation contexts. A 35mm pole-mount socket on the top surface allows X10B, X12B, or X15B full-range cabinets to be mounted directly over the X115B for compact satellite-over-subwoofer ground-stack configurations.

Product Description

The Martin Audio BlacklineX X115B is the entry-level subwoofer in the BlacklineX Series, positioned as the standard subwoofer companion to the X10B, X12B, and X15B full-range passive loudspeakers. It addresses the need for a compact, high-output portable subwoofer that can augment low-frequency performance without requiring a large physical footprint.

The driver is a long-excursion 15" (380mm) unit with a 3" (75mm) voice coil, housed in a plywood bass reflex enclosure. Four large reflex ports are integrated into the enclosure design to minimize air noise at high output levels, which is particularly important in live music environments where sub-bass distortion and port chuffing detract from audio quality.

The X115B can be deployed as a standalone single subwoofer, stacked in multiples for increased low-frequency output, or suspended via M10 flying inserts for flown PA configurations in larger venues. Rubber feet on the enclosure base resist movement and align with recesses on the top surface, enabling stable stacking of multiple X115B units or positioning a full-range satellite cabinet on top.

A 35mm pole-mount socket on the top surface supports satellite cabinet mounting in a portable PA configuration. The enclosure is fitted with two side handles for ease of transport and protected by an impact-resistant perforated steel grille over the driver. When used with BlacklineX full-range systems, crossover and EQ functions are handled by the Martin Audio DX0.5 system controller or compatible iKON amplifiers. Find the full BlacklineX range at Creation Networks.

Key Features

• 15" Long-Excursion Driver — 3" (75mm) voice coil provides high power handling and deep bass extension for live sound reinforcement applications.
• Four Large Reflex Ports — Large port area reduces air turbulence noise at high output levels for cleaner bass reproduction.
• M10 Flying Inserts — Integral suspension hardware supports flown PA configurations in venues with rigging infrastructure.
• 35mm Pole-Mount Socket — Top-surface pole mount accommodates BlacklineX satellite loudspeakers in ground-stack configurations.
• Stackable Enclosure Design — Rubber feet and top-surface recesses enable stable horizontal stacking of multiple X115B units.
• 8Ω Nominal Impedance — Broad compatibility with professional power amplifiers in rental and installation inventories.
• Plywood Construction — Black textured paint finish with impact-resistant perforated steel grille for rental-grade durability.
• Dual Side Handles — Ergonomic carry handles facilitate safe two-person transport of the enclosure.

Typical Applications

• Live Event Rental — Compact footprint and durable plywood construction suit a high-turnover rental inventory used across multiple event types.
• Portable PA Systems — Ground-stack satellite-over-subwoofer configuration with BlacklineX full-range cabinets for portable live event PA.
• Live Music Clubs and Nightclubs — High-output 15" subwoofer delivers dance-floor sub-bass performance without requiring the footprint of a larger cabinet.
• House of Worship — Low-frequency extension for worship band reinforcement in sanctuaries and multi-purpose rooms where sub-bass impact supports congregational music.
• Corporate AV and Conferences — Low-frequency support for portable PA systems in ballrooms and large conference spaces.
• Festival Secondary Stages — Stackable and flyable deployment options support compact subwoofer arrays on secondary and side stages.
• Auditoriums and Multi-Purpose Rooms — Semi-permanent subwoofer installation where a compact 15" unit provides adequate low-frequency reinforcement for the room volume.

Technical Specifications

Frequently Asked Questions

Which full-range loudspeakers pair with the X115B?

The X115B is designed to work with BlacklineX Series full-range cabinets including the X10B (10"), X12B (12"), and X15B (15"). Crossover and EQ alignment between the subwoofer and full-range satellite is handled via the Martin Audio DX0.5 system controller or compatible iKON amplifiers. Browse the full BlacklineX range at creationnetworks.net.

Can the X115B be flown?

Yes. The X115B features integral M10 flying inserts that allow it to be suspended in flown PA configurations when used in venues with appropriate rigging infrastructure and certified rigging hardware. Always follow manufacturer rigging guidelines and local safety regulations.

How many X115B units can be stacked?

The rubber feet and top-surface recesses on the X115B enclosure allow stable horizontal stacking of multiple units. The appropriate number of stacked cabinets depends on the venue size, required SPL, and amplifier availability. Consult a Martin Audio system designer or Creation Networks for system configuration guidance.

Does the X115B require a DSP controller?

A controller is strongly recommended when integrating the X115B with BlacklineX full-range loudspeakers. The Martin Audio DX0.5 system controller manages crossover frequency, EQ optimization, and driver limiting. Without a controller, the system operates without active crossover or frequency protection for the subwoofer driver.

What amplifier is recommended for the X115B?

The X115B presents an 8Ω nominal impedance. Select a professional power amplifier with output power matched to the cabinet's rated continuous and peak power handling as specified in the Martin Audio X115B data sheet. Compatible iKON amplifiers provide integrated DSP management for the subwoofer-satellite system.

Can a satellite speaker be mounted on top of the X115B?

Yes. The 35mm pole-mount socket on the top surface of the X115B accommodates a speaker pole, allowing X10B, X12B, or X15B satellite cabinets to be mounted directly above the subwoofer in a standard ground-stack configuration.

Is the X115B suitable for permanent installation?

Yes. M10 flying inserts allow the X115B to be used in semi-permanent and permanent flown configurations. For ground-level installation, the stackable design and rubber feet provide stable placement without additional hardware.