MTSub 218a

High performance self-amplified touring 2×18″ subwoofer

TransducersLF : 2 x 18″
SPL peak / 1m (measured)140 dB
Weight91kg / 200.62lbs
RiggingPole mount socket
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MTSub 218a is a powerful, state-of-the-art self-powered subwoofer, designed to complement our FR-X and ARES series in touring, outdoor event, and theatre scenarios requiring excellent audio quality at a real-world price point.

The MTSub 218a subwoofer houses two long-excursion 18″ neodymium drivers in a bass-reflex design and delivers outstanding SPL in stand-alone or stacked configurations.

An advanced AUDIOFOCUS SCiO Class D amplifier module with integrated DSP and versatile presets allows MTSub 218a to be quickly deployed in any configuration, including cardioid and end-fire.

MTSub 218a is built with pride in Belgium and coated in tough, weather-resistant polyurea to safeguard your investment. The cabinet front is protected by a rigid metal grill, backed by acoustically transparent foam.


  • Cardioid / end fire setups
  • Compact format
  • Touring standard 2×18”
  • Pole mount socket
  • Self-powered

Technical specifications

DescriptionHigh-power subwoofer
Transducers LF: 2 x 18″
Frequency range (-6dB)38Hz-110 Hz
SPL peak (1)140 dB
ProcessingDedicated AUDIOFOCUS SCiO omni and cardioid presets
RiggingPole socket
Audio ConnectorsIN: 1×3-point XLR
LINK: 1×3-point XLR
Network Connectors1 x etherCON for control
Power ConnectorsIN: 1×3-point powerCON TRUE1TOP
LINK: 1×3-point powerCON TRUE1TOP
Dimensions (H x W x D)1200 x 605 x 800 mm
47.24 x 23.81 x 31.49 inches
Weight91kg / 200.62lbs
FinishHighly resistant polyurea coating

CabinetHigh grade birch plywood

(1) Peak level measured at 1 m under free field conditions using pink noise with crest factor 5

Gll files
MTSub 218a

Gll • 1.69 Mo • 06/01/2022

Quick Start guide
SCiO Web Connection

PDF • 250 Ko • 13/06/2023

User Manual

PDF • 6.50 Mo • 10/07/2023

Firmware update SCiO
+ Procedure guide

ZIP • 5.9 Mo • 09/04/2024
PDF • 143 Ko • 09/04/2024


Connect & Control your amplifiers

AUDIOFOCUS SCiO amplifiers can be securely monitored and controlled anytime, anywhere over the network.
Our intuitive Web UI network manager is web-based, eliminating the need for software downloads, and allows multiple amplifiers to be managed from your preferred device.

The network manager offers the comprehensive processing options you would expect from a high-end system controller.
For more detailed information please visit the AUDIOFOCUS SCiO page.


Note – this Quick Start Guide is for use with products manufactured from July 2022