Sub Martin Audio SX115

The Martin Audio SX115 is a 15-inch subwoofer designed to deliver deep, powerful, and accurate bass for professional audio systems. With a 15” driver and 3200W peak power, the SX115 delivers impressive low-frequency reproduction, making it ideal for stages, clubs, bars, or portable PA systems.

Introducing the Martin Audio SX115 Subwoofer

Martin Audio SX115 is a 15-inch subwoofer speaker from the famous SX Series of the British brand Martin Audio. With a peak power of up to 3200W, a sensitivity of 100dB and the ability to reproduce deep bass down to 36Hz, the SX115 delivers powerful, compact and powerful bass. The direct radiating design provides realistic sound, suitable for stages, bars, clubs, halls, or professional sound systems that require high performance and outstanding durability.

Technical parameters of the product to consider:

• Speaker Type: Direct Radiating Subwoofer: The direct radiation design provides fast, clean bass output without phase delay, reproducing low frequencies with high accuracy. This design is commonly found in professional PA systems where fast response and low distortion are required.
• Speaker: 15 inch, 4 inch voice coil, Ferrite magnet: The 15” speaker provides a large radiation area, creating strong sound pressure. The 4” voice coil ensures high heat resistance, helping to operate stably at high power. The Ferrite magnet provides magnetic stability and high durability, with little loss of magnetic force over time.
• Frequency range (4π): 45Hz – 100Hz (±3dB), -10dB at 36Hz: The Martin Audio SX115 Sub can reproduce bass as deep as 36Hz, enough to fully express the energy of drums, kick bass or synth sub in EDM, Pop, Rock music. The narrow ±3dB range shows very good acoustic linearity, the sound is not distorted or bass-boosted.
• Cutoff frequency: 100Hz: This is the ideal crossover point for pairing with full-range or line array speakers. The 100Hz crossover frequency allows the bass to blend smoothly with the mid-low, creating a continuous and natural frequency range.
• Sensitivity: 100dB (2.83V/1m, half-space): High sensitivity means optimum audio performance – low input power is needed to achieve high volume levels. This saves power and reduces amplifier stress.
• Nominal Power: 800W AES / 3200W Peak: With an average power of 800W, the Martin Audio SX115 can operate continuously for many hours without losing performance. The peak power of 3200W provides the ability to handle large volumes, serving the stage or medium-large scale club.
• Nominal impedance: 8Ω: Universal impedance standard, easy to match with high power amplifiers or Martin Audio DSP amplifier modules. High compatibility, can run multiple speakers in parallel in the system.
• Maximum sound pressure level (SPL): 130dB continuous / 136dB peak / 142dB peak (12dB): This is an impressive SPL for a 15-inch sub, allowing the SX115 to reach powerful volumes while remaining clean and well-controlled in terms of distortion. Perfect for live performances, EDM, or array systems.
• Coverage angle & operating mode: Omni-directional: Suitable for single or symmetrical placement on stage.
• Cardioid (radial) when paired: Allows control of bass direction, reduces resonance behind the stage, optimizing sound for the audience.
• Connection ports: 2 x NL4 SpeakON (1+/-, 2+/-): Specialized industrial connection standard, easily links multiple subwoofers in a chain, ensuring stable and safe signal transmission when operating at high power.
• Overall dimensions: Width 500mm x Height 451mm x Depth 678mm (806mm with wheels attached): Compact design makes it easy to position in performance spaces, especially when traveling by roadcase.
• Weight: 36.5kg (80.5lbs): Reasonable weight with high capacity 15 inch sub, convenient for touring, installation and moving.

Outstanding features of Martin Audio SX115 Karaoke Subwoofer

Martin Audio SX115 is a 15-inch subwoofer line with professional British audio technology, designed to deliver strong, clean and well-controlled bass in any performance space. Not only is it a high-power sub, the SX115 is also the power center that helps the entire sound system become more lively and powerful.

• Deep, powerful and precise bass: Martin Audio SX115 reproduces low-range sound from 45Hz down to 36Hz (-10dB), giving a full, deep and powerful bass feeling. Direct Radiating technology allows the bass to come out quickly, neatly, without being muddy or delayed, ensuring the sub sound is always clear even at high volume levels.
• Huge power, impressive SPL performance: With a rated power of 800W AES and a peak power of 3200W, the Martin Audio SX115 easily reaches a maximum SPL of up to 142dB. This helps the product operate powerfully, stably, and maintain high volume without distortion (Low THD) - an extremely important criterion in karaoke sound systems, live shows or clubs.
• High-end speaker structure – outstanding durability: The SX115 is equipped with a 15” driver with a 4-inch voice coil and a Ferrite magnet. This structure helps: Increase heat resistance and long-term load resistance, reduce sound distortion when operating at high power range, ensure long-term service life, suitable for continuous use in professional environments.
• Acoustically optimized speaker cabinet design: The Martin Audio SX115 speaker cabinet is crafted from thick MDF wood, coated with anti-scratch polyurethane paint, which effectively prevents resonance and moisture. The cabinet's interior is optimized using FEA (Finite Element Analysis) simulation to achieve precise phase balance and acoustic response, for tight, deep and clean bass.
• Flexible in layout and configuration: The SX115 can operate in two modes: Omni-directional: when used alone, evenly covers bass in all directions. Cardioid: when paired, helps control the direction of sound, reducing bass reverberation behind the stage.
• Easy to combine and expand the system: Equipped with 2 NL4 SpeakON ports (1+/-, 2+/-), SX115 supports linking multiple subwoofers in the same system or connecting directly to full-range speakers such as Martin Audio Blackline X12, TORUS T1215. This helps users easily expand the configuration, from high-end karaoke systems to professional stage sound systems.
• Compact design, easy to move: With dimensions of 500 x 451 x 678mm (806mm with wheels) and a weight of 36.5kg, the Martin Audio SX115 is easy to transport, install and maintain. This is a big advantage compared to heavy 18-inch subwoofers, helping technicians set up faster and save installation space.

Detailed review of Martin Audio SX115 Subwoofer

Bass Quality – Deep, solid and well controlled

The Martin Audio SX115 subwoofer reproduces low frequencies from 45Hz down to 36Hz (-10dB), creating a deep and powerful bass base. Thanks to the Direct Radiating design, sound is transmitted quickly, neatly and accurately, limiting the phase delay phenomenon commonly found in conventional sub bass lines.

When tested in a karaoke or stage space, the Martin Audio SX115 delivers clear, focused, and powerful bass, allowing listeners to feel the true energy of bass instruments or kick drums. The bass is not “buzzing” or “rumbling,” but delivers a refined, detailed sound – true to the British acoustic style.

Power performance – Powerful and long lasting

With a rated power of 800W AES and a peak power of up to 3200W, the Martin Audio SX115 is capable of continuous operation at high intensity levels without distortion or performance loss. Sensitivity of 100dB (2.83V/1m) allows the speaker to easily reach high volume levels even when using a moderate power amplifier.

In high-end karaoke performances or systems, the SX115 can maintain a maximum sound pressure level of 142dB peak SPL, providing a vivid bass experience that spreads evenly throughout the space. The 4-inch voice coil system and optimized heat dissipation slots help the speaker operate stably, cool and durable for a long time.

Speaker and cabinet design – Outstanding acoustics and durability

The speaker structure of Martin Audio SX115 is built with a 15-inch driver using Ferrite magnets, providing stable magnetism and high load capacity. The 4-inch diameter voice coil is wound with heat-resistant copper wire, ensuring continuous operation without performance degradation.

The speaker cabinet is made of high-quality MDF wood covered with scratch-resistant and moisture-resistant polyurethane paint, which increases physical durability as well as limits acoustic resonance. The entire cabinet is simulated using FEA (Finite Element Analysis) software to optimize sound dispersion, providing clean, strong and accurate bass. This is the factor that helps the SX115 not only be mechanically durable but also acoustically stable after many years of use.

Mix and match capabilities – Flexible in any configuration

The Martin Audio SX115 is designed to work well in both karaoke systems and professional performance stages. The speaker supports 2 NL4 SpeakON connection ports (1+/-, 2+/-), allowing parallel connection of multiple subwoofers or direct connection to full-range speakers of the same brand such as Martin Audio Blackline X12, TORUS T1215 or WPS/WPM line array.

The SX115 can operate in two modes: Omni-directional when used alone or Cardioid (radial) when paired – helping to control bass projection and reduce bass feedback behind the stage. The Cardioid configuration is especially effective in enclosed spaces, providing cleaner, more focused bass for professional performance.

Convenience and overall design – Compact, easy to move and install

Despite its powerful performance, the Martin Audio SX115 remains compact in design, measuring 500 x 451 x 678mm (806mm with wheels) and weighing just 36.5kg. The speaker is equipped with a sturdy handle, optional casters, and a pole mount for easy installation with full-range speakers.

This is especially useful for technicians setting up professional event systems or karaoke bars, saving time and effort. The overall design is typical of Martin Audio - powerful, streamlined and modern, suitable for both fixed installations and mobile sound systems.

Applications of Sub Martin Audio SX115

The Martin Audio SX115 subwoofer is a professional subwoofer designed to deliver powerful, accurate and consistent bass performance in a wide range of audio environments. Typical applications of the Martin Audio SX115 include:

• High-class karaoke room.
• Bar, Lounge, Club & Acoustic Café.
• Halls, theaters, event centers.
• Outdoor stage, mobile sound system.
• Recording studio & rehearsal studio.

Where to buy genuine and reliable Martin Audio SX115 Karaoke Sub?

Phuc Truong Audio is the official distributor of Martin Audio in Vietnam, specializing in providing karaoke speakers, stage speakers, subwoofers and professional sound systems.

With over 10 years of experience in the field of sound and lighting, Phuc Truong Audio has become a trusted address for thousands of customers, from family music lovers to stage sound engineers.

At Phuc Truong Audio, customers can experience the Martin Audio SX115 Karaoke Sub in a test room that meets acoustic standards, with direct support from a team of technicians specializing in sound system design and installation.

Reasons to buy Martin Audio SX115 at Phuc Truong Audio:

• 100% genuine goods – imported directly from Martin Audio distributor in Vietnam, full labels, serial numbers and warranty cards.
• Good price – transparent – ​​12 month warranty, lifetime technical support.
• “Test on-site – Install on-site” service, customers can try it out before deciding to buy.
• The "Trade-in - 0% installment" policy makes upgrading your sound system easier.
• Professional team of technicians, consulting on standard technical combinations (Cardioid Array, PA configuration, high-end karaoke...).

Frequently asked questions about Sub Martin Audio SX115

1. Which space is the Martin Audio SX115 Subwoofer suitable for?

Martin Audio Karaoke Sub The SX115 is a 15-inch subwoofer capable of responding to low frequencies down to 36Hz and peak power up to 3200W, so this product is suitable for high-end karaoke rooms from 25-40m², bars, clubs, studios, halls or professional performance stages. With a maximum SPL of 142dB, the SX115 creates a powerful, evenly distributed bass while still maintaining detail and accuracy.

2. Can the Martin Audio SX115 Subwoofer be used for a high-end home karaoke system?

Absolutely. With its Direct Radiating design and 100dB sensitivity, the Martin Audio SX115 easily integrates into a high-end karaoke system, delivering thick, solid bass that blends with the background music. When combined with speakers Martin Audio Blackline X12 or TORUS T1215, the system will achieve a great balance between bass and midrange, making vocals warmer and more natural.

3. Can the SX115 sub be paired with Cardioid to control bass direction?

Yes, and this is one of the SX115's outstanding strengths. When paired, the SX115 can operate in Cardioid Sub Array mode, which helps control the bass direction, reducing bass reflection behind the stage or walls, while increasing bass energy towards the listener. This configuration is especially useful for closed karaoke rooms, small bars and clubs, or indoor stages where a more focused and clean bass is needed.

See more technical instructions in the article: How to connect subwoofer to amplifier to create high quality sound

4. Which amplifier should be used to effectively coordinate with SX115?

To get the most out of the Martin Audio SX115, it is recommended to use a power amplifier with a capacity of 1000–1500W/8Ω, corresponding to the speaker's rated power of 800W AES. Some suitable amplifier options include Martin Audio iKON iK42, Powersoft K Series, or Crown XTi/XLi Series. When properly driven, the SX115 delivers deep bass, powerful punch, and extremely low distortion, maintaining consistent performance over hours of continuous operation.