ITS HERE - THE FINAL EDIT

PRO 50 MK-4

A NECESSITY - NOT A LUXURY

In 2000, the PRO 50 set the standard. Twenty Five years later, we present the PRO 50 MK-4: the future of BASS.

In 2000 ...

the original PRO 50 set the benchmark
for compact subwoofer excellence.

Now, twenty-five years later,
we proudly introduce the PRO 50 MK-4

a true evolution and the future of bass.

PRO 50 MK - 4

MJ Acoustics PRO 50 MK-4: The Final Edit

Meticulously engineered and redesigned from the ground up, the PRO 50 MK-4 carries forward the legacy of the original with groundbreaking enhancements. This fourth generation marvel combines audiophile grade performance with everyday usability in a compact 280mm cube, capable of seamlessly integrating into any system and room size – from compact satellite setups to full range floor standing speakers.

The PRO 50 Mk-4 is designed to make setup effortless, leaving the groundbreaking features accessible through the SR+ app. Thanks to its plug-and-play functionality, all you need to do is connect your LFE input and power it on. The subwoofer is pre-configured with an 80 Hz crossover and -40 dB gain, so you can immediately start enjoying deep, precise bass without any complex adjustments. It’s that simple. No complicated configurations, just seamless integration and unbeatable sound — right out of the box.

The PRO 50 Mk-4 takes user convenience and control to the next level with full app control, allowing you to fine-tune every aspect of your subwoofer's performance directly from your smartphone. With the intuitive SR+ App, available on both Google Play and the App Store, you can easily adjust settings for gain, phase, and crossover to match your system’s needs — all from the palm of your hand.

Refined Design, Uncompromising Performance

Wrapped in a refined Black Ash real wood veneer, the PRO 50 MK-4 is not only built to sound phenomenal but to look at home in any high-end setup. It delivers powerful, cinematic low end for the most demanding movie soundtracks and remains agile, tight, and nuanced for critical music listening.

This is not just a subwoofer—it’s a legacy redefined.

MJ Acoustics PRO 50 MK-4
25 years in the making. Designed for the next generation of sound.

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App Controlled: Advanced control via the SR+ App

Over Two Decades of the PRO 50

2000

A Legacy of Excellence - PRO 50


In the year 2000, MJ Acoustics set the standard with the original PRO 50 – a subwoofer that redefined what's possible from a compact enclosure.

When the original PRO 50 launched in 2000, it didn't just make waves—it made history. Garnering multiple international Hi-Fi awards, it became a benchmark for compact subwoofer performance.

🏆 5 Stars from What Hi-Fi, Hi-Fi News, Home Cinema Choice, Home Cinema, and Essential Home Cinema.
🌐 4 Globes from Hi-Fi World.

These accolades weren’t just praise, they were proof. The PRO 50 delivered audiophile grade bass in a size and price point the world hadn’t seen before. And now, 25 years later, that same spirit of innovation powers the PRO 50 MK-4.

2006

Evolution of a Classic


Launched in 2000, the original PRO 50 featured a 40W Class A/B amplifier, 8” driver, and single crossover—a compact powerhouse that redefined entry-level subwoofers. In 2006, the Mk2 introduced refined components and better integration, three times the power output and a much larger driver all at the same time housed in the same size cabinet paving the way for the PRO 50 Mk3. And to futher add value we added Twin Crossovers to this entry level model.

2010

The Improvement of a Groundbreaker


In 2010 the Mk3 added dramatic improvements in performance with an upgraded 120W class A/B Amplifier, lower noise filter circuitry, making the feature of twin crossovers ever closer to audiophile integration. The Mk3 delivers tighter bass, broader system compatibility, and even greater musicality.

2025 - A Legacy Reborn

Celebrating 25 Years of Bass Innovation - PRO 50 MK-4


The PRO 50 MK-4 – A masterpiece of design, performance, and control. It’s not just an update – it’s a revolution in bass.

Over the decades, it has evolved - each generation redefining what’s possible in bass precision, control, and integration. From the original’s 40W amp and 8” driver, to the Mk2 and Mk3's refinement, and the leap to a 120W amp, 10” driver, and twin crossovers the PRO 50 has never stood still.

Now, in 2025, the PRO 50 Mk4 arrives as the most advanced version yet. Boasting a powerful 150W Class A/B MOSFET amplifier, a newly engineered MJ proprietary 10” ultra long-throw driver, and fully app controlled settings via the intuitive SR+ App, it delivers the kind of deep, controlled, cinematic bass that transforms any system. With auto on/off, dual LFE inputs, phase control in 1° steps, and true plug and play ease, it’s designed to integrate effortlessly no matter your setup.

This isn’t just a subwoofer. It’s the result of 25 years of relentless refinement. Every feature, every detail, engineered to give you the bass your system has been missing. Once you hear it, you’ll wonder how you ever lived without it.

The PRO 50 Mk4 isn’t a luxury—it’s a necessity.

Plug & Play Simplicity - Pre set to 80 Hz with -40 dB gain for instant gratification and ease of setup. Just unbox, connect power and RCA from your AV receiver and enjoy.

Soft Start Technology- Digitally controlled time delay eliminates thumps and bangs on power-up.

App-Controlled Precision - Fine-tune performance, advance adjustments in hi fi setup via the SR+ App

Available on Google Play & App Store
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MJ Reference Pro 50 MK - 4 Subwoofer | Detailed Specifications

Amplifier

150 -Watt Class A/B Mosfet

Frequency Response

19Hz – 200Hz (-3db in room)

Crossover Range

20Hz – 120Hz
With (200Hz Bypass)

 

Driver

10 Inch (250mm)

Ultra Long Throw

Heavy Duty Steel Basket

Dual high intensity full saturation magnets

Extended pole piece

 

Input Connectors

High level : Neutrik speakon - Stereo Input

LFE : 1 x RCA (24 Karat Gold Plated)

LFE / Centre :  1 x RCA (24 Karat Gold Plated)

 

Gain Control

-99   –   0 dB

 

Phase Control

0 – 180° with 1° Increments

 

Remote Control

Smart Remote Plus App ( IOS / Android )

 

Electronics

D.I.P. (Dynamic Intelligent Protection)

D.A.M.P. (Digitally Accurate Mirco-Processor) 3rd Gen

Auto On / Off Circuit (with sensitivity adjustments)

Multiple Simultaneous Input Use

Twin Independent Crossovers

Cabinet

18mm Acoustically Inert Veneer Balanced MDF

Dimensions

280 x 330 x 280mm (W x H x D)

Weight

13 Kg

 

Finish

Black Ash  (Standard)

Custom Veneer  (Additional Cost)

Custom Paint  (Additional Cost)

Experience The Difference With MJ Acoustics

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