M&K Sound X15+ Subwoofer
Delivering thunderous low bass with remarkable composure, the X15+ combines dual 15-inch push-pull drivers, a sealed enclosure and 1,400W peak power for reference-scale home cinema impact. Jiles McCoy found powerful output down to 14Hz without audible strain, while Home Cinema Choice highlights its distortion-reducing architecture. THX Dominus certification, balanced connectivity and flexible filtering complete a formidable bass specialist.
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Nicely Roasted
Bass
94/100
Integration
50/100
Dynamics
90/100
Build Quality
86/100
Features Usability
82/100
Value for Money
87/100
Pros
Delivers exceptionally deep, high-output bass, with measured 102dB output at 14Hz and strong performance from 20Hz downward.
Maintains composed, clean performance under demanding low-frequency effects without sounding strained.
Sealed dual-15-inch push-pull design is engineered to reduce distortion while increasing bass output potential.
Offers versatile setup via XLR and RCA connections, variable phase and crossover controls, THX bypass, and two EQ modes.
Cons
Its near-metre-tall, 60kg-plus enclosure is difficult to position and requires assistance to move.
All adjustments are manual; there is no companion app for remote setup or control.
Premium $6,000 pricing places it firmly in specialist home-cinema territory.
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What Reviewers Are Saying
Assessments of Build Quality, Usability, and Overall Propositions.
Bass
94/100
Reviewers describe exceptionally forceful low-end performance: Jiles McCoy calls it "absolutely thunderous," says its bass energy is "fantastic," and found it strong from 20Hz downward with substantial bottom-end output. He also reports 102dB at 14Hz and says a single unit should provide enough bass for almost all listeners.
Integration
50/100
The supplied reviews do not report how seamlessly the X15+ blends with main speakers, whether it disappears in the room, or whether bass remains free of localization and overhang. Its crossover, phase controls and THX mode offer useful setup tools, but reviewers provide no real-world integration outcome evidence.
Dynamics
90/100
The X15+ is reported to deliver serious low-frequency impact, including 102dB at 14Hz in Jiles McCoy's test environment. During demanding use, he says it never sounded in peril or as if it were struggling, supporting the impression of substantial headroom and composure.
Build Quality
86/100
Construction appears purposeful and substantial, with a 25mm MDF cabinet, additional bracing intended to control vibration and resonances, and a sealed push-pull dual-driver layout. Audioholics also identifies carbon-fiber cones, while the 134.7lb enclosure reinforces the product's heavyweight physical execution; the reviews say little about long-term durability.
Features Usability
82/100
The X15+ provides flexible physical controls, including continuously variable phase, selectable fixed or variable low-pass filtering, a bypass mode, two EQ options, and both balanced XLR and RCA inputs and outputs. Setup is entirely manual, however: Jiles McCoy notes there is no app, which makes adjustment less convenient than on app-enabled rivals.
Value for Money
87/100
At a stated $6,000 MSRP, the X15+ is a premium subwoofer aimed at a demanding home-cinema buyer. Audioholics suggests its performance should exceed what the price step over the smaller X-series models might imply, while Jiles McCoy considers its output sufficient for nearly everybody with one unit; neither review presents it as a bargain.
Reviews & Sources
Professional reviews and sources for this product's Watt'n Potatoes analysis.
Online Reviews & Mentions
YouTube Reviews
Forum Mentions
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Specifications
- Frequency Response
- 16-200 Hz (Average Response in Room +/- 3 dB)
- Frequency Roll Off – THX EQ
- 16 Hz (-6 dB 20 Hz Nearfield)
- Frequency Roll Off – Anechoic EQ
- 16 Hz (-6 dB 20 Hz Nearfield)
- Variable Low Pass Filter
- 40-125 Hz Continuesly Variable / 4th Order
- Loss Pass Filter Bypass
- 40-125 Hz No Low Pass
- Fixed 80 Hz Filter
- Yes (Equivalent to THX 80Hz Ref Low Pass)
- Phase Control
- 0 – 180 deg Continuesly Variable
- Line level input/output
- 2 x RCA phono Left / Right – input / output
- Line level input/output
- 2 x XLR Left / Right – Input / output
- Amplifier type
- Analog input / switch mode power output
- Drive unit
- 2 x 15″ Extra Long Throw
- System Principle
- Push Pull Sealed enclosure
- Amplifier Power output RMS
- 700 watt 0.5% THD at 300W into 4 ohms
- Amplifier Power output Peak
- 1400 watt
- Standby Power Consumption
- 0.5 watt 120W Average, 800W Max
- Headroom Limiter Maximizer
- Yes (Dynamic driver excursion control)
- Auto Power detect on/off
- Yes
- Finish
- Satin Black
- Dimensions
- H x W x D 32.8 x 20.3 x 18.1 in / 83.3 x 51.5 x 46.0 cm
- Weight
- Netto 134.7 lbs / 61.1 kg
- Manual
- No
- Manual
- Yes Gloves, US/EU Power cords, Rubber Feet
Manufacturer's Description — M&K Sound
The most advanced subwoofers technologies for the future
New Carbon Fibre Woofer Cones have been developed for all models with ultra-high strength and rigidity to accommodate the added power and excursion of the new X Series. M&K Sound’s proprietary CNC-machined, extruded aluminium Distortion Killer Shorting Rings also guarantee absolute control and distortion-free, exemplary performance in all settings.
M&K Sound’s iconic Push-Pull subwoofer architecture and “reversed double driver” non-isobaric configuration mean that both drivers in the cabinet are ‘exposed’ to room air. Consequently, and like the X-Series before, the X Series models are effectively two subwoofers in one cabinet enabling a further associated reduction in distortion. This is made possible by having one inverted driver in relation to the other cancelling non-linearities to produce totally symmetric waveforms.
The X15, X12 and X10 all feature full 25mm MDF construction and bracing for negligible panel vibrations or cabinet resonances, and increased venting at the base of the woofers mitigates distortion due to air turbulence. These milled cavities also act as convenient carrying handles for installation efficiency
Cosmetic makeovers for the X Series arrive in the form of recessed front baffles and convenient invisible magnetic grille attachment mechanisms. Harmonizing with the bold but Scandi-cool looks of the M&K S150 and S300 speakers, the new subwoofers offer cleaner lines and more discreet curved edges to complement living spaces or dedicated home cinema rooms
A Message from the Inventors of the Subwoofer
“Creating the next generation of M&K Sound subwoofers was not something we undertook lightly. With a long legacy of market-leading innovation to live up to, we are proud to present the M&K Sound X Series, built to bring new force, authority and clarity to the critical bottom octaves for the listening pleasure of serious music and movie lovers everywhere.”
Why Your system Needs an M&K Sound X+ Series Subwoofer
Above and beyond the obvious, simplistic answer: “more and better bass”, the combination of a well designed and conscientiously constructed subwoofer and main satellite speakers offers worthwhile performance advantages that improve overall system performance in many critical areas that are equally relevant for stereo and surround, for movie viewing and music listening
Here’s what happens when you physically separate reproduction of low frequency information from the upper and mid ranges. The most widely acknowledged beneft, of course, is improved deep bass extension, higher deep bass output levels and more control and authority, i.e., your system will play deeper, louder, cleaner, tighter bass.
With an M&K Sound X Series subwoofer, bass is exclusively reproduced by a speaker created and optimized for that purpose only. Removing the burden of deep bass from your main speakers provides major improvements in essential parameters such as midrange purity and accuracy. By liberating your main speakers from handling the tremendous demands of low bass, you also increase their effective power handling capabilities signifcantly, so that they can play louder without distortion.
Because your main amplifer no longer handles deep bass, the amount of power needed to achieve a given output level from your main speakers is greatly reduced (typically -50%). This ensures that your amp remains well within its safe operating limits with considerable overhead readily available as needed. Independent placement of subwoofer and satellites allows you to select an optimal position for each specifc frequency range. The spot that delivers best bass is almost never the one that also delivers best upper/mid performance. With no bass vibrations or internal bass pressure waves in your main speaker enclosures, resonances are eliminated for cleaner, clearer mid and high frequencies.
Since they no longer have to reproduce deep bass, your main speaker cabinets can be more compact with enhanced structural integrity for natural, uncolored sound and a narrow front that eliminates baffle diffraction distortion, resulting in more open, natural, three-dimensional sound.
No matter what some manufacturers may try to tell you, according to the immutable laws of physics: Big bass requires a big box.
Independent Evaluation
THX is a set of performance standards originally developed by Lucasfilm Ltd, the movie empire of Star Wars creator George Lucas, to lay out a set of criteria to ensure that the creations of cinematic artists are reproduced exactly as intended. The THX logo immediately became recognized as a seal of approval for quality-conscious cinema-goers around the world.
In 1991, M&K SOUND became one of the first manufacturers to join George Lucas and his Lucasfilm Home THX program for domestic installations.
Today, THX is the highest independent quality standard dedicated to the accurate reproduction of audio sources in the home. THX certification attests that the component has been thoroughly evaluated by a fully independent body and found to live up to the strictest quality requirements in the audio industry.
M&K SOUND X Series subwoofers meet and exceed THX specifications to deliver music and movies with natural, effortless realism and power.
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Authorized dealers for M&K Sound X15+ Subwoofer
- American Recorder — online and in-store — Simi Valley, California, United States (website)
- AUDIO 2000 — in-store — Wuppertal, Nordrhein-Westfalen, Germany (website)
- Audio Venue — online and in-store — London, England, United Kingdom (website)
- Audiolab Stereo & Video — online and in-store — Morrisville, Pennsylvania, United States (website)
- AudioPerformance — online and in-store — Stenkullen, Västra Götalands län, Sweden (website)
- AUTOMATED ENTERTAINMENT INC. — online and in-store — Vaughan, Ontario, Canada (website)
- Dubai Audio — online and in-store — Al Wasl, Dubai, United Arab Emirates (website)
- Elecson KLS — online and in-store — Paris, Île-de-France, France (website)
- Fidelity Acker & Buck — in-store — Rellingen, Schleswig-Holstein, Germany (website)
- Grahams Hi-Fi — in-store — London, England, United Kingdom (website)
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