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Product Description

M&K Sound X15+ Subwoofer

The most advanced subwoofers technologies for the future

M&K Sound’s X+ series subwoofer features an iconic push pull architecture and its reversed double driver and non isobaric configuration means the MKS-X is effectively two subwoofers in one cabinet enabling a reduction in distortion by having one inverted driver in relation to the other, cancelling non linearities and providing totally symmetric waveforms.  

The MKS-X's new carbon fibre woofer cones have been developed for ultra high strength and rigidity to accommodate the added power and excursion of the new X+ Series. M&K Sound’s proprietary CNC machined and extruded aluminium distortion killer shorting rings also guarantee absolute control and distortion free and exemplary performance in all settings. 

  • Iconic push pull subwoofer architecture
  • New carbon fibre woofer cones
  • 25mm MDF construction and bracing
  • Convenient carrying handles for installation efficiency
  • X15+ THX Dominus certification

M&K’s function and form co-exsist in harmony
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.

THX®  THX Certified Dominus
Frequency Response 16Hz to 200Hz (Average response in room +/- 3dB)
Frequency Roll Off 16Hz (-6dB 20Hz near field)
Variable Low Pass Filter 40Hz to 125Hz continuously variable and 4th order
Phase Control 0° to 360° continuously variable
Drive Unit 2 x 15" (Extra long throw)
Amplifier Power Output RMS: 700W
0.5% THD at 300W into 4Ω
Peak: 1400W
Amplifier Type Analogue input or switch mode power output
Power Consumption Standby: 0.5W
Average: 120W
Max: 800W
Auto Power Detect On/Off Yes
Enclosure Type Push pull sealed enclosure
Connection Line level input: 2 x XLR and 2 x RCA phono
Line level output: 2 x XLR and 2 x RCA phono
Finish Satin black
Dimensions Height: 833mm / 32.8"
Width: 515mm / 20.3"
Depth: 460mm / 18.1"
Weight 30.7kg / 67.7lb

M&K Sound

Delivery & Returns


Touchstone AV are currently offering  FREE STANDARD DELIVERY to Mainland UK*. (Except for special delivery items, the price for these products will be shown during checkout)

We reserve the right to change our delivery charges as and when necessary. This does not affect your Statutory Rights.


Goods are normally dispatched within 48 hours following receipt of order and confirmed payment, please allow up to 5 working days for your goods to be delivered. If your order is likely to take any longer or is one of our special order items, one of our customer services representatives will contact you to let you know.


Touchstone AV want you to be completely satisfied with all purchases made from us. In the unlikely event that you would like to return any item to us, please refer  our refunds and returns section.

Customer Reviews

M&K Sound X15+ Subwoofer

  • X15+ THX Dominus certification
  • Convenient carrying handles for installation efficiency