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The New and Awesome Monolith-DF Subwoofer 300W RMS (600W Peak) 12" Ported Reflex - £504.95
With a genuine in room response of 15Hz @ -3dB
Light Oak

The Monolith receives a 5 Star Best Buy.. Click here for the Monolith subwoofer review


Adam Rayner concludes:-

This subwoofer can be considered an outstanding buy - maybe even the best value for money currently in domestic electronics. It comes recommended, without caveat

Introduction:- Since we introduced the XLS200 our compact high power subwoofer, it has become apparent that there is a need for a budget high power, high SPL and low distortion subwoofer at a realistic price, with this in mind the Monolith was born. Designed from the speaker upwards the Monolith represents a significant saving in price vs performance and at a smidge over £400 we are offering a serious subwoofer.
The Amplifier:- At the heart of the Monolith is our B.LAT Amplifier, starting it's life in the original REL Studio and Stentor subwoofers this amplifier has been continously refined and now includes an array of features and controls not found on any other subwoofer in this price range. Controls include volume adjustment for both high and low level inputs, low pass frequency contour 40 to 120Hz and a continous phase adjustment. With all these functions avalible to hand the Monolith Plus amplifier will allow the end user varied connection options and ease of fine tuning. This amplifier is built here at our UK factory and is rated at 300W RMS and 600W RMS peak dynamic.

The Monolith amplifier hand built by B.K. Electronics



The Cabinet:- Out of necessity the cabinet has to be large after all we are designing a high SPL and low distortion subwoofer. The cabinet has to be strong, rigid and not colour the sound. So, it's made from 25mm MDF and critically braced. The port has a 100mm internal diameter and is flared both ends to further eliminate port noise.
The Flared Port
The Superb Drive Unit Front
and Back
Drive Unit:- A 300mm / 12" twin magnet drive unit to increase linear excursion, a cast basket for a solid uncoloured projection of sound without ringing and vented pole piece to help reduce power compression
System Type: 95 Litre reflex tuned to 20Hz, cabinet manufactured from veneered 25mm MDF and Critically braced
Distortion: 5% 102dB @ 20Hz
Frequency Response at -3dB: 20Hz / In Room at 15Hz
Amplifier Input / Output Impedance: High Level 100K - Low Level 10K - Balanced 10K
Gain Control Range: 80dB
Drive Unit Impedance: 4 Ohm
Mains Input: 230V / 50Hz
Dimensions: 420D X 604H x 540W
Weight: 46.75kg
Finishes: Black Ash Veneer, Light Oak Veneer and Cherry Veneer
  • 2 Years Warranty
  • True 300W continuos discrete Mosfet amplifier
  • Truly hand built in Great Britain, when we claim hand built we mean hand built, as there are no SMD components or other automatic placement devices.
  • Downward Firing 300mm (12")
  • Continuously variable frequency control
  • Audiophile grade toroidal transformers
  • Gas Tight Neutrik connection for long term consistency of sound quality
  • Separate controls for high and low-level input adjustment
  • Simultaneous connection of high and low level sources
  • Balanced Inputs
  • Thermal Protection
  • Anti Thump
  • ASP automatic speaker protection audibly transparent driver protection
  • 4 x 16A output devices for effortless current control
  • IEC Power Socket
  • Doubled flared port for reduced port noise
Adobe   Click here for the user manual
Adobe   Click here for the full review


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Accessories Supplied with Subwoofer
Optional Extra
5m Mono RCA Phono Interconnect, Set of M8 Spikes, Mains lead and Manual
To Order a 5, 10 or 15M High Level Lead Click HERE
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Due to Brexit the trading relationship between the UK and EU has changed for further information on how to place an order please contact us via email

(c) 2021 BK Electronics - Unit 1 Comet Way, Southend-On-Sea, Essex SS2 6TR - Tel ; 01702 527572 email