Monolith Plus -FF
International Orders
Designed And Manufactured In The UK
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The New and Awesome Monolith Plus -FF Subwoofer 500W RMS (1000W Peak)12" Ported Reflex - £609.95
Black Ash
Light Oak


Please note that the feet fitted to the Monolith Plus -FF in the picture above are the M8 SuperSpikes, these do not come fitted as standard and will need to be purchased separately. SuperSpikes can be found on our website HERE
Gloss Black
Introduction:- The Monolith Plus is the new upgraded version of our standard Monolith. The upgrade comprises of a 500W amplifier and a Lab 12 loudspeaker to give at least an extra +3dB SPL over the standard Monolith for those who require more from their subwoofer. The amplifier is a beefed up version of our 300W Monolith ampliier and boasts a 700VA transformer and 6 MOSFETS to deliver oustanding power and performance. The LAB12 drive unit fits perfectly both electricaly and physicaly into the Monolith system and offers the same tuneful deep bass of the standard Monlith whilst delivering the outstanding SPL levels.
The Amplifier:- At the heart of the Monolith Plus 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 500W RMS and 1000W RMS peak dynamic.

The Monolith Plus 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
Coil Construction
Copper Voice Coil
  Coil Former
Polymide Former
Magnet Composition
Double Stacked 80oz. ferrite magnets
  Core Details
Vented and extended Core
Basket Materials
12-spoke die-cast aluminium Basket
  Cone Composition

Kevlar-reinforced paper cone

Cone Edge Technology
Foam cone edge
  Dust Cap Coposition
Dual inverted dust caps
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: 560D X 540H x 420W
Weight: 46.0kg
Finishes: See Below
  • 2 Years Warranty
  • True 500W 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.
  • Forward 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
  • 6 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


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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

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

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