BK Electronics Monolith-DF Review: Rated 3.3/5

Last updated: October 21, 2026

The BK Electronics Monolith-DF is rated 3.3/5 for sound quality, #141 of 143 Large Home Subwoofers (Over 75 lbs). See all Subwoofers rankings for every top pick.

BK Electronics Monolith-DF · Editor's rating 3.3/5, ranked #141 of 143 Large Home Subwoofers (Over 75 lbs)

Prices on this page were last checked October 29, 2026 at 4:42 PM UTC. Product prices and availability are accurate as of that date/time and are subject to change; the price and availability shown on Amazon at the time of purchase will apply to the purchase of this product.

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Brand: BK Electronics

#141 BK Electronics Monolith-DF: £406.95 Discontinued eBay

Pros: A down ported 12 inch subwoofer with balanced XLR and RCA inputs at a low price, now discontinued. Independent CEA-2010 testing records 102.0 dB at 20 Hz and 108.4 dB through 40-80 Hz. The ported, bottom enclosure with 12” (305mm) driver with ported design delivers substantial upper-bass output for movie effects and music.

Cons: Deep-bass output is more limited than the strong 40-80 Hz result suggests, so it is not the right choice when the lowest movie effects are the priority. The 603.8H x 539.8W x 419.9D mm cabinet and 46.8 kg mass still require deliberate placement and calibration. Discontinued.

Is the BK Electronics Monolith-DF right for you?

Skip it if

  • you need to move it often (47 kg each).
  • you want to buy it new: it is discontinued.
AES InputNo
Aux InputNo
CEA-2010-A Average (40-80Hz)108.4 dB
Cabinet Colorblack, wood
Coaxial InputNo
CountryUnited Kingdom
Dimensions23.8”H x 21.3”W x 16.5”D (603.8 x 539.8 x 419.9 mm)
Drivers12” (305mm) driver with ported design
Enclosureported, bottom
HDMI InputNo
InputsXLR (balanced), RCA (unbalanced)
Measurement SourceIlkka Rissanen
Optical InputNo
Output SPL at 15 Hz91.3 dB
Output SPL at 20 Hz102.0 dB
Output SPL at 25 Hz106.4 dB
Output SPL at 31.5 Hz108.3 dB
Output SPL at 40 Hz108.6 dB
Output SPL at 50 Hz108.7 dB
Output SPL at 63 Hz108.6 dB
Output SPL at 80 Hz107.7 dB
RCA InputYes
TRS InputNo
USB InputNo
Warranty2
Weight103.2 lbs (46.8 kg)
XLR InputYes
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