BK Electronics Monolith-DF vs Monoprice Monolith M-215

Last updated: September 16, 2026

Short answer: the Monoprice Monolith M-215. It ranks #23 of 110 subwoofers by sound quality at $2999.99; the BK Electronics Monolith-DF ranks #107 and costs $8995, so there is little reason to consider the other one.

BK Electronics Monolith-DF vs Monoprice Monolith M-215

What the BK Electronics Monolith-DF offers: 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. Watch for: 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.

What the Monoprice Monolith M-215 offers: Independent CEA-2010 testing records 118.9 dB at 20 Hz and 125.9 dB through 40-80 Hz. The ported, front enclosure with 2x 15” (381mm) drivers has the headroom for demanding film bass in a large room. Watch for: The 1074.4H x 508.0W x 701.0D mm cabinet and 98.0 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.

Buy the Monoprice Monolith M-215. It ranks higher for sound quality than the BK Electronics Monolith-DF and costs less, which settles it without a real tradeoff to make.

Skip the BK Electronics Monolith-DF if sound quality matters to you. It ranks near the bottom of the 110 subwoofers.

Looking for alternatives? See the complete Subwoofers rankings.

Buy the Monoprice Monolith M-215 at Monoprice ($2999.99) →

Specifications Side By Side

BK Electronics Monolith-DF Monoprice Monolith M-215
Price$8995$2999.99
Ranked#107 of 110 in Large Home Subwoofers (Over 75 lbs)#23 of 110 in Large Home Subwoofers (Over 75 lbs)
Enclosureported, bottomported, front
Output SPL at 15 Hz91.3 dB113.1 dB
Output SPL at 20 Hz102.0 dB118.9 dB
Output SPL at 25 Hz106.4 dB122.6 dB
Output SPL at 31.5 Hz108.3 dB125.2 dB
Output SPL at 40 Hz108.6 dB126.4 dB
Output SPL at 50 Hz108.7 dB126.1 dB
Output SPL at 63 Hz108.6 dB125.6 dB
Output SPL at 80 Hz107.7 dB125.6 dB
CEA-2010-A Average (40-80Hz)108.4 dB125.9 dB
Dimensions23.8"H x 21.3"W x 16.5"D (603.8 x 539.8 x 419.9 mm)42.3"H x 20"W x 27.6"D (1074.4 x 508.0 x 701.0 mm)
Weight103.2 lbs (46.8 kg)216.1 lbs (98.0 kg)
Warranty25
Cabinet Colorblack, woodblack
CountryUnited KingdomUnited States
Measurement SourceIlkka RissanenBrent Butterworth
Drivers12" (305mm) driver with ported design2x 15" (381mm) drivers
Output SPL at 12.5 Hz-103.9 dB
Output SPL at 100 Hz-125.7 dB
Output SPL at 125 Hz-126.3 dB
Buy the Monoprice Monolith M-215 at Monoprice ($2999.99) →

How Monoprice Monolith M-215 compares with other leading options:

Prices on this page were last checked September 16, 2026 at 12:41 AM 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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The Two Speakers In Full

BK Electronics Monolith-DF: $8995 eBay

BK Electronics Monolith-DF ranking card

Pros: 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.

Full BK Electronics Monolith-DF review and specifications →

CEA-2010-A Average (40-80Hz)108.4 dB
Cabinet Colorblack, wood
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
Measurement SourceIlkka Rissanen
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
Warranty2
Weight103.2 lbs (46.8 kg)
Search eBay for BK Electronics Monolith-DF →

Monoprice Monolith M-215: $2999.99 Monoprice eBay

Monoprice Monolith M-215 ranking card

Pros: Independent CEA-2010 testing records 118.9 dB at 20 Hz and 125.9 dB through 40-80 Hz. The ported, front enclosure with 2x 15” (381mm) drivers has the headroom for demanding film bass in a large room.

Cons: The 1074.4H x 508.0W x 701.0D mm cabinet and 98.0 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.

Notes: Product # 38543

Full Monoprice Monolith M-215 review and specifications →

CEA-2010-A Average (40-80Hz)125.9 dB
Cabinet Colorblack
CountryUnited States
Dimensions42.3"H x 20"W x 27.6"D (1074.4 x 508.0 x 701.0 mm)
Drivers2x 15" (381mm) drivers
Enclosureported, front
Measurement SourceBrent Butterworth
Output SPL at 12.5 Hz103.9 dB
Output SPL at 15 Hz113.1 dB
Output SPL at 20 Hz118.9 dB
Output SPL at 25 Hz122.6 dB
Output SPL at 31.5 Hz125.2 dB
Output SPL at 40 Hz126.4 dB
Output SPL at 50 Hz126.1 dB
Output SPL at 63 Hz125.6 dB
Output SPL at 80 Hz125.6 dB
Output SPL at 100 Hz125.7 dB
Output SPL at 125 Hz126.3 dB
Warranty5
Weight216.1 lbs (98.0 kg)
Check current price at Monoprice ($2999.99) →Search eBay for Monoprice Monolith M-215 →