BK Electronics Monolith-DF vs Funk Audio Classic 18.0

Last updated: September 16, 2026

Short answer: the Funk Audio Classic 18.0. It ranks #16 of 110 subwoofers by sound quality at $4893.35; 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 Funk Audio Classic 18.0

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 Funk Audio Classic 18.0 offers: Independent CEA-2010 testing records 106.5 dB at 20 Hz and 127.3 dB through 40-80 Hz. The sealed enclosure with 18” (457mm) driver delivers formidable 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 571.5H x 558.8W x 520.7D mm cabinet and 52.2 kg mass still require deliberate placement and calibration.

Buy the Funk Audio Classic 18.0. It ranks higher for sound quality than the BK Electronics Monolith-DF and costs less, so there is no real case for the other one.

If sound quality matters at all to you, skip the BK Electronics Monolith-DF. It ranks near the bottom of the 110 subwoofers, so look higher up the list instead.

Want more options? Browse the full Subwoofers rankings.

Specifications Side By Side

BK Electronics Monolith-DF Funk Audio Classic 18.0
Price$8995$4,893.35
Ranked#107 of 110 in Large Home Subwoofers (Over 75 lbs)#16 of 110 in Large Home Subwoofers (Over 75 lbs)
Enclosureported, bottomsealed
Output SPL at 15 Hz91.3 dB102.3 dB
Output SPL at 20 Hz102.0 dB106.5 dB
Output SPL at 25 Hz106.4 dB111.7 dB
Output SPL at 31.5 Hz108.3 dB119.0 dB
Output SPL at 40 Hz108.6 dB124.6 dB
Output SPL at 50 Hz108.7 dB126.8 dB
Output SPL at 63 Hz108.6 dB128.4 dB
Output SPL at 80 Hz107.7 dB129.6 dB
CEA-2010-A Average (40-80Hz)108.4 dB127.3 dB
Dimensions23.8"H x 21.3"W x 16.5"D (603.8 x 539.8 x 419.9 mm)22.5"H x 22"W x 20.5"D (571.5 x 558.8 x 520.7 mm)
Weight103.2 lbs (46.8 kg)115.1 lbs (52.2 kg)
Warranty23
Cabinet Colorblack, woodwood, custom
CountryUnited KingdomCanada
Measurement SourceIlkka RissanenData-bass
Drivers12" (305mm) driver with ported design18" (457mm) driver
Output SPL at 10 Hz-94.6 dB
Output SPL at 12.5 Hz-98.4 dB
Output SPL at 100 Hz-130.2 dB
Output SPL at 125 Hz-130.8 dB

How Funk Audio Classic 18.0 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 →

Funk Audio Classic 18.0: $4,893.35 eBay

Funk Audio Classic 18.0 ranking card

Pros: Independent CEA-2010 testing records 106.5 dB at 20 Hz and 127.3 dB through 40-80 Hz. The sealed enclosure with 18” (457mm) driver delivers formidable 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 571.5H x 558.8W x 520.7D mm cabinet and 52.2 kg mass still require deliberate placement and calibration.

Notes: Data-bass labeled this sub as ‘FW18.0’, but original name is 18.0

Full Funk Audio Classic 18.0 review and specifications →

CEA-2010-A Average (40-80Hz)127.3 dB
Cabinet Colorwood, custom
CountryCanada
Dimensions22.5"H x 22"W x 20.5"D (571.5 x 558.8 x 520.7 mm)
Drivers18" (457mm) driver
Enclosuresealed
Measurement SourceData-bass
Output SPL at 10 Hz94.6 dB
Output SPL at 12.5 Hz98.4 dB
Output SPL at 15 Hz102.3 dB
Output SPL at 20 Hz106.5 dB
Output SPL at 25 Hz111.7 dB
Output SPL at 31.5 Hz119.0 dB
Output SPL at 40 Hz124.6 dB
Output SPL at 50 Hz126.8 dB
Output SPL at 63 Hz128.4 dB
Output SPL at 80 Hz129.6 dB
Output SPL at 100 Hz130.2 dB
Output SPL at 125 Hz130.8 dB
Warranty3
Weight115.1 lbs (52.2 kg)
Search eBay for Funk Audio Classic 18.0 →