Funk Audio Classic 18.0 vs Funk Audio Custom 21.0

Last updated: September 8, 2026

Short answer: the Funk Audio Custom 21.0 on measured sound quality, the Funk Audio Classic 18.0 on price. The Funk Audio Custom 21.0 ranks #10 of 97 subwoofers at $6061.91. The Funk Audio Classic 18.0 ranks #11 at $4893.35, $1168.56 cheaper.

Buy the Funk Audio Classic 18.0 when the price outweighs sound quality for you, and the Funk Audio Custom 21.0 when sound quality outweighs the price instead.

Funk Audio Classic 18.0 vs Funk Audio Custom 21.0

Specifications Side By Side

Funk Audio Classic 18.0 Funk Audio Custom 21.0
Price$4,893.35$6,061.91
Ranked#11 of 97 in Large Powered Home Subwoofers (Over 75 lbs)#10 of 97 in Large Powered Home Subwoofers (Over 75 lbs)
Enclosuresealedsealed
Output SPL at 10 Hz94.6 dB97.4 dB
Output SPL at 12.5 Hz98.4 dB101.1 dB
Output SPL at 15 Hz102.3 dB105.7 dB
Output SPL at 20 Hz106.5 dB109.8 dB
Output SPL at 25 Hz111.7 dB114.2 dB
Output SPL at 31.5 Hz119.0 dB120.4 dB
Output SPL at 40 Hz124.6 dB124.1 dB
Output SPL at 50 Hz126.8 dB126.8 dB
Output SPL at 63 Hz128.4 dB129.0 dB
Output SPL at 80 Hz129.6 dB131.0 dB
Output SPL at 100 Hz130.2 dB132.6 dB
Output SPL at 125 Hz130.8 dB133.0 dB
CEA-2010-A Average (40-80Hz)127.3 dB127.7 dB
Dimensions22.5"H x 22"W x 20.5"D (571.5 x 558.8 x 520.7 mm)22.8"H x 22.2"W x 20.5"D (577.9 x 565.1 x 520.7 mm)
Weight115.1 lbs / 52.2 kg145.1 lbs / 65.8 kg
Warranty33
Cabinet Colorwood, customwood, custom
CountryCanadaCanada
Measurement SourceData-bassData-bass
Drivers18" (457mm) driver21" (533mm) driver

More top alternatives to Funk Audio Custom 21.0:

Prices on this page were last checked September 8, 2026 at 6:02 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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The Two Speakers In Full

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 →

Funk Audio Custom 21.0: $6,061.91 eBay

Funk Audio Custom 21.0 ranking card

Pros: Independent CEA-2010 testing records 109.8 dB at 20 Hz and 127.7 dB through 40-80 Hz. The sealed enclosure with 21” (533mm) driver has the headroom for demanding film bass in a large room.

Cons: The 577.9H x 565.1W x 520.7D mm cabinet and 65.8 kg mass make this a serious placement and moving commitment. A sealed cabinet still needs careful placement and calibration to avoid room-mode peaks.

Notes: Data-bass labeled this sub as ‘FW21.0’, but original name is 21.0

Full Funk Audio Custom 21.0 review and specifications →

CEA-2010-A Average (40-80Hz)127.7 dB
Cabinet Colorwood, custom
CountryCanada
Dimensions22.8"H x 22.2"W x 20.5"D (577.9 x 565.1 x 520.7 mm)
Drivers21" (533mm) driver
Enclosuresealed
Measurement SourceData-bass
Output SPL at 10 Hz97.4 dB
Output SPL at 12.5 Hz101.1 dB
Output SPL at 15 Hz105.7 dB
Output SPL at 20 Hz109.8 dB
Output SPL at 25 Hz114.2 dB
Output SPL at 31.5 Hz120.4 dB
Output SPL at 40 Hz124.1 dB
Output SPL at 50 Hz126.8 dB
Output SPL at 63 Hz129.0 dB
Output SPL at 80 Hz131.0 dB
Output SPL at 100 Hz132.6 dB
Output SPL at 125 Hz133.0 dB
Warranty3
Weight145.1 lbs / 65.8 kg
Search eBay for Funk Audio Custom 21.0 →