Funk Audio Custom 21.0 vs Harbottle Audio C24 L2

Short answer: the Funk Audio Custom 21.0. It ranks #12 of 110 subwoofers by sound quality, rated 4.5/5, at $6061.91; the Harbottle Audio C24 L2 ranks #17, rated 4.4/5, and costs $10078.84, which makes this an easy call rather than a real tradeoff.

Buy the Funk Audio Custom 21.0. It is rated higher for sound quality than the Harbottle Audio C24 L2 and costs less, so there is no real case for the other one.

Looking for alternatives? See the complete Subwoofers rankings.

Specifications Side By Side

Related Speaker Comparisons

More worthwhile head-to-heads for Funk Audio Custom 21.0:

• JTR Speakers Captivator S2 vs Funk Audio Custom 21.0
• Funk Audio Custom 21.0 vs Power Sound Audio (PSA) V3600I
• Funk Audio Custom 21.0 vs Funk Audio Ultra 24.0
• Funk Audio Classic 18.0 vs Funk Audio Custom 21.0
• Monoprice Monolith 16 THX Ultra vs Funk Audio Custom 21.0

Prices on this page were last checked September 23, 2026 at 11:24 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 Custom 21.0: $6,061.91 eBay

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 →

AES Input	No
Aux Input	No
CEA-2010-A Average (40-80Hz)	127.7 dB
Cabinet Color	wood, custom
Coaxial Input	No
Country	Canada
Dimensions	22.8"H x 22.2"W x 20.5"D (577.9 x 565.1 x 520.7 mm)
Drivers	21" (533mm) driver
Enclosure	sealed
HDMI Input	No
Inputs	XLR (balanced)
Measurement Source	Data-bass
Optical Input	No
Output SPL at 10 Hz	97.4 dB
Output SPL at 12.5 Hz	101.1 dB
Output SPL at 15 Hz	105.7 dB
Output SPL at 20 Hz	109.8 dB
Output SPL at 25 Hz	114.2 dB
Output SPL at 31.5 Hz	120.4 dB
Output SPL at 40 Hz	124.1 dB
Output SPL at 50 Hz	126.8 dB
Output SPL at 63 Hz	129.0 dB
Output SPL at 80 Hz	131.0 dB
Output SPL at 100 Hz	132.6 dB
Output SPL at 125 Hz	133.0 dB
RCA Input	No
TRS Input	No
USB Input	No
Warranty	3
Weight	145.1 lbs (65.8 kg)
XLR Input	Yes

• Links
  • Funk Audio Custom 21.0 Website
• Reviews, Comparisons and Sound Samples
  • Independently measured by Data-bass; the published figures above come from this ASR subwoofer measurement thread.
• Head-to-Head Comparisons
  • Funk Audio Custom 21.0 vs Funk Audio Ultra 24.0
  • Funk Audio Custom 21.0 vs Power Sound Audio (PSA) V3600I
  • Funk Audio Custom 21.0 vs JTR Speakers Captivator S2
  • Funk Audio Custom 21.0 vs Funk Audio Classic 18.0
  • Funk Audio Custom 21.0 vs Monoprice Monolith 16 THX Ultra
  • Funk Audio Custom 21.0 vs HSU Research VTF-3 MK5 HP

Harbottle Audio C24 L2: $10,078.84 eBay

Pros: Published CEA-2010 specifications list 117.0 dB at 20 Hz and 126.6 dB through 40-80 Hz. The ported enclosure with 24” (610mm) driver has the headroom for demanding film bass in a large room.

Cons: The 899.9H x 722.1W x 512.1D mm cabinet and 68.0 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.

Full Harbottle Audio C24 L2 review and specifications →

CEA-2010-A Average (40-80Hz)	126.6 dB
Cabinet Color	black, white, red, blue
Country	Canada
Dimensions	35.4"H x 28.4"W x 20.2"D (899.9 x 722.1 x 512.1 mm)
Drivers	24" (610mm) driver
Enclosure	ported
Measurement Source	Manufacturer
Output SPL at 10 Hz	99.0 dB
Output SPL at 12.5 Hz	103.0 dB
Output SPL at 15 Hz	110.0 dB
Output SPL at 20 Hz	117.0 dB
Output SPL at 25 Hz	120.7 dB
Output SPL at 31.5 Hz	124.0 dB
Output SPL at 40 Hz	126.3 dB
Output SPL at 50 Hz	127.3 dB
Output SPL at 63 Hz	126.7 dB
Output SPL at 80 Hz	126.0 dB
Output SPL at 100 Hz	125.0 dB
Weight	149.9 lbs (68.0 kg)

• Links
  • Harbottle Audio C24 L2 Website
• Reviews, Comparisons and Sound Samples
  • These figures are manufacturer-specified rather than independently measured.
• Head-to-Head Comparisons
  • Harbottle Audio C24 L2 vs Funk Audio Classic 18.0
  • Harbottle Audio C24 L2 vs Monoprice Monolith 16 THX Ultra
  • Harbottle Audio C24 L2 vs Funk Audio Ultra 21.0LX
  • Harbottle Audio C24 L2 vs JTR Speakers Captivator S2
  • Harbottle Audio C24 L2 vs HSU Research VTF-3 MK5 HP