Short answer: the Funk Audio Custom 21.0. Both are rated 4.5/5 for sound quality (#12 and #11 of 139 subwoofers), and the Funk Audio Custom 21.0 costs $6,061.91 against $18,565 for the Funk Audio Ultra 24.0, so with nothing between them on sound quality, price settles it.
Buy the Funk Audio Custom 21.0. Both are rated the same for sound quality, and it costs $12,503.09 less than the Funk Audio Ultra 24.0.
Looking for alternatives? See the complete Subwoofers rankings.
Specifications Side By Side
| Funk Audio Custom 21.0 | Funk Audio Ultra 24.0 | |
|---|---|---|
| Price | $6,061.91 | $18,565 |
| Ranked | #12 of 139 in Large Home Subwoofers (Over 75 lbs) | #11 of 139 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | sealed | sealed |
| Output SPL at 10 Hz | 97.4 dB | 101.0 dB |
| Output SPL at 12.5 Hz | 101.1 dB | 104.9 dB |
| Output SPL at 15 Hz | 105.7 dB | 111.8 dB |
| Output SPL at 20 Hz | 109.8 dB | 120.0 dB |
| Output SPL at 25 Hz | 114.2 dB | 122.0 dB |
| Output SPL at 31.5 Hz | 120.4 dB | 123.0 dB |
| Output SPL at 40 Hz | 124.1 dB | 127.1 dB |
| Output SPL at 50 Hz | 126.8 dB | 129.9 dB |
| Output SPL at 63 Hz | 129.0 dB | 127.6 dB |
| Output SPL at 80 Hz | 131.0 dB | 127.0 dB |
| Output SPL at 100 Hz | 132.6 dB | 128.2 dB |
| Output SPL at 125 Hz | 133.0 dB | - |
| CEA-2010-A Average (40-80Hz) | 127.7 dB | 127.9 dB |
| Dimensions | 22.8”H x 22.2”W x 20.5”D (577.9 x 565.1 x 520.7 mm) | 31”H x 26”W x 24”D (787.4 x 660.4 x 609.6 mm) |
| Weight | 145.1 lbs (65.8 kg) | 297.6 lbs (135 kg) |
| Warranty | 3 | 3 |
| Cabinet Color | wood, custom | wood, custom |
| Country | Canada | Canada |
| Measurement Source | Data-bass | Manufacturer |
| Drivers | 21” (533mm) driver | 24” (610mm) driver |
| Inputs | XLR (balanced) | XLR (balanced) |
| XLR Input | Yes | Yes |
| RCA Input | No | No |
| TRS Input | No | No |
| Optical Input | No | No |
| Coaxial Input | No | No |
| USB Input | No | No |
| HDMI Input | No | No |
| AES Input | No | No |
| Aux Input | No | No |
Related Speaker Comparisons
More top alternatives to Funk Audio Ultra 24.0:
- Funk Audio Ultra 24.0 vs JTR Speakers Captivator S2
- Funk Audio Ultra 24.0 vs Power Sound Audio (PSA) V3600I
- JTR Speakers Growler (2015) vs Funk Audio Ultra 24.0
- Harbinger V2218S vs Funk Audio Ultra 24.0
- Funk Audio Classic 18.0 vs Funk Audio Ultra 24.0
Prices on this page were last checked October 7, 2026 at 9:25 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
- 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 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 Harbottle Audio C24 L2
- Funk Audio Custom 21.0 vs Monoprice Monolith 16 THX Ultra
- Funk Audio Custom 21.0 vs HSU Research VTF-3 MK5 HP
Funk Audio Ultra 24.0: $18,565 Funk Audio eBay
Same family: the Funk Audio Ultra 21.0LX (smaller subwoofer, ranked lower, rated 4.4/5).
Pros: Published CEA-2010 specifications list 120.0 dB at 20 Hz and 127.9 dB through 40-80 Hz. The sealed enclosure with 24” (610mm) driver has the headroom for demanding film bass in a large room.
Cons: The 787.4H x 660.4W x 609.6D mm cabinet and 135 kg mass make this a serious placement and moving commitment. A sealed cabinet still needs careful placement and calibration to avoid room-mode peaks.
Full Funk Audio Ultra 24.0 review and specifications →
| AES Input | No |
|---|---|
| Aux Input | No |
| CEA-2010-A Average (40-80Hz) | 127.9 dB |
| Cabinet Color | wood, custom |
| Coaxial Input | No |
| Country | Canada |
| Dimensions | 31”H x 26”W x 24”D (787.4 x 660.4 x 609.6 mm) |
| Drivers | 24” (610mm) driver |
| Enclosure | sealed |
| HDMI Input | No |
| Inputs | XLR (balanced) |
| Measurement Source | Manufacturer |
| Optical Input | No |
| Output SPL at 10 Hz | 101.0 dB |
| Output SPL at 12.5 Hz | 104.9 dB |
| Output SPL at 15 Hz | 111.8 dB |
| Output SPL at 20 Hz | 120.0 dB |
| Output SPL at 25 Hz | 122.0 dB |
| Output SPL at 31.5 Hz | 123.0 dB |
| Output SPL at 40 Hz | 127.1 dB |
| Output SPL at 50 Hz | 129.9 dB |
| Output SPL at 63 Hz | 127.6 dB |
| Output SPL at 80 Hz | 127.0 dB |
| Output SPL at 100 Hz | 128.2 dB |
| RCA Input | No |
| TRS Input | No |
| USB Input | No |
| Warranty | 3 |
| Weight | 297.6 lbs (135 kg) |
| XLR Input | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- These figures are manufacturer-specified rather than independently measured.
- Head-to-Head Comparisons
- Funk Audio Ultra 24.0 vs Power Sound Audio (PSA) V3600I
- Funk Audio Ultra 24.0 vs JTR Speakers Captivator S2
- Funk Audio Ultra 24.0 vs JTR Speakers Growler (2015)
- Funk Audio Ultra 24.0 vs Harbinger V2218S
- Funk Audio Ultra 24.0 vs Funk Audio Classic 18.0
- Funk Audio Ultra 24.0 vs Monoprice Monolith 16 THX Ultra
- Funk Audio Ultra 24.0 vs Rythmik FV25HP
- Funk Audio Ultra 24.0 vs Monoprice Monolith M-215
- See all 17 comparisons