Short answer: the JTR Speakers Captivator 2400ULF on measured sound quality, the Funk Audio Classic 21.0L on price. The JTR Speakers Captivator 2400ULF ranks #31 of 97 subwoofers at $3600. The Funk Audio Classic 21.0L ranks #32 at $2995, $605 cheaper.
What the Funk Audio Classic 21.0L offers: Published CEA-2010 specifications list 114.0 dB at 20 Hz and 122.5 dB through 40-80 Hz. The sealed enclosure with 21” (533mm) driver has the headroom for demanding film bass in a large room. Watch for: The 800.1H x 660.4W x 609.6D mm cabinet and 70.3 kg mass make this a serious placement and moving commitment. A sealed cabinet still needs careful placement and calibration to avoid room-mode peaks.
What the JTR Speakers Captivator 2400ULF offers: Independent CEA-2010 testing records 115.6 dB at 20 Hz and 122.7 dB through 40-80 Hz. The ported, front enclosure with 18” (457mm) driver has the headroom for demanding film bass in a large room. Watch for: The 1041.4H x 520.7W x 571.5D mm cabinet and 74.8 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 Funk Audio Classic 21.0L if the price matters more than sound quality. Buy the JTR Speakers Captivator 2400ULF if sound quality matters more than the price.
Specifications Side By Side
| Funk Audio Classic 21.0L | JTR Speakers Captivator 2400ULF | |
|---|---|---|
| Price | $2995 | $3,600 |
| Ranked | #32 of 97 in Large Powered Home Subwoofers (Over 75 lbs) | #31 of 97 in Large Powered Home Subwoofers (Over 75 lbs) |
| Enclosure | sealed | ported, front |
| Output SPL at 10 Hz | 99.0 dB | 104.8 dB |
| Output SPL at 12.5 Hz | 102.0 dB | 109.0 dB |
| Output SPL at 15 Hz | 108.0 dB | 112.2 dB |
| Output SPL at 20 Hz | 114.0 dB | 115.6 dB |
| Output SPL at 25 Hz | 118.5 dB | 117.9 dB |
| Output SPL at 31.5 Hz | 122.0 dB | 121.8 dB |
| Output SPL at 40 Hz | 122.4 dB | 123.3 dB |
| Output SPL at 50 Hz | 123.3 dB | 123.3 dB |
| Output SPL at 63 Hz | 122.5 dB | 122.4 dB |
| Output SPL at 80 Hz | 122.0 dB | 121.6 dB |
| Output SPL at 100 Hz | 122.5 dB | 121.3 dB |
| CEA-2010-A Average (40-80Hz) | 122.5 dB | 122.7 dB |
| Dimensions | 31.5"H x 26"W x 24"D (800.1 x 660.4 x 609.6 mm) | 41"H x 20.5"W x 22.5"D (1041.4 x 520.7 x 571.5 mm) |
| Weight | 155 lbs / 70.3 kg | 164.9 lbs / 74.8 kg |
| Warranty | 3 | 5/3 |
| Cabinet Color | wood, custom | black, custom |
| Country | Canada | United States |
| Measurement Source | Manufacturer | Data-bass |
| Drivers | 21" (533mm) driver | 18" (457mm) driver |
| Output SPL at 125 Hz | - | 121.4 dB |
Related Speaker Comparisons
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- Power Sound Audio (PSA) XV30FSE vs Elemental Designs A7S-450
- JTR Speakers Captivator 118HT vs Paradigm Defiance X15
- MartinLogan Dynamo 1600X vs Paradigm Defiance X15
- Harbinger V2218S vs JTR Speakers Captivator 2400ULF
- Power Sound Audio (PSA) XS30SE vs Power Sound Audio (PSA) XV30F
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 21.0L: $2995 eBay
Pros: Published CEA-2010 specifications list 114.0 dB at 20 Hz and 122.5 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 800.1H x 660.4W x 609.6D mm cabinet and 70.3 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 Classic 21.0L review and specifications →
| CEA-2010-A Average (40-80Hz) | 122.5 dB |
|---|---|
| Cabinet Color | wood, custom |
| Country | Canada |
| Dimensions | 31.5"H x 26"W x 24"D (800.1 x 660.4 x 609.6 mm) |
| Drivers | 21" (533mm) driver |
| Enclosure | sealed |
| Measurement Source | Manufacturer |
| Output SPL at 10 Hz | 99.0 dB |
| Output SPL at 12.5 Hz | 102.0 dB |
| Output SPL at 15 Hz | 108.0 dB |
| Output SPL at 20 Hz | 114.0 dB |
| Output SPL at 25 Hz | 118.5 dB |
| Output SPL at 31.5 Hz | 122.0 dB |
| Output SPL at 40 Hz | 122.4 dB |
| Output SPL at 50 Hz | 123.3 dB |
| Output SPL at 63 Hz | 122.5 dB |
| Output SPL at 80 Hz | 122.0 dB |
| Output SPL at 100 Hz | 122.5 dB |
| Warranty | 3 |
| Weight | 155 lbs / 70.3 kg |
- Links
- Reviews, Comparisons and Sound Samples
JTR Speakers Captivator 2400ULF: $3,600 eBay
Pros: Independent CEA-2010 testing records 115.6 dB at 20 Hz and 122.7 dB through 40-80 Hz. The ported, front enclosure with 18” (457mm) driver has the headroom for demanding film bass in a large room.
Cons: The 1041.4H x 520.7W x 571.5D mm cabinet and 74.8 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 JTR Speakers Captivator 2400ULF review and specifications →
| CEA-2010-A Average (40-80Hz) | 122.7 dB |
|---|---|
| Cabinet Color | black, custom |
| Country | United States |
| Dimensions | 41"H x 20.5"W x 22.5"D (1041.4 x 520.7 x 571.5 mm) |
| Drivers | 18" (457mm) driver |
| Enclosure | ported, front |
| Measurement Source | Data-bass |
| Output SPL at 10 Hz | 104.8 dB |
| Output SPL at 12.5 Hz | 109.0 dB |
| Output SPL at 15 Hz | 112.2 dB |
| Output SPL at 20 Hz | 115.6 dB |
| Output SPL at 25 Hz | 117.9 dB |
| Output SPL at 31.5 Hz | 121.8 dB |
| Output SPL at 40 Hz | 123.3 dB |
| Output SPL at 50 Hz | 123.3 dB |
| Output SPL at 63 Hz | 122.4 dB |
| Output SPL at 80 Hz | 121.6 dB |
| Output SPL at 100 Hz | 121.3 dB |
| Output SPL at 125 Hz | 121.4 dB |
| Warranty | 5/3 |
| Weight | 164.9 lbs / 74.8 kg |
- Links
- Reviews, Comparisons and Sound Samples
- Head-to-Head Comparisons