Short answer: the Pro Audio Technology LFC-24sm for better sound quality, the JTR Speakers Captivator S2 for the lower price. The Pro Audio Technology LFC-24sm ranks #4 of 110 subwoofers at $10000. The JTR Speakers Captivator S2 ranks #9 at $3995, $6005 cheaper.
What the JTR Speakers Captivator S2 offers: Independent CEA-2010 testing records 115.1 dB at 20 Hz and 129.4 dB through 40-80 Hz. The sealed enclosure with 2x 18” (457mm) drivers has the headroom for demanding film bass in a large room. Watch for: The 1016.0H x 533.4W x 457.2D mm cabinet and 99.8 kg mass make this a serious placement and moving commitment. A sealed cabinet still needs careful placement and calibration to avoid room-mode peaks.
What the Pro Audio Technology LFC-24sm offers: Independent CEA-2010 testing records 123.7 dB at 20 Hz and 135.5 dB (avg of 3/4 bands) through 40-80 Hz. The ported, front enclosure with 24” (610mm) driver is best suited to demanding film bass in a large room. Watch for: The 660.4H x 1536.7W x 533.4D mm cabinet and 120.7 kg mass still need deliberate placement and calibration.
Buy the JTR Speakers Captivator S2 when the price outweighs sound quality for you, and the Pro Audio Technology LFC-24sm when sound quality outweighs the price instead.
Still deciding? The full Subwoofers rankings cover every ranked option.
Specifications Side By Side
| JTR Speakers Captivator S2 | Pro Audio Technology LFC-24sm | |
|---|---|---|
| Price | $3995 | $10,000 Passive |
| Ranked | #9 of 110 in Large Home Subwoofers (Over 75 lbs) | #4 of 110 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | sealed | ported, front |
| Output SPL at 10 Hz | 100.3 dB | - |
| Output SPL at 12.5 Hz | 103.3 dB | - |
| Output SPL at 15 Hz | 108.7 dB | - |
| Output SPL at 20 Hz | 115.1 dB | 123.7 dB |
| Output SPL at 25 Hz | 119.7 dB | 131.4 dB |
| Output SPL at 31.5 Hz | 124.8 dB | 133.6 dB |
| Output SPL at 40 Hz | 129.3 dB | 135.4 dB |
| Output SPL at 50 Hz | 130.3 dB | 136.0 dB |
| Output SPL at 63 Hz | 129.4 dB | 135.2 dB |
| Output SPL at 80 Hz | 128.5 dB | - |
| Output SPL at 100 Hz | 128.1 dB | - |
| Output SPL at 125 Hz | 128.0 dB | - |
| CEA-2010-A Average (40-80Hz) | 129.4 dB | 135.5 dB (avg of 3/4 bands) |
| Dimensions | 40"H x 21"W x 18"D (1016.0 x 533.4 x 457.2 mm) | 26"H x 60.5"W x 21"D (660.4 x 1536.7 x 533.4 mm) |
| Weight | 220 lbs (99.8 kg) | 266.1 lbs (120.7 kg) |
| Warranty | 5/3 | - |
| Country | United States | United States |
| Measurement Source | Data-bass | Brent Butterworth |
| Drivers | 2x 18" (457mm) drivers | 24" (610mm) driver |
| Passive | - | Yes |
| Cabinet Color | - | black |
Related Speaker Comparisons
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- JTR Speakers Growler (2015) vs Pro Audio Technology LFC-24sm
- Danley Sound Labs DTS10 vs Pro Audio Technology LFC-24sm
- Monoprice Monolith 16 THX Ultra vs Pro Audio Technology LFC-24sm
- Reaction Audio PV-15X vs Pro Audio Technology LFC-24sm
Prices on this page were last checked September 14, 2026 at 1:47 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
JTR Speakers Captivator S2: $3995 eBay
Pros: Independent CEA-2010 testing records 115.1 dB at 20 Hz and 129.4 dB through 40-80 Hz. The sealed enclosure with 2x 18” (457mm) drivers has the headroom for demanding film bass in a large room.
Cons: The 1016.0H x 533.4W x 457.2D mm cabinet and 99.8 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: Replaced by “RS2”
Full JTR Speakers Captivator S2 review and specifications →
| CEA-2010-A Average (40-80Hz) | 129.4 dB |
|---|---|
| Country | United States |
| Dimensions | 40"H x 21"W x 18"D (1016.0 x 533.4 x 457.2 mm) |
| Drivers | 2x 18" (457mm) drivers |
| Enclosure | sealed |
| Measurement Source | Data-bass |
| Output SPL at 10 Hz | 100.3 dB |
| Output SPL at 12.5 Hz | 103.3 dB |
| Output SPL at 15 Hz | 108.7 dB |
| Output SPL at 20 Hz | 115.1 dB |
| Output SPL at 25 Hz | 119.7 dB |
| Output SPL at 31.5 Hz | 124.8 dB |
| Output SPL at 40 Hz | 129.3 dB |
| Output SPL at 50 Hz | 130.3 dB |
| Output SPL at 63 Hz | 129.4 dB |
| Output SPL at 80 Hz | 128.5 dB |
| Output SPL at 100 Hz | 128.1 dB |
| Output SPL at 125 Hz | 128.0 dB |
| Warranty | 5/3 |
| Weight | 220 lbs (99.8 kg) |
- 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
- JTR Speakers Captivator S2 vs Power Sound Audio (PSA) T18
- JTR Speakers Captivator S2 vs Power Sound Audio (PSA) V3600I
- JTR Speakers Captivator S2 vs Funk Audio Ultra 24.0
- JTR Speakers Captivator S2 vs JTR Speakers Captivator 215PRO
- JTR Speakers Captivator S2 vs JTR Speakers Captivator 4000ULF
- JTR Speakers Captivator S2 vs Power Sound Audio (PSA) TRIAX
- JTR Speakers Captivator S2 vs JTR Speakers Growler (2015)
- JTR Speakers Captivator S2 vs Danley Sound Labs DTS10
- See all 23 comparisons
Pro Audio Technology LFC-24sm: $10,000 Passive eBay
Pros: Independent CEA-2010 testing records 123.7 dB at 20 Hz and 135.5 dB (avg of 3/4 bands) through 40-80 Hz. The ported, front enclosure with 24” (610mm) driver is best suited to demanding film bass in a large room.
Cons: The 660.4H x 1536.7W x 533.4D mm cabinet and 120.7 kg mass still need deliberate placement and calibration.
Full Pro Audio Technology LFC-24sm review and specifications →
| CEA-2010-A Average (40-80Hz) | 135.5 dB (avg of 3/4 bands) |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 26"H x 60.5"W x 21"D (660.4 x 1536.7 x 533.4 mm) |
| Drivers | 24" (610mm) driver |
| Enclosure | ported, front |
| Measurement Source | Brent Butterworth |
| Output SPL at 20 Hz | 123.7 dB |
| Output SPL at 25 Hz | 131.4 dB |
| Output SPL at 31.5 Hz | 133.6 dB |
| Output SPL at 40 Hz | 135.4 dB |
| Output SPL at 50 Hz | 136.0 dB |
| Output SPL at 63 Hz | 135.2 dB |
| Passive | Yes |
| Weight | 266.1 lbs (120.7 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by Brent Butterworth; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons
- Pro Audio Technology LFC-24sm vs WW Speaker Cabinets X21 - B&C 21DS115-4
- Pro Audio Technology LFC-24sm vs JTR Speakers Growler (2015)
- Pro Audio Technology LFC-24sm vs Danley Sound Labs DTS10
- Pro Audio Technology LFC-24sm vs Monoprice Monolith 16 THX Ultra
- Pro Audio Technology LFC-24sm vs Reaction Audio PV-15X
- Pro Audio Technology LFC-24sm vs JBL 4645C
- Pro Audio Technology LFC-24sm vs Chase Home Theater SS18.1
- Pro Audio Technology LFC-24sm vs HSU Research VTF-3 MK5 HP