JTR Speakers Captivator S2 vs JTR Speakers Captivator 2400ULF

Short answer: the JTR Speakers Captivator S2 if sound quality matters most, the JTR Speakers Captivator 2400ULF if price matters most. The JTR Speakers Captivator S2 ranks #9 of 110 subwoofers at $3995. The JTR Speakers Captivator 2400ULF ranks #40 at $3600, $395 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 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 JTR Speakers Captivator S2 when sound quality outweighs the price for you, and the JTR Speakers Captivator 2400ULF when the price outweighs sound quality instead.

Looking for alternatives? See the complete Subwoofers rankings.

Specifications Side By Side

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Prices on this page were last checked September 16, 2026 at 12:41 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
  • JTR Speakers Captivator S2 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
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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
  • JTR Speakers Captivator 2400ULF 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
  • JTR Speakers Captivator 2400ULF vs Funk Audio Classic 21.0L
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