JTR Speakers Captivator 4000ULF vs JTR Speakers Captivator S2

Short answer: the JTR Speakers Captivator S2. Both are rated 4.5/5 for sound quality (#9 and #6 of 110 subwoofers), and the JTR Speakers Captivator S2 costs $3995 against $5699 for the JTR Speakers Captivator 4000ULF, with sound quality a draw, the lower price decides it.

Buy the JTR Speakers Captivator S2. Both are rated the same for sound quality, and it costs $1704 less than the JTR Speakers Captivator 4000ULF.

Want more options? Browse the full Subwoofers rankings.

Specifications Side By Side

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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

JTR Speakers Captivator 4000ULF: $5,000 JTR Speakers eBay

Pros: Independent CEA-2010 testing records 122.3 dB at 20 Hz and 130.8 dB through 40-80 Hz. The ported, front enclosure with 2x 18” (457mm) driver has the headroom for demanding film bass in a large room.

Cons: The 1041.4H x 520.7W x 1003.3D mm cabinet and 120.2 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 4000ULF review and specifications →

AES Input	No
Aux Input	No
CEA-2010-A Average (40-80Hz)	130.8 dB
Cabinet Color	black, custom
Coaxial Input	No
Country	United States
Dimensions	41"H x 20.5"W x 39.5"D (1041.4 x 520.7 x 1003.3 mm)
Drivers	2x 18" (457mm) driver
Enclosure	ported, front
HDMI Input	No
Inputs	XLR, RCA
Measurement Source	Data-bass
Optical Input	No
Output SPL at 10 Hz	111.0 dB
Output SPL at 12.5 Hz	115.3 dB
Output SPL at 15 Hz	119.3 dB
Output SPL at 20 Hz	122.3 dB
Output SPL at 25 Hz	126.1 dB
Output SPL at 31.5 Hz	129.3 dB
Output SPL at 40 Hz	130.7 dB
Output SPL at 50 Hz	131.2 dB
Output SPL at 63 Hz	130.9 dB
Output SPL at 80 Hz	130.6 dB
Output SPL at 100 Hz	130.5 dB
Output SPL at 125 Hz	129.5 dB
RCA Input	Yes
TRS Input	No
USB Input	No
Warranty	5/3
Weight	265 lbs (120.2 kg)
XLR Input	Yes

• Links
  • JTR Speakers Captivator 4000ULF Website
• Reviews, Comparisons and Sound Samples
  • Independently measured by Data-bass; the published figures above come from this ASR subwoofer measurement thread.
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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 →

AES Input	No
Aux Input	No
CEA-2010-A Average (40-80Hz)	129.4 dB
Coaxial Input	No
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
HDMI Input	No
Inputs	XLR (balanced), RCA
Measurement Source	Data-bass
Optical Input	No
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
RCA Input	Yes
TRS Input	No
USB Input	No
Warranty	5/3
Weight	220 lbs (99.8 kg)
XLR Input	Yes

• 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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