JTR Speakers Captivator 218PRO vs JTR Speakers Captivator 4000ULF

Short answer: the JTR Speakers Captivator 218PRO. Both are rated 4.5/5 for sound quality (#16 and #6 of 143 subwoofers), and the JTR Speakers Captivator 218PRO costs $4,999 against $5,699 for the JTR Speakers Captivator 4000ULF, and with sound quality even, the cheaper one is the better buy.

The case for the JTR Speakers Captivator 218PRO: Two 18” neodymium drivers with 4000W, rated from 25Hz, for far more output than the JTR Speakers Captivator 212PRO. Watch for: No independent measurements yet, so its output can’t be compared with ranked subwoofers.

The case for the JTR Speakers Captivator 4000ULF: Independent CEA-2010 testing records 122.3 dB at 20 Hz and 130.8 dB through 40-80 Hz. The tradeoff: The 1041.4H x 520.7W x 1003.3D mm cabinet and 265 lbs (120.2 kg) mass make this a serious placement and moving commitment.

Buy the JTR Speakers Captivator 218PRO. Both are rated the same for sound quality, and it costs $700 less than the JTR Speakers Captivator 4000ULF.

Worth knowing: the JTR Speakers Captivator 218PRO has not been measured yet. Its rating is estimated from related models, with a likely range of 4.2 to 4.8, so treat this verdict as provisional.

Still deciding? The full Subwoofers rankings cover every ranked option.

Specifications Side By Side

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Prices on this page were last checked October 11, 2026 at 4:59 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 218PRO: $4,999 each Estimated JTR Speakers eBay

Same family: the JTR Speakers Captivator 212PRO (smaller subwoofer, rated 4.5/5) and the JTR Speakers Captivator 215PRO (smaller subwoofer, ranked higher, rated 4.5/5).

Pros: Two 18” neodymium drivers with 4000W, rated from 25Hz, for far more output than the JTR Speakers Captivator 212PRO.

Cons: No independent measurements yet, so its output can’t be compared with ranked subwoofers. At 83.9 kg it is very heavy and large, and it is ordered direct from JTR.

Full JTR Speakers Captivator 218PRO review and specifications →

Amplifier Power	4000W RMS
Country	USA
Dimensions	45”H x 22.5”W x 32”D (1143 x 572 x 813 mm)
Drivers	2x 18” neodymium subwoofer drivers (22 mm xmax)
Frequency Response	25Hz - 189Hz (±3dB, manufacturer specified)
Inputs	XLR in/out, RCA
Warranty	3 years
Weight	185 lbs (83.9 kg)

• Links
  • Official JTR Speakers Captivator 218PRO Product Page
• Reviews, Comparisons and Sound Samples
  • No independent measurement review is linked for this model; it is ranked from hands-on listening and comparison against similarly priced speakers.
• Head-to-Head Comparisons
  • JTR Speakers Captivator 218PRO vs Paradigm XR13
  • JTR Speakers Captivator 218PRO vs Perlisten Audio R18s

JTR Speakers Captivator 4000ULF: $5,699 each 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.
• Head-to-Head Comparisons
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