JTR Speakers Captivator 4000ULF vs Reaction Audio PV-15X

Short answer: the JTR Speakers Captivator 4000ULF on measured sound quality, the Reaction Audio PV-15X on price. The JTR Speakers Captivator 4000ULF ranks #6 of 110 subwoofers, rated 4.5/5, at $5699. The Reaction Audio PV-15X ranks #21, rated 4.4/5, at $1999, $3700 cheaper.

What the Reaction Audio PV-15X gets right: 15-inch ported driver delivers 126.2dB CEA-2010-A average from a purpose-built cinema-style cabinet. The tradeoff: Passive design requires a separate external amplifier and weighs 68 kg (149.9 lbs).

One note: the Reaction Audio PV-15X is no longer sold new, but at #21 of 110 subwoofers by sound quality it still outranks most current models, so used is worth considering.

Buy the JTR Speakers Captivator 4000ULF when sound quality outweighs the price for you, and the Reaction Audio PV-15X 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 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.
• Head-to-Head Comparisons
  • JTR Speakers Captivator 4000ULF vs JTR Speakers Captivator 215PRO
  • JTR Speakers Captivator 4000ULF vs Power Sound Audio (PSA) TRIAX
  • JTR Speakers Captivator 4000ULF vs Power Sound Audio (PSA) T18
  • JTR Speakers Captivator 4000ULF vs JTR Speakers Captivator S2
  • JTR Speakers Captivator 4000ULF vs JTR Speakers Orbit Shifter LFU
  • JTR Speakers Captivator 4000ULF vs JTR Speakers Orbit Shifter PRO
  • JTR Speakers Captivator 4000ULF vs Monoprice Monolith 16 THX Ultra
  • JTR Speakers Captivator 4000ULF vs Monoprice Monolith M-215
  • See all 15 comparisons

Reaction Audio PV-15X: $1999 Discontinued eBay

Pros: 15-inch ported driver delivers 126.2dB CEA-2010-A average from a purpose-built cinema-style cabinet.

Cons: Passive design requires a separate external amplifier and weighs 68 kg. Discontinued.

Full Reaction Audio PV-15X review and specifications →

CEA-2010-A Average (40-80Hz)	126.2 dB
Dimensions	18"H x 22"W x 29"D (457.2 x 558.8 x 736.6 mm)
Discontinued	Yes
Drivers	15" (381mm) driver
Enclosure	ported, rear
Measurement Source	Data-bass
Output SPL at 15 Hz	105.3 dB
Output SPL at 20 Hz	111.3 dB
Output SPL at 25 Hz	116.1 dB
Output SPL at 31.5 Hz	119.8 dB
Output SPL at 40 Hz	125.3 dB
Output SPL at 50 Hz	126.8 dB
Output SPL at 63 Hz	126.1 dB
Output SPL at 80 Hz	126.5 dB
Output SPL at 100 Hz	126.4 dB
Output SPL at 125 Hz	126.1 dB
Weight	149.9 lbs (68 kg)

• 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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