JTR Speakers Captivator 4000ULF vs Rythmik FV15HP

Short answer: the JTR Speakers Captivator 4000ULF on measured sound quality, the Rythmik FV15HP on price. The JTR Speakers Captivator 4000ULF ranks #6 of 110 subwoofers, rated 4.5/5, at $5699. The Rythmik FV15HP ranks #48, rated 4.2/5, at $2127, $3572 cheaper.

What the Rythmik FV15HP gets right: 15-inch ported driver reaches 122.0dB CEA-2010-A average, matching the output of subwoofers costing significantly more. The catch: Premium price ($1,770), ported design room gain dependency, and mid-to-large 52 kg (114.6 lbs) footprint.

Buy the JTR Speakers Captivator 4000ULF when sound quality outweighs the price for you, and the Rythmik FV15HP when the price outweighs sound quality instead.

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 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 Reaction Audio PV-15X
  • See all 15 comparisons

Rythmik FV15HP: $1,770 Rythmik Audio eBay

Pros: 15-inch ported driver reaches 122.0dB CEA-2010-A average, matching the output of subwoofers costing significantly more.

Cons: Premium price ($2127), ported design room gain dependency, and mid-to-large 52 kg footprint.

Full Rythmik FV15HP review and specifications →

AES Input	No
Aux Input	No
CEA-2010-A Average (40-80Hz)	122.0 dB
Cabinet Color	black, white
Coaxial Input	No
Country	United States
Dimensions	24.5"H x 18.2"W x 24.2"D (622.3 x 463.5 x 615.9 mm)
Drivers	15" (381mm) driver
Enclosure	ported, front
HDMI Input	No
Inputs	XLR (2), RCA (line/LFE)
Measurement Source	Audioholics
Optical Input	No
Output SPL at 12.5 Hz	92.8 dB
Output SPL at 15 Hz	105.1 dB
Output SPL at 20 Hz	111.1 dB
Output SPL at 25 Hz	116.1 dB
Output SPL at 31.5 Hz	120.0 dB
Output SPL at 40 Hz	122.5 dB
Output SPL at 50 Hz	122.1 dB
Output SPL at 63 Hz	121.8 dB
Output SPL at 80 Hz	121.4 dB
Output SPL at 100 Hz	121.2 dB
Output SPL at 125 Hz	121.1 dB
RCA Input	Yes
TRS Input	No
USB Input	No
Warranty	5/3
Weight	115.1 lbs (52.2 kg)
XLR Input	Yes

• Links
  • Rythmik FV15HP Website
• Reviews, Comparisons and Sound Samples
  • Independently measured by Audioholics; the published figures above come from this ASR subwoofer measurement thread.
• Head-to-Head Comparisons
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