JTR Speakers Captivator 4000ULF vs Rythmik FV15HP

Last updated: August 9, 2026

Short answer: the JTR Speakers Captivator 4000ULF for the higher ranking, the Rythmik FV15HP for the lower price. The JTR Speakers Captivator 4000ULF ranks #4 of 97 subwoofers at $5000. The Rythmik FV15HP ranks #39 at $1770, $3230 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 footprint.

Buy the JTR Speakers Captivator 4000ULF if the ranking matters more than the price. Buy the Rythmik FV15HP if the price matters more than the ranking.

Specifications Side By Side

JTR Speakers Captivator 4000ULF Rythmik FV15HP
Price$5,000$1,770
Ranked#4 of 97 in Large Powered Home Subwoofers (Over 75 lbs)#39 of 97 in Large Powered Home Subwoofers (Over 75 lbs)
Enclosureported, frontported, front
Output SPL at 10 Hz111.0 dB-
Output SPL at 12.5 Hz115.3 dB92.8 dB
Output SPL at 15 Hz119.3 dB105.1 dB
Output SPL at 20 Hz122.3 dB111.1 dB
Output SPL at 25 Hz126.1 dB116.1 dB
Output SPL at 31.5 Hz129.3 dB120.0 dB
Output SPL at 40 Hz130.7 dB122.5 dB
Output SPL at 50 Hz131.2 dB122.1 dB
Output SPL at 63 Hz130.9 dB121.8 dB
Output SPL at 80 Hz130.6 dB121.4 dB
Output SPL at 100 Hz130.5 dB121.2 dB
Output SPL at 125 Hz129.5 dB121.1 dB
CEA-2010-A Average (40-80Hz)130.8 dB122.0 dB
Dimensions41.0"H x 20.5"W x 39.5"D (1041.4 x 520.7 x 1003.3 mm)24.5"H x 18.25"W x 24.25"D (622.3 x 463.5 x 615.9 mm)
Weight265 lbs / 120.2 kg115.1 lbs / 52.2 kg
Warranty5/35/3
Cabinet Colorblack, customblack, white
CountryUnited StatesUnited States
Measurement SourceData-bassAudioholics
Drivers2x 18" (457mm) driver15" (381mm) driver

The Two Speakers In Full

JTR Speakers Captivator 4000ULF: $5,000

JTR Speakers Captivator 4000ULF ranking card

CEA-2010-A Average (40-80Hz)130.8 dB
Cabinet Colorblack, custom
CountryUnited States
Dimensions41.0"H x 20.5"W x 39.5"D (1041.4 x 520.7 x 1003.3 mm)
Drivers2x 18" (457mm) driver
Enclosureported, front
Measurement SourceData-bass
Output SPL at 10 Hz111.0 dB
Output SPL at 12.5 Hz115.3 dB
Output SPL at 15 Hz119.3 dB
Output SPL at 20 Hz122.3 dB
Output SPL at 25 Hz126.1 dB
Output SPL at 31.5 Hz129.3 dB
Output SPL at 40 Hz130.7 dB
Output SPL at 50 Hz131.2 dB
Output SPL at 63 Hz130.9 dB
Output SPL at 80 Hz130.6 dB
Output SPL at 100 Hz130.5 dB
Output SPL at 125 Hz129.5 dB
Warranty5/3
Weight265 lbs / 120.2 kg

Rythmik FV15HP: $1,770

Rythmik FV15HP ranking card

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

Cons: Premium price ($1,770), ported design room gain dependency, and mid-to-large 52 kg footprint.

CEA-2010-A Average (40-80Hz)122.0 dB
Cabinet Colorblack, white
CountryUnited States
Dimensions24.5"H x 18.25"W x 24.25"D (622.3 x 463.5 x 615.9 mm)
Drivers15" (381mm) driver
Enclosureported, front
Measurement SourceAudioholics
Output SPL at 12.5 Hz92.8 dB
Output SPL at 15 Hz105.1 dB
Output SPL at 20 Hz111.1 dB
Output SPL at 25 Hz116.1 dB
Output SPL at 31.5 Hz120.0 dB
Output SPL at 40 Hz122.5 dB
Output SPL at 50 Hz122.1 dB
Output SPL at 63 Hz121.8 dB
Output SPL at 80 Hz121.4 dB
Output SPL at 100 Hz121.2 dB
Output SPL at 125 Hz121.1 dB
Warranty5/3
Weight115.1 lbs / 52.2 kg

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Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC 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.