JTR Speakers Captivator S2 vs Monoprice Monolith M15-S

Last updated: August 9, 2026

Short answer: the JTR Speakers Captivator S2 for the higher ranking, the Monoprice Monolith M15-S for the lower price. The JTR Speakers Captivator S2 ranks #7 of 97 subwoofers at $3995. The Monoprice Monolith M15-S ranks #62 at $999, $2996 cheaper.

Buy the JTR Speakers Captivator S2 if the ranking matters more than the price. Buy the Monoprice Monolith M15-S if the price matters more than the ranking.

Specifications Side By Side

JTR Speakers Captivator S2 Monoprice Monolith M15-S
Price$3995$999
Ranked#7 of 97 in Large Powered Home Subwoofers (Over 75 lbs)#62 of 97 in Large Powered Home Subwoofers (Over 75 lbs)
Enclosuresealedsealed
Output SPL at 10 Hz100.3 dB-
Output SPL at 12.5 Hz103.3 dB-
Output SPL at 15 Hz108.7 dB100.1 dB
Output SPL at 20 Hz115.1 dB105.6 dB
Output SPL at 25 Hz119.7 dB111.2 dB
Output SPL at 31.5 Hz124.8 dB115.2 dB
Output SPL at 40 Hz129.3 dB118.4 dB
Output SPL at 50 Hz130.3 dB119.3 dB
Output SPL at 63 Hz129.4 dB119.6 dB
Output SPL at 80 Hz128.5 dB118.9 dB
Output SPL at 100 Hz128.1 dB119.1 dB
Output SPL at 125 Hz128.0 dB118.9 dB
CEA-2010-A Average (40-80Hz)129.4 dB119.0 dB
Dimensions40.0"H x 21.0"W x 18.0"D (1016.0 x 533.4 x 457.2 mm)23.5"H x 16.7"W x 19.7"D (596.9 x 424.2 x 500.4 mm)
Weight220 lbs / 99.8 kg80 lbs / 36.3 kg
Warranty5/35
CountryUnited StatesUnited States
Measurement SourceData-bassManufacturer
Drivers2x 18" (457mm) drivers15" (381mm) driver

The Two Speakers In Full

JTR Speakers Captivator S2: $3995

JTR Speakers Captivator S2 ranking card

Notes: Replaced by “RS2”

CEA-2010-A Average (40-80Hz)129.4 dB
CountryUnited States
Dimensions40.0"H x 21.0"W x 18.0"D (1016.0 x 533.4 x 457.2 mm)
Drivers2x 18" (457mm) drivers
Enclosuresealed
Measurement SourceData-bass
Output SPL at 10 Hz100.3 dB
Output SPL at 12.5 Hz103.3 dB
Output SPL at 15 Hz108.7 dB
Output SPL at 20 Hz115.1 dB
Output SPL at 25 Hz119.7 dB
Output SPL at 31.5 Hz124.8 dB
Output SPL at 40 Hz129.3 dB
Output SPL at 50 Hz130.3 dB
Output SPL at 63 Hz129.4 dB
Output SPL at 80 Hz128.5 dB
Output SPL at 100 Hz128.1 dB
Output SPL at 125 Hz128.0 dB
Warranty5/3
Weight220 lbs / 99.8 kg

Monoprice Monolith M15-S: $999

Monoprice Monolith M15-S ranking card

Notes: Product # 35141

CEA-2010-A Average (40-80Hz)119.0 dB
CountryUnited States
Dimensions23.5"H x 16.7"W x 19.7"D (596.9 x 424.2 x 500.4 mm)
Drivers15" (381mm) driver
Enclosuresealed
Measurement SourceManufacturer
Output SPL at 15 Hz100.1 dB
Output SPL at 20 Hz105.6 dB
Output SPL at 25 Hz111.2 dB
Output SPL at 31.5 Hz115.2 dB
Output SPL at 40 Hz118.4 dB
Output SPL at 50 Hz119.3 dB
Output SPL at 63 Hz119.6 dB
Output SPL at 80 Hz118.9 dB
Output SPL at 100 Hz119.1 dB
Output SPL at 125 Hz118.9 dB
Warranty5
Weight80 lbs / 36.3 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.