Monoprice Monolith M15-S vs Rythmik FV15HP

Last updated: August 9, 2026

Short answer: the Rythmik FV15HP for the higher ranking, the Monoprice Monolith M15-S for the lower price. The Rythmik FV15HP ranks #39 of 97 subwoofers at $1770. The Monoprice Monolith M15-S ranks #62 at $999, $771 cheaper.

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

Buy the Monoprice Monolith M15-S if the price matters more than the ranking. Buy the Rythmik FV15HP if the ranking matters more than the price.

Specifications Side By Side

Monoprice Monolith M15-S Rythmik FV15HP
Price$999$1,770
Ranked#62 of 97 in Large Powered Home Subwoofers (Over 75 lbs)#39 of 97 in Large Powered Home Subwoofers (Over 75 lbs)
Enclosuresealedported, front
Output SPL at 15 Hz100.1 dB105.1 dB
Output SPL at 20 Hz105.6 dB111.1 dB
Output SPL at 25 Hz111.2 dB116.1 dB
Output SPL at 31.5 Hz115.2 dB120.0 dB
Output SPL at 40 Hz118.4 dB122.5 dB
Output SPL at 50 Hz119.3 dB122.1 dB
Output SPL at 63 Hz119.6 dB121.8 dB
Output SPL at 80 Hz118.9 dB121.4 dB
Output SPL at 100 Hz119.1 dB121.2 dB
Output SPL at 125 Hz118.9 dB121.1 dB
CEA-2010-A Average (40-80Hz)119.0 dB122.0 dB
Dimensions23.5"H x 16.7"W x 19.7"D (596.9 x 424.2 x 500.4 mm)24.5"H x 18.25"W x 24.25"D (622.3 x 463.5 x 615.9 mm)
Warranty55/3
CountryUnited StatesUnited States
Measurement SourceManufacturerAudioholics
Weight80 lbs / 36.3 kg115.1 lbs / 52.2 kg
Drivers15" (381mm) driver15" (381mm) driver
Output SPL at 12.5 Hz-92.8 dB
Cabinet Color-black, white

The Two Speakers In Full

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

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.