HSU Research VTF-15H MK2 vs Monoprice Monolith M15-S

Last updated: August 9, 2026

Short answer: the HSU Research VTF-15H MK2 for the higher ranking, the Monoprice Monolith M15-S for the lower price. The HSU Research VTF-15H MK2 ranks #41 of 97 subwoofers at $1499. The Monoprice Monolith M15-S ranks #62 at $999, $500 cheaper.

What the HSU Research VTF-15H MK2 gets right: 15-inch ported driver delivers 121.8dB CEA-2010-A average from HSU Research’s long-running VTF series. The catch: Ported enclosure prone to room modes at certain frequencies, mid-large 50 kg size, and $1,500 price point.

Buy the HSU Research VTF-15H MK2 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

HSU Research VTF-15H MK2 Monoprice Monolith M15-S
Price$1,499$999
Ranked#41 of 97 in Large Powered Home Subwoofers (Over 75 lbs)#62 of 97 in Large Powered Home Subwoofers (Over 75 lbs)
Enclosureported, frontsealed
Output SPL at 15 Hz101.6 dB100.1 dB
Output SPL at 20 Hz108.4 dB105.6 dB
Output SPL at 25 Hz114.8 dB111.2 dB
Output SPL at 31.5 Hz119.4 dB115.2 dB
Output SPL at 40 Hz122.9 dB118.4 dB
Output SPL at 50 Hz122.5 dB119.3 dB
Output SPL at 63 Hz121.1 dB119.6 dB
Output SPL at 80 Hz120.5 dB118.9 dB
CEA-2010-A Average (40-80Hz)121.8 dB119.0 dB
Dimensions24.0"H x 18.0"W x 26.0"D (609.6 x 457.2 x 660.4 mm)23.5"H x 16.7"W x 19.7"D (596.9 x 424.2 x 500.4 mm)
Weight110 lbs / 49.9 kg80 lbs / 36.3 kg
Warranty7/2(+3)5
Cabinet Colorblack, wood-
CountryUnited StatesUnited States
Measurement SourceManufacturerManufacturer
Drivers15" (381mm) driver15" (381mm) driver
Output SPL at 100 Hz-119.1 dB
Output SPL at 125 Hz-118.9 dB

The Two Speakers In Full

HSU Research VTF-15H MK2: $1,499

HSU Research VTF-15H MK2 ranking card

Pros: 15-inch ported driver delivers 121.8dB CEA-2010-A average from HSU Research’s long-running VTF series.

Cons: Ported enclosure prone to room modes at certain frequencies, mid-large 50 kg size, and $1,500 price point.

Notes: Price includes shipping

CEA-2010-A Average (40-80Hz)121.8 dB
Cabinet Colorblack, wood
CountryUnited States
Dimensions24.0"H x 18.0"W x 26.0"D (609.6 x 457.2 x 660.4 mm)
Drivers15" (381mm) driver
Enclosureported, front
Measurement SourceManufacturer
Output SPL at 15 Hz101.6 dB
Output SPL at 20 Hz108.4 dB
Output SPL at 25 Hz114.8 dB
Output SPL at 31.5 Hz119.4 dB
Output SPL at 40 Hz122.9 dB
Output SPL at 50 Hz122.5 dB
Output SPL at 63 Hz121.1 dB
Output SPL at 80 Hz120.5 dB
Warranty7/2(+3)
Weight110 lbs / 49.9 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.