HSU Research ULS-15 MK2 vs Rythmik F12

Last updated: August 9, 2026

Short answer: the HSU Research ULS-15 MK2. It ranks #3 of 137 subwoofers at $1035; the Rythmik F12 ranks #51 and costs $1120, so there is not much of a tradeoff to weigh.

The case for the HSU Research ULS-15 MK2: Sealed design delivers tight, accurate bass with low bloat.

What the Rythmik F12 gets right: Sealed 12-inch servo with 370W RMS offers excellent value.

Buy the HSU Research ULS-15 MK2 if the ranking matters more than the price. Buy the Rythmik F12 if the price matters more than the ranking.

Specifications Side By Side

HSU Research ULS-15 MK2 Rythmik F12
Price$1,035$1,120
Ranked#3 of 137 in Medium Powered Home Subwoofers (30-75 lbs)#51 of 137 in Medium Powered Home Subwoofers (30-75 lbs)
Enclosuresealedsealed
Output SPL at 12.5 Hz93.7 dB-
Output SPL at 15 Hz98.0 dB95.0 dB
Output SPL at 20 Hz102.4 dB97.6 dB
Output SPL at 25 Hz107.7 dB100.7 dB
Output SPL at 31.5 Hz113.4 dB107.5 dB
Output SPL at 40 Hz118.3 dB112.3 dB
Output SPL at 50 Hz120.8 dB113.1 dB
Output SPL at 63 Hz121.2 dB114.4 dB
Output SPL at 80 Hz121.1 dB113.6 dB
Output SPL at 100 Hz120.7 dB-
Output SPL at 125 Hz120.7 dB-
CEA-2010-A Average (40-80Hz)120.3 dB113.3 dB
Dimensions19.0"H x 18.0"W x 19.5"D (482.6 x 457.2 x 495.3 mm)15.75"H x 15.75"W x 17.0"D (400.0 x 400.0 x 431.8 mm)
Weight65 lbs / 29.5 kg75 lbs / 34.0 kg
Warranty7/2(+3)5/3
Cabinet Colorblack, woodblack
CountryUnited StatesUnited States
Measurement SourceAudioholicsBrent Butterworth
Frequency Response20-200Hz, ±1dB14Hz extension
Power Output (Watts)600W RMS / 2000W peak370W RMS
Crossover30-90Hz adjustable-
Phase Control0°-180°-
FeaturesQ control, sealed subwoofer, EQ1/EQ2 modes-
Drivers15" (381mm) driver12" (305mm) driver

The Two Speakers In Full

HSU Research ULS-15 MK2: $1,035

HSU Research ULS-15 MK2 ranking card

Pros: Sealed design delivers tight, accurate bass with low bloat. 600W BASH amplifier. 30% less expensive and 20 lbs lighter than predecessor. Easy integration with Q and EQ controls. Great value in the 15” sub market at under $850 shipped.

Notes: Price includes shipping

CEA-2010-A Average (40-80Hz)120.3 dB
Cabinet Colorblack, wood
CountryUnited States
Crossover30-90Hz adjustable
Dimensions19.0"H x 18.0"W x 19.5"D (482.6 x 457.2 x 495.3 mm)
Drivers15" (381mm) driver
Enclosuresealed
FeaturesQ control, sealed subwoofer, EQ1/EQ2 modes
Frequency Response20-200Hz, ±1dB
Measurement SourceAudioholics
Output SPL at 12.5 Hz93.7 dB
Output SPL at 15 Hz98.0 dB
Output SPL at 20 Hz102.4 dB
Output SPL at 25 Hz107.7 dB
Output SPL at 31.5 Hz113.4 dB
Output SPL at 40 Hz118.3 dB
Output SPL at 50 Hz120.8 dB
Output SPL at 63 Hz121.2 dB
Output SPL at 80 Hz121.1 dB
Output SPL at 100 Hz120.7 dB
Output SPL at 125 Hz120.7 dB
Phase Control0°-180°
Power Output (Watts)600W RMS / 2000W peak
Warranty7/2(+3)
Weight65 lbs / 29.5 kg

Rythmik F12: $1,120

Rythmik F12 ranking card

Pros: Sealed 12-inch servo with 370W RMS offers excellent value. Very musical and can disappear in small rooms. Digs to 14Hz with excellent build quality and well-braced cabinet.

CEA-2010-A Average (40-80Hz)113.3 dB
Cabinet Colorblack
CountryUnited States
Dimensions15.75"H x 15.75"W x 17.0"D (400.0 x 400.0 x 431.8 mm)
Drivers12" (305mm) driver
Enclosuresealed
Frequency Response14Hz extension
Measurement SourceBrent Butterworth
Output SPL at 15 Hz95.0 dB
Output SPL at 20 Hz97.6 dB
Output SPL at 25 Hz100.7 dB
Output SPL at 31.5 Hz107.5 dB
Output SPL at 40 Hz112.3 dB
Output SPL at 50 Hz113.1 dB
Output SPL at 63 Hz114.4 dB
Output SPL at 80 Hz113.6 dB
Power Output (Watts)370W RMS
Warranty5/3
Weight75 lbs / 34.0 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.