HSU Research ULS-15 MK2 vs Monoprice SW-15

Last updated: September 19, 2026

Short answer: the HSU Research ULS-15 MK2 for a sealed, controlled design, the Monoprice SW-15 for cheap large-room output. The SW-15 is a 15-inch ported sub with 600W RMS (800W peak) and a Large-room Bassaholic rating, but it has a budget-tier design, ported room gain dependency, a 30 kg (66.1 lbs) mid-size cabinet and limited dynamic headroom. It costs $624.01 less than the ULS-15 MK2, whose sealed design delivers tight, accurate bass with low bloat.

HSU Research ULS-15 MK2 vs Monoprice SW-15

On the HSU Research ULS-15 MK2 side: Sealed design delivers tight, accurate bass with low bloat.

The case for the Monoprice SW-15: 15-inch ported with 600W RMS (800W peak) delivers Large-room Bassaholic rating. The tradeoff: Budget-tier design, ported room gain dependency, 30 kg (66.1 lbs) mid-size, and limited dynamic headroom.

Buy the HSU Research ULS-15 MK2 if sound quality is the priority over the price, or the Monoprice SW-15 if the price is the priority over sound quality.

Looking for alternatives? See the complete Subwoofers rankings.

Buy the HSU Research ULS-15 MK2 at HSU Research ($999.00) →Buy the Monoprice SW-15 at Amazon ($374.99) →

Specifications Side By Side

HSU Research ULS-15 MK2 Monoprice SW-15
Price$1,035$374.99
Ranked#3 of 145 in Medium Home Subwoofers (30-75 lbs)#13 of 145 in Medium Home Subwoofers (30-75 lbs)
Enclosuresealedported, bottom
Output SPL at 12.5 Hz93.7 dB-
Output SPL at 15 Hz98.0 dB90.0 dB
Output SPL at 20 Hz102.4 dB101.2 dB
Output SPL at 25 Hz107.7 dB106.3 dB
Output SPL at 31.5 Hz113.4 dB111.2 dB
Output SPL at 40 Hz118.3 dB116.0 dB
Output SPL at 50 Hz120.8 dB120.2 dB
Output SPL at 63 Hz121.2 dB120.5 dB
Output SPL at 80 Hz121.1 dB119.5 dB
Output SPL at 100 Hz120.7 dB-
Output SPL at 125 Hz120.7 dB-
CEA-2010-A Average (40-80Hz)120.3 dB119.0 dB
Dimensions19"H x 18"W x 19.5"D (482.6 x 457.2 x 495.3 mm)18.1"H x 21"W x 22.7"D (459.7 x 533.4 x 576.6 mm)
Weight65 lbs (29.5 kg)66.1 lbs (30.0 kg)
Warranty7/2(+3)1
Cabinet Colorblack, woodblack
CountryUnited StatesUnited States
Measurement SourceAudioholicsAudioholics
Frequency Response20-200Hz, ±1dB30-150Hz (-10dB)
Amplifier Power600W RMS / 2000W peak600W RMS / 800W peak
Crossover Frequency30-90Hz adjustable40-150Hz, 18dB/octave
Phase Control0°-180°0° or 180°
FeaturesQ control, sealed subwoofer, EQ1/EQ2 modes-
Drivers15" (381mm) driver15" (381mm) driver
Inputs-Stereo line level and speaker level
Buy the HSU Research ULS-15 MK2 at HSU Research ($999.00) →Buy the Monoprice SW-15 at Amazon ($374.99) →

More worthwhile head-to-heads for HSU Research ULS-15 MK2:

Prices on this page were last checked September 23, 2026 at 11:24 PM UTC. Product prices and availability are accurate as of that date/time 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.

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The Two Speakers In Full

HSU Research ULS-15 MK2: $1,035 HSU Research eBay

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.

Notes: Price includes shipping

Full HSU Research ULS-15 MK2 review and specifications →

Amplifier Power600W RMS / 2000W peak
CEA-2010-A Average (40-80Hz)120.3 dB
Cabinet Colorblack, wood
CountryUnited States
Crossover Frequency30-90Hz adjustable
Dimensions19"H x 18"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°
Warranty7/2(+3)
Weight65 lbs (29.5 kg)
Check current price at HSU Research ($999.00) →Search eBay for HSU Research ULS-15 MK2 →

Monoprice SW-15: $374.99 Amazon eBay

Monoprice SW-15 ranking card

Pros: 15-inch ported with 600W RMS (800W peak) delivers Large-room Bassaholic rating. Unrivaled mid-bass punch for $375. Strong output with clean control. Dual speaker-level inputs and 40-150Hz crossover for flexible hookup.

Cons: Budget-tier design, ported room gain dependency, 30 kg mid-size, and limited dynamic headroom.

Notes: Product # 41499

Full Monoprice SW-15 review and specifications →

Amplifier Power600W RMS / 800W peak
CEA-2010-A Average (40-80Hz)119.0 dB
Cabinet Colorblack
CountryUnited States
Crossover Frequency40-150Hz, 18dB/octave
Dimensions18.1"H x 21"W x 22.7"D (459.7 x 533.4 x 576.6 mm)
Drivers15" (381mm) driver
Enclosureported, bottom
Frequency Response30-150Hz (-10dB)
InputsStereo line level and speaker level
Measurement SourceAudioholics
Output SPL at 15 Hz90.0 dB
Output SPL at 20 Hz101.2 dB
Output SPL at 25 Hz106.3 dB
Output SPL at 31.5 Hz111.2 dB
Output SPL at 40 Hz116.0 dB
Output SPL at 50 Hz120.2 dB
Output SPL at 63 Hz120.5 dB
Output SPL at 80 Hz119.5 dB
Phase Control0° or 180°
Warranty1
Weight66.1 lbs (30.0 kg)
Check current price at Amazon ($374.99) →Search eBay for Monoprice SW-15 →