Monoprice SW-12 vs SW-15

Short answer: the SW-15, and it isn’t close on value. $145 more buys 3.8 dB of CEA-2010-A average output, 4.5 dB more at 20 Hz, and a jump from #32 to #8 in a 137-subwoofer class.

The numbers. The SW-15 measures 119.0 dB average and 101.2 dB at 20 Hz. The SW-12 measures 115.2 dB and 96.7 dB. Both are bottom-ported. In practice the SW-15 is the better subwoofer in every way that a subwoofer is judged, and both are outstanding for what they cost — the SW-15 out-measures subwoofers at three times its price.

The real question is size, not money. The SW-15 is a 15” driver in a 30 kg cabinet; the SW-12 is a 12” in 23 kg. Neither is small, but the SW-15 is genuinely large and needs to be planned for rather than tucked away.

Buy the SW-12 if: the room is small, the cabinet has to fit somewhere specific, or you’re in an apartment where the deepest output would only annoy neighbours. In a small room, room gain does much of the deep work anyway — see best subwoofers for small rooms.

Buy the SW-15 if the space exists. It is one of the best value subwoofers measured anywhere.

And consider buying two SW-12s instead of one SW-15. Two cost $460 against $375, and two subwoofers in different positions average out room modes across every seat, which is a larger real-world improvement than the output difference between these two. The full argument is in the subwoofer buyer’s guide.

Last updated: August 07, 2026

Specifications Side By Side

The Two Speakers In Full

Monoprice SW-12: $230 Amazon

Pros: 12-inch ported with 400W RMS (600W peak) on a budget at just $230. Hits hard with clean tight transient response. Variable crossover and volume controls for setup flexibility. Speaker-level and line-level inputs for easy integration.

Cons: Entry-level build quality, ported enclosure room interaction, and lower 112.3 dB output capability.

Notes: Product # 41498

CEA-2010-A Average (40-80Hz)	115.2 dB
Cabinet Color	black
Country	United States
Dimensions	14.9"H x 18.3"W x 19.1"D (378.5 x 464.8 x 485.1 mm)
Driver	12" (305mm) driver
Driver(s)	(1) 12 inch
Enclosure	ported, bottom
Frequency Response	35–150Hz, -10dB
Measurement Source	Brent Butterworth
Output SPL at 15 Hz	84.6 dB
Output SPL at 20 Hz	96.7 dB
Output SPL at 25 Hz	105.1 dB
Output SPL at 31.5 Hz	109.2 dB
Output SPL at 40 Hz	113.0 dB
Output SPL at 50 Hz	113.7 dB
Output SPL at 63 Hz	116.9 dB
Output SPL at 80 Hz	117.0 dB
Power Output (Watts)	400W RMS / 600W peak
Warranty	1
Weight	50.7 lbs / 23.0 kg

• Links
  • Monoprice SW-12 Website
  • Reddit Search for Monoprice SW-12
  • Direct Speakerranking Link

Monoprice SW-15: $374.99 Amazon

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

CEA-2010-A Average (40-80Hz)	119.0 dB
Cabinet Color	black
Country	United States
Crossover	40–150Hz, 18dB/octave
Dimensions	18.1"H x 21.0"W x 22.7"D (459.7 x 533.4 x 576.6 mm)
Driver	15" (381mm) driver
Driver(s)	(1) 15 inch
Enclosure	ported, bottom
Frequency Response	30–150Hz (-10dB)
Input Connections	Stereo line level and speaker level
Measurement Source	Audioholics
Output SPL at 15 Hz	90.0 dB
Output SPL at 20 Hz	101.2 dB
Output SPL at 25 Hz	106.3 dB
Output SPL at 31.5 Hz	111.2 dB
Output SPL at 40 Hz	116.0 dB
Output SPL at 50 Hz	120.2 dB
Output SPL at 63 Hz	120.5 dB
Output SPL at 80 Hz	119.5 dB
Phase Control	0° or 180°
Power Output (Watts)	600W RMS / 800W peak
Warranty	1
Weight	66.1 lbs / 30.0 kg

• Head-to-Head Comparisons
  • Monoprice SW-15 vs SVS SB-1000 PRO
• Links
  • Monoprice SW-15 Website
  • Reddit Search for Monoprice SW-15
  • Direct Speakerranking Link

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Product prices and availability were last checked August 7, 2026 at 5:43 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.