Short answer: the Monoprice SW-12. It ranks #5 of 145 subwoofers by sound quality at $230; the Klipsch SPL-120 ranks #18 and costs $429.99, so there is not much of a tradeoff to weigh.
What the Monoprice SW-12 offers: 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. Watch for: Entry-level build quality, ported enclosure room interaction, and lower 112.3 dB output capability.
What the Klipsch SPL-120 offers: 12-inch ported with 300W delivers room-filling bass hitting nearly 118dB max SPL. Clean accurate response across whole bass register with tight controlled response at high volumes. Wireless connectivity with optional WA-2 accessory. Watch for: No detailed measurement caveats are currently recorded.
Buy the Monoprice SW-12. It ranks higher for sound quality than the Klipsch SPL-120 and costs less, so the other one has nothing left to offer.
Looking for alternatives? See the complete Subwoofers rankings.
Specifications Side By Side
| Monoprice SW-12 | Klipsch SPL-120 | |
|---|---|---|
| Price | $230 | $429.99 |
| Ranked | #5 of 145 in Medium Home Subwoofers (30-75 lbs) | #18 of 145 in Medium Home Subwoofers (30-75 lbs) |
| Enclosure | ported, bottom | ported, front |
| Output SPL at 20 Hz | 102.7 dB | 97.9 dB |
| Output SPL at 25 Hz | 111.1 dB | 108.2 dB |
| Output SPL at 31.5 Hz | 115.2 dB | 113.5 dB |
| Output SPL at 40 Hz | 119.0 dB | 116.8 dB |
| Output SPL at 50 Hz | 119.7 dB | 119.8 dB |
| Output SPL at 63 Hz | 122.9 dB | 120.9 dB |
| Output SPL at 80 Hz | 123.0 dB | 121.2 dB |
| CEA-2010-A Average (40-80Hz) | 121.2 dB | 119.7 dB |
| Dimensions | 14.9"H x 18.3"W x 19.1"D (378.5 x 464.8 x 485.1 mm) | 17.7"H x 14.7"W x 19.9"D (450.8 x 372.9 x 504.7 mm) |
| Weight | 50.7 lbs (23.0 kg) | 45 lbs (20.4 kg) |
| Warranty | 1 | 5/2 |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Brent Butterworth | Brent Butterworth |
| Frequency Response | 35-150Hz, -10dB | 24-125Hz |
| Amplifier Power | 400W RMS / 600W peak | 300W RMS |
| Drivers | 12" (305mm) driver | 12" (305mm) driver |
| Output SPL at 16 Hz | 90.6 dB | 87.2 dB |
Related Speaker Comparisons
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- JTR Speakers Captivator 212PRO vs Monoprice SW-12
- MartinLogan Dynamo 1600X vs Monoprice SW-12
- HSU Research ULS-15 MK2 vs Monoprice SW-12
- Monoprice SW-12 vs Power Sound Audio (PSA) XV15
- Monoprice SW-12 vs Monoprice SW-15
Prices on this page were last checked September 16, 2026 at 12:41 AM 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
Monoprice SW-12: $230 Amazon eBay
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
Full Monoprice SW-12 review and specifications →
| Amplifier Power | 400W RMS / 600W peak |
|---|---|
| CEA-2010-A Average (40-80Hz) | 121.2 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) |
| Drivers | 12" (305mm) driver |
| Enclosure | ported, bottom |
| Frequency Response | 35-150Hz, -10dB |
| Measurement Source | Brent Butterworth |
| Output SPL at 16 Hz | 90.6 dB |
| Output SPL at 20 Hz | 102.7 dB |
| Output SPL at 25 Hz | 111.1 dB |
| Output SPL at 31.5 Hz | 115.2 dB |
| Output SPL at 40 Hz | 119.0 dB |
| Output SPL at 50 Hz | 119.7 dB |
| Output SPL at 63 Hz | 122.9 dB |
| Output SPL at 80 Hz | 123.0 dB |
| Warranty | 1 |
| Weight | 50.7 lbs (23.0 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by Brent Butterworth; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons
- Monoprice SW-12 vs HSU Research ULS-15 MK2
- Monoprice SW-12 vs MartinLogan Dynamo 1600X
- Monoprice SW-12 vs JTR Speakers Captivator 212PRO
- Monoprice SW-12 vs Power Sound Audio (PSA) XV15
- Monoprice SW-12 vs Monoprice SW-15
- Monoprice SW-12 vs SVS SB-3000
- Monoprice SW-12 vs Rythmik F12
- Monoprice SW-12 vs Power Sound Audio (PSA) XS15SE
- See all 19 comparisons
Klipsch SPL-120: $429.99 Amazon eBay
Pros: 12-inch ported with 300W delivers room-filling bass hitting nearly 118dB max SPL. Clean accurate response across whole bass register with tight controlled response at high volumes. Wireless connectivity with optional WA-2 accessory.
Full Klipsch SPL-120 review and specifications →
| Amplifier Power | 300W RMS |
|---|---|
| CEA-2010-A Average (40-80Hz) | 119.7 dB |
| Cabinet Color | black |
| Country | United States |
| Dimensions | 17.7"H x 14.7"W x 19.9"D (450.8 x 372.9 x 504.7 mm) |
| Drivers | 12" (305mm) driver |
| Enclosure | ported, front |
| Frequency Response | 24-125Hz |
| Measurement Source | Brent Butterworth |
| Output SPL at 16 Hz | 87.2 dB |
| Output SPL at 20 Hz | 97.9 dB |
| Output SPL at 25 Hz | 108.2 dB |
| Output SPL at 31.5 Hz | 113.5 dB |
| Output SPL at 40 Hz | 116.8 dB |
| Output SPL at 50 Hz | 119.8 dB |
| Output SPL at 63 Hz | 120.9 dB |
| Output SPL at 80 Hz | 121.2 dB |
| Warranty | 5/2 |
| Weight | 45 lbs (20.4 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by Brent Butterworth; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons
- Klipsch SPL-120 vs Rythmik F12
- Klipsch SPL-120 vs SVS SB-3000
- Klipsch SPL-120 vs Monoprice SW-15
- Klipsch SPL-120 vs HSU Research ULS-15 MK2
- Klipsch SPL-120 vs SVS SB-2000
- Klipsch SPL-120 vs MartinLogan Dynamo 1600X
- Klipsch SPL-120 vs SVS PB-1000 PRO
- Klipsch SPL-120 vs BIC America PL-300
- See all 11 comparisons