Short answer: the Monoprice SW-12. It ranks #6 of 212 subwoofers by sound quality, rated 4.2/5, at $364.99; the Klipsch SPL-120 ranks #19, rated 4.1/5, and costs $429.99, so there is not much of a tradeoff to weigh.
What the Monoprice SW-12 does well: A budget 12 inch subwoofer that hits hard with clean, tight bass and easy connections. Watch for: Entry-level build quality, ported enclosure room interaction, and lower 112.3 dB output capability.
What the Klipsch SPL-120 does well: An affordable 12 inch ported subwoofer with room filling, clean bass and optional wireless connection. The catch: Port chuffing is the known flaw: testers could not run it past about 60 to 70% volume before the noise became bothersome, a problem Klipsch fixed in the newer Klipsch RP-1200SW.
Buy the Monoprice SW-12. It is rated higher for sound quality than the Klipsch SPL-120 and costs less, which makes it the one to get unless you need something the other one does better.
Looking for alternatives? See the complete Subwoofers rankings.
A budget 12 inch subwoofer that hits hard with clean, tight bass and easy connections.
An affordable 12 inch ported subwoofer with room filling, clean bass and optional wireless connection.
Prices on this page were last checked October 31, 2026 at 7:11 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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Specifications Side By Side
| Monoprice SW-12 | Klipsch SPL-120 | |
|---|---|---|
| Price | $364.99 | $429.99 |
| Ranked | #6 of 212 in Medium Home Subwoofers (30-75 lbs) | #19 of 212 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 |
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