Short answer: the Monoprice SW-15, if you are buying new. The Outlaw Audio Ultra-X12 ranks higher than it (#7 vs #14 of 212 subwoofers, 4.2/5 vs 4.1/5) but is discontinued, so only consider it used; the Monoprice SW-15 is still sold new at $499.99.
Why pick the Monoprice SW-15: A big 15 inch subwoofer with powerful, punchy bass at a budget price, great for movies in a large room. Watch for: Budget-tier design, ported room gain dependency, 66.1 lbs (30 kg) mid-size, and limited dynamic headroom.
The case for the Outlaw Audio Ultra-X12: A great value down ported 12 inch subwoofer with very deep bass and a second output for multi-sub setups, now discontinued. The tradeoff: At 65.9 lbs (29.9 kg) and 539.8H x 406.4W x 584.2D mm it is a large ported cabinet that needs space and is heavy to move.
Buy the Monoprice SW-15 if you want one new; the Outlaw Audio Ultra-X12 is discontinued, so only look for it used.
Looking for alternatives? See the complete Subwoofers rankings.
A big 15 inch subwoofer with powerful, punchy bass at a budget price, great for movies in a large room.
A great value down ported 12 inch subwoofer with very deep bass and a second output for multi-sub setups, now discontinued.
Prices on this page were last checked October 29, 2026 at 4:42 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-15 | Outlaw Audio Ultra-X12 | |
|---|---|---|
| Price | $499.99 | $999 Discontinued |
| Ranked | #14 of 212 in Medium Home Subwoofers (30-75 lbs) | #7 of 212 in Medium Home Subwoofers (30-75 lbs) |
| Enclosure | ported, bottom | ported, bottom |
| Output SPL at 15 Hz | 90.0 dB | - |
| Output SPL at 20 Hz | 101.2 dB | 108.3 dB |
| Output SPL at 25 Hz | 106.3 dB | 115.0 dB |
| Output SPL at 31.5 Hz | 111.2 dB | 116.1 dB |
| Output SPL at 40 Hz | 116.0 dB | 117.8 dB |
| Output SPL at 50 Hz | 120.2 dB | 121.4 dB |
| Output SPL at 63 Hz | 120.5 dB | 122.3 dB |
| Output SPL at 80 Hz | 119.5 dB | - |
| CEA-2010-A Average (40-80Hz) | 119.0 dB | 120.5 dB (avg of 3/4 bands) |
| Dimensions | 18.1”H x 21”W x 22.7”D (459.7 x 533.4 x 576.6 mm) | 21.3”H x 16”W x 23”D (539.8 x 406.4 x 584.2 mm) |
| Weight | 66.1 lbs (30.0 kg) | 65.9 lbs (29.9 kg) |
| Warranty | 1 | 3 |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Audioholics | Brent Butterworth |
| Frequency Response | 30-150Hz (-10dB) | 19-179Hz, ±3dB |
| Amplifier Power | 600W RMS / 800W peak | 350W RMS |
| Crossover Frequency | 40-150Hz, 18dB/octave | - |
| Phase Control | 0° or 180° | - |
| Inputs | Stereo line level and speaker level | - |
| Drivers | 15” (381mm) driver | 12” (305mm) driver |
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