Short answer: the Outlaw Audio Ultra-X12 for better sound quality, the Monoprice SW-15 for the lower price. The Outlaw Audio Ultra-X12 ranks #6 of 145 subwoofers at $999. The Monoprice SW-15 ranks #13 at $374.99, $624.01 cheaper.
What the Monoprice SW-15 offers: 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. Watch for: Budget-tier design, ported room gain dependency, 30 kg mid-size, and limited dynamic headroom.
What the Outlaw Audio Ultra-X12 offers: 12-inch ported with 350W RMS, 17Hz max extension earns Large Bassaholic rating. Innovative window-pane perimeter bracing design reduces resonance. Longer port than previous models. Second subwoofer output for multi-sub installations. Excellent value at $999. Watch for: No detailed measurement caveats are currently recorded.
Buy the Monoprice SW-15 when the price outweighs sound quality for you, and the Outlaw Audio Ultra-X12 when sound quality outweighs the price instead.
Looking for alternatives? See the complete Subwoofers rankings.
Specifications Side By Side
| Monoprice SW-15 | Outlaw Audio Ultra-X12 | |
|---|---|---|
| Price | $374.99 | $999 Discontinued |
| Ranked | #13 of 145 in Medium Home Subwoofers (30-75 lbs) | #6 of 145 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 |
| Discontinued | - | Yes |
Related Speaker Comparisons
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- Monoprice SW-15 vs Emotiva X-Ref 12
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- Monoprice SW-15 vs Starke Sound SW15
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Prices on this page were last checked September 14, 2026 at 1:47 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-15: $374.99 Amazon eBay
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 Power | 600W RMS / 800W peak |
|---|---|
| CEA-2010-A Average (40-80Hz) | 119.0 dB |
| Cabinet Color | black |
| Country | United States |
| Crossover Frequency | 40-150Hz, 18dB/octave |
| Dimensions | 18.1"H x 21"W x 22.7"D (459.7 x 533.4 x 576.6 mm) |
| Drivers | 15" (381mm) driver |
| Enclosure | ported, bottom |
| Frequency Response | 30-150Hz (-10dB) |
| Inputs | 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° |
| Warranty | 1 |
| Weight | 66.1 lbs (30.0 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by Audioholics; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons
- Monoprice SW-15 vs Power Sound Audio (PSA) XV15SEICE-BASE
- Monoprice SW-15 vs SVS SB-3000
- Monoprice SW-15 vs Power Sound Audio (PSA) XS15
- Monoprice SW-15 vs Power Sound Audio (PSA) XV15-BASE
- Monoprice SW-15 vs Paradigm Defiance X12
- Monoprice SW-15 vs Power Sound Audio (PSA) XS15-BASE
- Monoprice SW-15 vs Power Sound Audio (PSA) XV15
- Monoprice SW-15 vs Klipsch SPL-120
- See all 72 comparisons
Outlaw Audio Ultra-X12: $999 Discontinued eBay
Pros: 12-inch ported with 350W RMS, 17Hz max extension earns Large Bassaholic rating. Innovative window-pane perimeter bracing design reduces resonance. Longer port than previous models. Second subwoofer output for multi-sub installations. Excellent value at $999.
Cons: Discontinued.
Full Outlaw Audio Ultra-X12 review and specifications →
| Amplifier Power | 350W RMS |
|---|---|
| CEA-2010-A Average (40-80Hz) | 120.5 dB (avg of 3/4 bands) |
| Cabinet Color | black |
| Country | United States |
| Dimensions | 21.3"H x 16"W x 23"D (539.8 x 406.4 x 584.2 mm) |
| Discontinued | Yes |
| Drivers | 12" (305mm) driver |
| Enclosure | ported, bottom |
| Frequency Response | 19-179Hz, ±3dB |
| Measurement Source | Brent Butterworth |
| Output SPL at 20 Hz | 108.3 dB |
| Output SPL at 25 Hz | 115.0 dB |
| Output SPL at 31.5 Hz | 116.1 dB |
| Output SPL at 40 Hz | 117.8 dB |
| Output SPL at 50 Hz | 121.4 dB |
| Output SPL at 63 Hz | 122.3 dB |
| Warranty | 3 |
| Weight | 65.9 lbs (29.9 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