Short answer: the XTZ Sound 99 W12S. It ranks #37 of 137 subwoofers at $1499; the Monoprice Monolith M-15 V2 ranks #55 and costs $1500, so there is not much of a tradeoff to weigh.
The case for the XTZ Sound 99 W12S: 12-inch ported with Bang & Olufsen ICEpower half-kilowatt amplification.
Buy the Monoprice Monolith M-15 V2 if the price matters more than the ranking. Buy the XTZ Sound 99 W12S if the ranking matters more than the price.
Specifications Side By Side
| Monoprice Monolith M-15 V2 | XTZ Sound 99 W12S | |
|---|---|---|
| Price | $1,500 | $1499 |
| Ranked | #55 of 97 in Large Powered Home Subwoofers (Over 75 lbs) | #37 of 137 in Medium Powered Home Subwoofers (30-75 lbs) |
| Enclosure | ported, front | ported, rear |
| Output SPL at 12.5 Hz | 91.0 dB | - |
| Output SPL at 15 Hz | 106.3 dB | - |
| Output SPL at 20 Hz | 112.6 dB | 74.0 dB |
| Output SPL at 25 Hz | 116.6 dB | 86.5 dB |
| Output SPL at 31.5 Hz | 119.5 dB | 97.7 dB |
| Output SPL at 40 Hz | 120.9 dB | 108.3 dB |
| Output SPL at 50 Hz | 120.6 dB | 114.9 dB |
| Output SPL at 63 Hz | 120.0 dB | 117.3 dB |
| Output SPL at 80 Hz | 118.7 dB | 117.4 dB |
| Output SPL at 100 Hz | 120.1 dB | - |
| Output SPL at 125 Hz | 120.2 dB | - |
| CEA-2010-A Average (40-80Hz) | 120.0 dB | 114.5 dB |
| Dimensions | 28.7"H x 17.7"W x 26.8"D (729.0 x 449.6 x 680.7 mm) | 19.65"H x 13.77"W x 15.75"D (499.1 x 349.8 x 400.0 mm) |
| Weight | 132.9 lbs / 60.3 kg | 67.2 lbs / 30.5 kg |
| Warranty | 5 | - |
| Cabinet Color | black | - |
| Country | United States | Sweden |
| Measurement Source | Manufacturer | Ilkka Rissanen |
| Drivers | 15" (381mm) driver | 12" (305mm) driver |
| Frequency Response | - | Not fully specified |
| Power Output (Watts) | - | Not fully specified |
The Two Speakers In Full
Monoprice Monolith M-15 V2: $1,500 Amazon
Notes: Product # 42851
| CEA-2010-A Average (40-80Hz) | 120.0 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 28.7"H x 17.7"W x 26.8"D (729.0 x 449.6 x 680.7 mm) |
| Drivers | 15" (381mm) driver |
| Enclosure | ported, front |
| Measurement Source | Manufacturer |
| Output SPL at 12.5 Hz | 91.0 dB |
| Output SPL at 15 Hz | 106.3 dB |
| Output SPL at 20 Hz | 112.6 dB |
| Output SPL at 25 Hz | 116.6 dB |
| Output SPL at 31.5 Hz | 119.5 dB |
| Output SPL at 40 Hz | 120.9 dB |
| Output SPL at 50 Hz | 120.6 dB |
| Output SPL at 63 Hz | 120.0 dB |
| Output SPL at 80 Hz | 118.7 dB |
| Output SPL at 100 Hz | 120.1 dB |
| Output SPL at 125 Hz | 120.2 dB |
| Warranty | 5 |
| Weight | 132.9 lbs / 60.3 kg |
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XTZ Sound 99 W12S: $1499
Pros: 12-inch ported with Bang & Olufsen ICEpower half-kilowatt amplification. Sweepable phase knob with flexible EQ1/EQ2 switches for refined tuning. Excellent value high-output performance with powerful, clean amplification.
| CEA-2010-A Average (40-80Hz) | 114.5 dB |
|---|---|
| Country | Sweden |
| Dimensions | 19.65"H x 13.77"W x 15.75"D (499.1 x 349.8 x 400.0 mm) |
| Drivers | 12" (305mm) driver |
| Enclosure | ported, rear |
| Frequency Response | Not fully specified |
| Measurement Source | Ilkka Rissanen |
| Output SPL at 20 Hz | 74.0 dB |
| Output SPL at 25 Hz | 86.5 dB |
| Output SPL at 31.5 Hz | 97.7 dB |
| Output SPL at 40 Hz | 108.3 dB |
| Output SPL at 50 Hz | 114.9 dB |
| Output SPL at 63 Hz | 117.3 dB |
| Output SPL at 80 Hz | 117.4 dB |
| Power Output (Watts) | Not fully specified |
| Weight | 67.2 lbs / 30.5 kg |
- Head-to-Head Comparisons
- Links
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Product prices and availability were last checked August 9, 2026 at 6:57 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.