Short answer: the XTZ Sound 99 W12S, if you are buying new. The Monoprice Monolith M-15 V2 ranks higher than it (#64 vs #47 of 145 subwoofers, 4.2/5 vs 3.8/5) but is discontinued, so only consider it used; the XTZ Sound 99 W12S is still sold new at $1499.
The case for the XTZ Sound 99 W12S: 12-inch ported with Bang & Olufsen ICEpower half-kilowatt amplification.
Buy the XTZ Sound 99 W12S new; the Monoprice Monolith M-15 V2 is no longer sold new, so it only makes sense as a used find.
Still deciding? The full Subwoofers rankings cover every ranked option.
Specifications Side By Side
| Monoprice Monolith M-15 V2 | XTZ Sound 99 W12S | |
|---|---|---|
| Price | $1,500 Discontinued | $1499 |
| Ranked | #64 of 110 in Large Home Subwoofers (Over 75 lbs) | #47 of 145 in Medium 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) | 19.6"H x 13.8"W x 15.7"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 |
| Discontinued | Yes | - |
| Inputs | XLR, RCA | - |
| XLR Input | Yes | - |
| RCA Input | Yes | - |
| TRS Input | No | - |
| Optical Input | No | - |
| Coaxial Input | No | - |
| USB Input | No | - |
| HDMI Input | No | - |
| AES Input | No | - |
| Aux Input | No | - |
| Frequency Response | - | Not fully specified |
| Amplifier Power | - | Not fully specified |
Related Speaker Comparisons
More top alternatives to XTZ Sound 99 W12S:
- MartinLogan Dynamo 1600X vs XTZ Sound 99 W12S
- Monoprice SW-15 vs XTZ Sound 99 W12S
- SVS SB-3000 vs XTZ Sound 99 W12S
- Monoprice Monolith M-15 V2 vs Power Sound Audio (PSA) XS15SE
- HSU Research VTF-15H MK2 vs Monoprice Monolith M-15 V2
Prices on this page were last checked September 23, 2026 at 11:24 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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The Two Speakers In Full
Monoprice Monolith M-15 V2: $1,500 Discontinued eBay
Pros: Published CEA-2010 specifications list 112.6 dB at 20 Hz and 120.0 dB through 40-80 Hz. Its front-ported 15-inch design has substantial deep-bass and midbass headroom for cinema playback.
Cons: Discontinued and no longer sold new. At 60.3 kg and 729.0H x 449.6W x 680.7D mm, it needs committed floor space and careful room integration. Discontinued.
Notes: Product # 42851
Full Monoprice Monolith M-15 V2 review and specifications →
| AES Input | No |
|---|---|
| Aux Input | No |
| CEA-2010-A Average (40-80Hz) | 120.0 dB |
| Cabinet Color | black |
| Coaxial Input | No |
| Country | United States |
| Dimensions | 28.7"H x 17.7"W x 26.8"D (729.0 x 449.6 x 680.7 mm) |
| Discontinued | Yes |
| Drivers | 15" (381mm) driver |
| Enclosure | ported, front |
| HDMI Input | No |
| Inputs | XLR, RCA |
| Measurement Source | Manufacturer |
| Optical Input | No |
| 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 |
| RCA Input | Yes |
| TRS Input | No |
| USB Input | No |
| Warranty | 5 |
| Weight | 132.9 lbs (60.3 kg) |
| XLR Input | Yes |
- Reviews, Comparisons and Sound Samples
- These figures are manufacturer-specified rather than independently measured.
- Head-to-Head Comparisons
- Monoprice Monolith M-15 V2 vs SVS PB-4000
- Monoprice Monolith M-15 V2 vs Arendal 1723 Subwoofer 2S
- Monoprice Monolith M-15 V2 vs Rythmik F18
- Monoprice Monolith M-15 V2 vs Monoprice Monolith M15-S
- Monoprice Monolith M-15 V2 vs HSU Research VTF-3 MK5 HP
- Monoprice Monolith M-15 V2 vs HSU Research VTF-15H MK2
- Monoprice Monolith M-15 V2 vs Rythmik FV15HP
- Monoprice Monolith M-15 V2 vs Monoprice Monolith M-215
- See all 16 comparisons
XTZ Sound 99 W12S: $1499 eBay
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.
Full XTZ Sound 99 W12S review and specifications →
| Amplifier Power | Not fully specified |
|---|---|
| CEA-2010-A Average (40-80Hz) | 114.5 dB |
| Country | Sweden |
| Dimensions | 19.6"H x 13.8"W x 15.7"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 |
| Weight | 67.2 lbs (30.5 kg) |
- Reviews, Comparisons and Sound Samples
- Independently measured by Ilkka Rissanen; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons