Short answer: the Monoprice Monolith M15-S, if you are buying new. The Reaction Audio PV-15X ranks higher than it (#21 vs #72 of 110 subwoofers, 4.4/5 vs 4.1/5) but is discontinued, so only consider it used; the Monoprice Monolith M15-S is still sold new at $999.
What the Reaction Audio PV-15X gets right: 15-inch ported driver delivers 126.2dB CEA-2010-A average from a purpose-built cinema-style cabinet. The catch: Passive design requires a separate external amplifier and weighs 68 kg (149.9 lbs).
Buy the Monoprice Monolith M15-S, since the Reaction Audio PV-15X is discontinued and only worth hunting down used.
Still deciding? The full Subwoofers rankings cover every ranked option.
Specifications Side By Side
| Monoprice Monolith M15-S | Reaction Audio PV-15X | |
|---|---|---|
| Price | $999 | $1999 Discontinued |
| Ranked | #72 of 110 in Large Home Subwoofers (Over 75 lbs) | #21 of 110 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | sealed | ported, rear |
| Output SPL at 15 Hz | 100.1 dB | 105.3 dB |
| Output SPL at 20 Hz | 105.6 dB | 111.3 dB |
| Output SPL at 25 Hz | 111.2 dB | 116.1 dB |
| Output SPL at 31.5 Hz | 115.2 dB | 119.8 dB |
| Output SPL at 40 Hz | 118.4 dB | 125.3 dB |
| Output SPL at 50 Hz | 119.3 dB | 126.8 dB |
| Output SPL at 63 Hz | 119.6 dB | 126.1 dB |
| Output SPL at 80 Hz | 118.9 dB | 126.5 dB |
| Output SPL at 100 Hz | 119.1 dB | 126.4 dB |
| Output SPL at 125 Hz | 118.9 dB | 126.1 dB |
| CEA-2010-A Average (40-80Hz) | 119.0 dB | 126.2 dB |
| Dimensions | 23.5"H x 16.7"W x 19.7"D (596.9 x 424.2 x 500.4 mm) | 18"H x 22"W x 29"D (457.2 x 558.8 x 736.6 mm) |
| Warranty | 5 | - |
| Country | United States | - |
| Measurement Source | Manufacturer | Data-bass |
| Weight | 80 lbs (36.3 kg) | 149.9 lbs (68 kg) |
| Drivers | 15" (381mm) driver | 15" (381mm) driver |
| Discontinued | - | Yes |
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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 M15-S: $999 eBay
Pros: Published CEA-2010 specifications list 105.6 dB at 20 Hz and 119.0 dB through 40-80 Hz. The sealed enclosure with 15” (381mm) driver has the headroom for demanding film bass in a large room.
Cons: The 596.9H x 424.2W x 500.4D mm cabinet and 36.3 kg mass make this a serious placement and moving commitment. A sealed cabinet still needs careful placement and calibration to avoid room-mode peaks.
Notes: Product # 35141
Full Monoprice Monolith M15-S review and specifications →
| CEA-2010-A Average (40-80Hz) | 119.0 dB |
|---|---|
| Country | United States |
| Dimensions | 23.5"H x 16.7"W x 19.7"D (596.9 x 424.2 x 500.4 mm) |
| Drivers | 15" (381mm) driver |
| Enclosure | sealed |
| Measurement Source | Manufacturer |
| Output SPL at 15 Hz | 100.1 dB |
| Output SPL at 20 Hz | 105.6 dB |
| Output SPL at 25 Hz | 111.2 dB |
| Output SPL at 31.5 Hz | 115.2 dB |
| Output SPL at 40 Hz | 118.4 dB |
| Output SPL at 50 Hz | 119.3 dB |
| Output SPL at 63 Hz | 119.6 dB |
| Output SPL at 80 Hz | 118.9 dB |
| Output SPL at 100 Hz | 119.1 dB |
| Output SPL at 125 Hz | 118.9 dB |
| Warranty | 5 |
| Weight | 80 lbs (36.3 kg) |
- Reviews, Comparisons and Sound Samples
- These figures are manufacturer-specified rather than independently measured.
- Head-to-Head Comparisons
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- Monoprice Monolith M15-S vs HSU Research VTF-15H MK2
- Monoprice Monolith M15-S vs Rythmik FV15HP
- Monoprice Monolith M15-S vs Monoprice Monolith M-215
- Monoprice Monolith M15-S vs Monoprice Monolith 16 THX Ultra
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Reaction Audio PV-15X: $1999 Discontinued eBay
Pros: 15-inch ported driver delivers 126.2dB CEA-2010-A average from a purpose-built cinema-style cabinet.
Cons: Passive design requires a separate external amplifier and weighs 68 kg. Discontinued.
Full Reaction Audio PV-15X review and specifications →
| CEA-2010-A Average (40-80Hz) | 126.2 dB |
|---|---|
| Dimensions | 18"H x 22"W x 29"D (457.2 x 558.8 x 736.6 mm) |
| Discontinued | Yes |
| Drivers | 15" (381mm) driver |
| Enclosure | ported, rear |
| Measurement Source | Data-bass |
| Output SPL at 15 Hz | 105.3 dB |
| Output SPL at 20 Hz | 111.3 dB |
| Output SPL at 25 Hz | 116.1 dB |
| Output SPL at 31.5 Hz | 119.8 dB |
| Output SPL at 40 Hz | 125.3 dB |
| Output SPL at 50 Hz | 126.8 dB |
| Output SPL at 63 Hz | 126.1 dB |
| Output SPL at 80 Hz | 126.5 dB |
| Output SPL at 100 Hz | 126.4 dB |
| Output SPL at 125 Hz | 126.1 dB |
| Weight | 149.9 lbs (68 kg) |
- Reviews, Comparisons and Sound Samples
- Independently measured by Data-bass; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons
- Reaction Audio PV-15X vs JTR Speakers Captivator 2400
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- Reaction Audio PV-15X vs Monoprice Monolith M-215
- Reaction Audio PV-15X vs Monoprice Monolith 16 THX Ultra
- Reaction Audio PV-15X vs JBL 4645C
- Reaction Audio PV-15X vs Danley Sound Labs DTS10
- Reaction Audio PV-15X vs JTR Speakers Growler (2015)
- Reaction Audio PV-15X vs Chase Home Theater SS18.1
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