Short answer: the Monoprice Monolith M-215 for the higher ranking, the Monoprice Monolith M15-S for the lower price. The Monoprice Monolith M-215 ranks #18 of 97 subwoofers at $2500. The Monoprice Monolith M15-S ranks #62 at $999, $1501 cheaper.
Buy the Monoprice Monolith M-215 if the ranking matters more than the price. Buy the Monoprice Monolith M15-S if the price matters more than the ranking.
Specifications Side By Side
| Monoprice Monolith M-215 | Monoprice Monolith M15-S | |
|---|---|---|
| Price | $2,500 | $999 |
| Ranked | #18 of 97 in Large Powered Home Subwoofers (Over 75 lbs) | #62 of 97 in Large Powered Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | sealed |
| Output SPL at 12.5 Hz | 103.9 dB | - |
| Output SPL at 15 Hz | 113.1 dB | 100.1 dB |
| Output SPL at 20 Hz | 118.9 dB | 105.6 dB |
| Output SPL at 25 Hz | 122.6 dB | 111.2 dB |
| Output SPL at 31.5 Hz | 125.2 dB | 115.2 dB |
| Output SPL at 40 Hz | 126.4 dB | 118.4 dB |
| Output SPL at 50 Hz | 126.1 dB | 119.3 dB |
| Output SPL at 63 Hz | 125.6 dB | 119.6 dB |
| Output SPL at 80 Hz | 125.6 dB | 118.9 dB |
| Output SPL at 100 Hz | 125.7 dB | 119.1 dB |
| Output SPL at 125 Hz | 126.3 dB | 118.9 dB |
| CEA-2010-A Average (40-80Hz) | 125.9 dB | 119.0 dB |
| Dimensions | 42.3"H x 20.0"W x 27.6"D (1074.4 x 508.0 x 701.0 mm) | 23.5"H x 16.7"W x 19.7"D (596.9 x 424.2 x 500.4 mm) |
| Weight | 216.1 lbs / 98.0 kg | 80 lbs / 36.3 kg |
| Warranty | 5 | 5 |
| Cabinet Color | black | - |
| Country | United States | United States |
| Measurement Source | Brent Butterworth | Manufacturer |
| Drivers | 2x 15" (381mm) drivers | 15" (381mm) driver |
The Two Speakers In Full
Monoprice Monolith M-215: $2,500
Notes: Product # 38543
| CEA-2010-A Average (40-80Hz) | 125.9 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 42.3"H x 20.0"W x 27.6"D (1074.4 x 508.0 x 701.0 mm) |
| Drivers | 2x 15" (381mm) drivers |
| Enclosure | ported, front |
| Measurement Source | Brent Butterworth |
| Output SPL at 12.5 Hz | 103.9 dB |
| Output SPL at 15 Hz | 113.1 dB |
| Output SPL at 20 Hz | 118.9 dB |
| Output SPL at 25 Hz | 122.6 dB |
| Output SPL at 31.5 Hz | 125.2 dB |
| Output SPL at 40 Hz | 126.4 dB |
| Output SPL at 50 Hz | 126.1 dB |
| Output SPL at 63 Hz | 125.6 dB |
| Output SPL at 80 Hz | 125.6 dB |
| Output SPL at 100 Hz | 125.7 dB |
| Output SPL at 125 Hz | 126.3 dB |
| Warranty | 5 |
| Weight | 216.1 lbs / 98.0 kg |
- Head-to-Head Comparisons
- Monoprice Monolith M-215 vs Reaction Audio PV-15X
- Monoprice Monolith M-215 vs Monoprice Monolith 16 THX Ultra
- Monoprice Monolith M-215 vs JTR Speakers Captivator S2
- Monoprice Monolith M-215 vs JTR Speakers Captivator 4000ULF
- Monoprice Monolith M-215 vs Power Sound Audio (PSA) TRIAX
- Monoprice Monolith M-215 vs JTR Speakers Orbit Shifter LFU
- Monoprice Monolith M-215 vs JTR Speakers Orbit Shifter PRO
- Monoprice Monolith M-215 vs Rythmik FV15HP
- See all 14 comparisons
- Links
Monoprice Monolith M15-S: $999
Notes: Product # 35141
| 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 |
- Head-to-Head Comparisons
- Monoprice Monolith M15-S vs Rythmik F18
- Monoprice Monolith M15-S vs Monoprice Monolith M-15 V2
- Monoprice Monolith M15-S vs SVS PB-4000
- Monoprice Monolith M15-S vs HSU Research VTF-3 MK5 HP
- Monoprice Monolith M15-S vs HSU Research VTF-15H MK2
- Monoprice Monolith M15-S vs Rythmik FV15HP
- Monoprice Monolith M15-S vs Reaction Audio PV-15X
- Monoprice Monolith M15-S vs Monoprice Monolith 16 THX Ultra
- See all 15 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.