Short answer: the JTR Speakers Orbit Shifter PRO. It ranks #1 of 143 subwoofers by sound quality (rated 4.8/5) at $4,499 and is still sold new; the Monoprice Monolith M15-S ranks #88 (rated 4.1/5) and is discontinued, so it is only an option used.
Buy the JTR Speakers Orbit Shifter PRO. It is rated higher for sound quality; the Monoprice Monolith M15-S is no longer sold new.
Looking for alternatives? See the complete Subwoofers rankings.
Prices on this page were last checked November 7, 2026 at 7:34 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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Specifications Side By Side
| JTR Speakers Orbit Shifter PRO | Monoprice Monolith M15-S | |
|---|---|---|
| Price | $4,499 each | $999 Discontinued |
| Ranked | #1 of 143 in Large Home Subwoofers (Over 75 lbs) | #88 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | horn | sealed |
| Output SPL at 15 Hz | 95.7 dB | 100.1 dB |
| Output SPL at 20 Hz | 101.9 dB | 105.6 dB |
| Output SPL at 25 Hz | 114.9 dB | 111.2 dB |
| Output SPL at 31.5 Hz | 128.2 dB | 115.2 dB |
| Output SPL at 40 Hz | 136.0 dB | 118.4 dB |
| Output SPL at 50 Hz | 141.0 dB | 119.3 dB |
| Output SPL at 63 Hz | 144.0 dB | 119.6 dB |
| Output SPL at 80 Hz | 144.2 dB | 118.9 dB |
| Output SPL at 100 Hz | 143.4 dB | 119.1 dB |
| Output SPL at 125 Hz | 140.1 dB | 118.9 dB |
| CEA-2010-A Average (40-80Hz) | 141.3 dB | 119.0 dB |
| Dimensions | 45”H x 22.5”W x 32”D (1143.0 x 571.5 x 812.8 mm) | 23.5”H x 16.7”W x 19.7”D (596.9 x 424.2 x 500.4 mm) |
| Weight | 185 lbs (83.9 kg) | 80 lbs (36.3 kg) |
| Warranty | 5 | 5 |
| Cabinet Color | black | - |
| Country | United States | United States |
| Measurement Source | Data-bass | Manufacturer |
| Drivers | 18” (457mm) driver | 15” (381mm) driver |
| 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 | - |
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