Short answer: the HSU Research VTF-3 MK5 HP. It ranks #59 of 143 subwoofers by sound quality (rated 4.2/5) at $1,049 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 HSU Research VTF-3 MK5 HP. It is rated higher for sound quality; the Monoprice Monolith M15-S is no longer sold new.
Still deciding? The full Subwoofers rankings cover every ranked option.
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
| HSU Research VTF-3 MK5 HP | Monoprice Monolith M15-S | |
|---|---|---|
| Price | $1,049.00 | $999 Discontinued |
| Ranked | #59 of 143 in Large Home Subwoofers (Over 75 lbs) | #88 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | sealed |
| Output SPL at 15 Hz | 100.8 dB | 100.1 dB |
| Output SPL at 20 Hz | 108.2 dB | 105.6 dB |
| Output SPL at 25 Hz | 113.4 dB | 111.2 dB |
| Output SPL at 31.5 Hz | 118.2 dB | 115.2 dB |
| Output SPL at 40 Hz | 121.9 dB | 118.4 dB |
| Output SPL at 50 Hz | 122.3 dB | 119.3 dB |
| Output SPL at 63 Hz | 121.1 dB | 119.6 dB |
| Output SPL at 80 Hz | 120.4 dB | 118.9 dB |
| CEA-2010-A Average (40-80Hz) | 121.4 dB | 119.0 dB |
| Dimensions | 25”H x 17.2”W x 24”D (635.0 x 438.1 x 609.6 mm) | 23.5”H x 16.7”W x 19.7”D (596.9 x 424.2 x 500.4 mm) |
| Weight | 85.1 lbs (38.6 kg) | 80 lbs (36.3 kg) |
| Warranty | 7/2(+3) | 5 |
| Cabinet Color | black | - |
| Country | United States | United States |
| Measurement Source | Manufacturer | Manufacturer |
| Drivers | 15” (381mm) driver | 15” (381mm) driver |
| Output SPL at 100 Hz | - | 119.1 dB |
| Output SPL at 125 Hz | - | 118.9 dB |
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