Short answer: the Monoprice Premium Select 8in 200-Watt. It ranks #46 of 73 subwoofers by sound quality (rated 3.2/5) at $224.99 and is still sold new; the Monoprice Monolith 8 THX Certified ranks #66 (rated 2.7/5) and is discontinued, so it is only an option used.
The Monoprice Premium Select 8in 200-Watt is the better-sounding choice. A low cost ported 8 inch subwoofer with a 200 watt amp, an easy entry point for a first subwoofer. The tradeoff: Very compact 18.5 lbs (8.4 kg) size, limited 106.4 dB output, ported room interaction, and entry-level build.
Why pick the Monoprice Monolith 8 THX Certified: A compact THX certified 8 inch subwoofer with selectable modes, sized for a small room or satellite system. The tradeoff: Deep-bass output is modest for a home-theater subwoofer, falling to 72.9dB at 20Hz and 86.1dB at 25Hz.
Buy the Monoprice Premium Select 8in 200-Watt. It is rated higher for sound quality, and the Monoprice Monolith 8 THX Certified is discontinued, so it is only available used.
Looking for alternatives? See the complete Subwoofers rankings.
A low cost ported 8 inch subwoofer with a 200 watt amp, an easy entry point for a first subwoofer.
A compact THX certified 8 inch subwoofer with selectable modes, sized for a small room or satellite system.
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Specifications Side By Side
| Monoprice Premium Select 8in 200-Watt | Monoprice Monolith 8 THX Certified | |
|---|---|---|
| Price | $224.99 | $350 Discontinued |
| Ranked | #46 of 73 in Small Home Subwoofers (Under 30 lbs) | #66 of 73 in Small Home Subwoofers (Under 30 lbs) |
| Enclosure | ported, front | ported |
| Output SPL at 20 Hz | 51.3 dB | 72.9 dB |
| Output SPL at 25 Hz | 69.3 dB | 86.1 dB |
| Output SPL at 31.5 Hz | 91.8 dB | 93.2 dB |
| Output SPL at 40 Hz | 98.3 dB | 96.9 dB |
| Output SPL at 50 Hz | 104.8 dB | 99.3 dB |
| Output SPL at 63 Hz | 110.7 dB | 100.7 dB |
| Output SPL at 80 Hz | 111.8 dB | 101.6 dB |
| CEA-2010-A Average (40-80Hz) | 106.4 dB | 99.6 dB |
| Dimensions | 15”H x 10.6”W x 12.8”D (381.0 x 269.2 x 325.1 mm) | 12.6”H x 13.5”W x 12.6”D (319.8 x 342.9 x 319.8 mm) |
| Weight | 18.5 lbs (8.4 kg) | 19.8 lbs (9.0 kg) |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Brent Butterworth | ErinsAudioCorner |
| Drivers | 8” (203mm) driver | 8” (203mm) driver |
| Warranty | 1 year | - |
| Output SPL at 100 Hz | - | 101.9 dB |
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