Short answer: the Monoprice Premium Select 8in 200-Watt. It ranks #33 of 48 subwoofers by sound quality at $224.99; the Monoprice Monolith 8 THX Certified ranks #43 and costs $350, so there is little reason to consider the other one.
What the Monoprice Premium Select 8in 200-Watt offers: 8-inch ported driver still manages 106.4dB CEA-2010-A average at the lowest price of any subwoofer tested in this weight class. An easy entry point for a first subwoofer. Watch for: Very compact 8.4 kg size, limited 106.4 dB output, ported room interaction, and entry-level build.
What the Monoprice Monolith 8 THX Certified offers: A compact 9kg, ported 8-inch subwoofer with THX certification that can suit a small room or satellite-based system without taking much floor space. Measured output is useful through the upper bass: 99.3dB at 50Hz, 100.7dB at 63Hz and 101.6dB at 80Hz. Its selectable THX/EQ modes provide a more controlled option for music than the extended setting. Watch for: Deep-bass output is modest for a home-theater subwoofer, falling to 72.9dB at 20Hz and 86.1dB at 25Hz. It will not deliver the infrasonic impact or room-filling output of a larger model, and the manufacturer lists it as out of stock. Choose it for compactness and moderate listening levels, not for demanding cinema effects.
Buy the Monoprice Premium Select 8in 200-Watt. It ranks higher for sound quality than the Monoprice Monolith 8 THX Certified and costs less, which settles it without a real tradeoff to make.
If sound quality matters at all to you, skip the Monoprice Monolith 8 THX Certified. It ranks near the bottom of the 48 subwoofers, so look higher up the list instead.
Looking for alternatives? See the complete Subwoofers rankings.
Specifications Side By Side
| Monoprice Premium Select 8in 200-Watt | Monoprice Monolith 8 THX Certified | |
|---|---|---|
| Price | $224.99 | $350 |
| Ranked | #33 of 48 in Small Home Subwoofers (Under 30 lbs) | #43 of 48 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 |
| Output SPL at 100 Hz | - | 101.9 dB |
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Prices on this page were last checked September 16, 2026 at 12:41 AM 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 Premium Select 8in 200-Watt: $224.99 Amazon eBay
Pros: 8-inch ported driver still manages 106.4dB CEA-2010-A average at the lowest price of any subwoofer tested in this weight class. An easy entry point for a first subwoofer.
Cons: Very compact 8.4 kg size, limited 106.4 dB output, ported room interaction, and entry-level build.
Notes: Product # 14567
Full Monoprice Premium Select 8in 200-Watt review and specifications →
| CEA-2010-A Average (40-80Hz) | 106.4 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 15"H x 10.6"W x 12.8"D (381.0 x 269.2 x 325.1 mm) |
| Drivers | 8" (203mm) driver |
| Enclosure | ported, front |
| Measurement Source | Brent Butterworth |
| Output SPL at 20 Hz | 51.3 dB |
| Output SPL at 25 Hz | 69.3 dB |
| Output SPL at 31.5 Hz | 91.8 dB |
| Output SPL at 40 Hz | 98.3 dB |
| Output SPL at 50 Hz | 104.8 dB |
| Output SPL at 63 Hz | 110.7 dB |
| Output SPL at 80 Hz | 111.8 dB |
| Weight | 18.5 lbs (8.4 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by Brent Butterworth; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons
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- Monoprice Premium Select 8in 200-Watt vs JL Audio Dominion d108
- Monoprice Premium Select 8in 200-Watt vs Q Acoustics 3060S
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- See all 34 comparisons
Monoprice Monolith 8 THX Certified: $350 eBay
Pros: A compact 9kg, ported 8-inch subwoofer with THX certification that can suit a small room or satellite-based system without taking much floor space. Measured output is useful through the upper bass: 99.3dB at 50Hz, 100.7dB at 63Hz and 101.6dB at 80Hz. Its selectable THX/EQ modes provide a more controlled option for music than the extended setting.
Cons: Deep-bass output is modest for a home-theater subwoofer, falling to 72.9dB at 20Hz and 86.1dB at 25Hz. It will not deliver the infrasonic impact or room-filling output of a larger model, and the manufacturer lists it as out of stock. Choose it for compactness and moderate listening levels, not for demanding cinema effects.
Notes: Product # 41289
Full Monoprice Monolith 8 THX Certified review and specifications →
| CEA-2010-A Average (40-80Hz) | 99.6 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 12.6"H x 13.5"W x 12.6"D (319.8 x 342.9 x 319.8 mm) |
| Drivers | 8" (203mm) driver |
| Enclosure | ported |
| Measurement Source | ErinsAudioCorner |
| Output SPL at 20 Hz | 72.9 dB |
| Output SPL at 25 Hz | 86.1 dB |
| Output SPL at 31.5 Hz | 93.2 dB |
| Output SPL at 40 Hz | 96.9 dB |
| Output SPL at 50 Hz | 99.3 dB |
| Output SPL at 63 Hz | 100.7 dB |
| Output SPL at 80 Hz | 101.6 dB |
| Output SPL at 100 Hz | 101.9 dB |
| Weight | 19.8 lbs (9.0 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by ErinsAudioCorner; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons