Short answer: the Monoprice Premium Select 8in 200-Watt, if you are buying new. The Sony SA-CS9 ranks higher than it (#7 vs #46 of 73 subwoofers, 3.7/5 vs 3.2/5) but is discontinued, so only consider it used; the Monoprice Premium Select 8in 200-Watt is still sold new at $224.99.
The case for the Monoprice Premium Select 8in 200-Watt: A low cost ported 8 inch subwoofer with a 200 watt amp, an easy entry point for a first subwoofer. The catch: Very compact 18.5 lbs (8.4 kg) size, limited 106.4 dB output, ported room interaction, and entry-level build.
The Sony SA-CS9 is the better-sounding option. A discontinued budget ported 10 inch subwoofer that adds upper bass punch to movies and music in a modest room. Watch for: Deep-bass output is more limited than the strong 40-80 Hz result suggests, so it is not the right choice when the lowest movie effects are the priority.
Buy the Monoprice Premium Select 8in 200-Watt, since the Sony SA-CS9 is discontinued and only worth hunting down used.
Still deciding? The full Subwoofers rankings cover every ranked option.
A low cost ported 8 inch subwoofer with a 200 watt amp, an easy entry point for a first subwoofer.
A discontinued budget ported 10 inch subwoofer that adds upper bass punch to movies and music in a modest room.
Prices on this page were last checked October 31, 2026 at 7:11 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
| Monoprice Premium Select 8in 200-Watt | Sony SA-CS9 | |
|---|---|---|
| Price | $224.99 | $200 Discontinued |
| Ranked | #46 of 73 in Small Home Subwoofers (Under 30 lbs) | #7 of 73 in Small Home Subwoofers (Under 30 lbs) |
| Enclosure | ported, front | ported, rear |
| Output SPL at 20 Hz | 51.3 dB | 83.7 dB |
| Output SPL at 25 Hz | 69.3 dB | 95.1 dB |
| Output SPL at 31.5 Hz | 91.8 dB | 98.8 dB |
| Output SPL at 40 Hz | 98.3 dB | 104.3 dB |
| Output SPL at 50 Hz | 104.8 dB | 112.4 dB |
| Output SPL at 63 Hz | 110.7 dB | 117.2 dB |
| Output SPL at 80 Hz | 111.8 dB | 116.9 dB |
| CEA-2010-A Average (40-80Hz) | 106.4 dB | 112.7 dB |
| Dimensions | 15”H x 10.6”W x 12.8”D (381.0 x 269.2 x 325.1 mm) | 13.6”H x 11.6”W x 15.7”D (344.9 x 294.9 x 399.8 mm) |
| Weight | 18.5 lbs (8.4 kg) | 25.4 lbs (11.5 kg) |
| Cabinet Color | black | black |
| Country | United States | Japan |
| Measurement Source | Brent Butterworth | Brent Butterworth |
| Drivers | 8” (203mm) driver | 10” (254mm) driver |
| Warranty | 1 year | 1? |
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