Short answer: the Rythmik F18 on measured sound quality, the RSL (Rogersound Labs) Speedwoofer 12S on price. The Rythmik F18 ranks #85 of 143 subwoofers, rated 4.1/5, at $2,344. The RSL (Rogersound Labs) Speedwoofer 12S ranks #131, rated 3.7/5, at $884.96, $1,459.04 cheaper.
The Rythmik F18 is the better-sounding option. A massive sealed 18 inch subwoofer with tight, powerful bass and balanced XLR inputs, built for big home theaters. Watch for: The 520.7H x 520.7W x 533.4D mm cabinet and 115.1 lbs (52.2 kg) mass make this a serious placement and moving commitment.
Why pick the RSL (Rogersound Labs) Speedwoofer 12S: An affordable rear ported 12 inch subwoofer with strong deep bass output for movies. The tradeoff: The 565.1H x 479.4W x 562.0D mm cabinet and 82 lbs (37.2 kg) mass make this a serious placement and moving commitment.
Buy the Rythmik F18 if sound quality is the priority over the price, or the RSL (Rogersound Labs) Speedwoofer 12S if the price is the priority over sound quality.
Still deciding? The full Subwoofers rankings cover every ranked option.
A massive sealed 18 inch subwoofer with tight, powerful bass and balanced XLR inputs, built for big home theaters.
An affordable rear ported 12 inch subwoofer with strong deep bass output for movies.
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
| Rythmik F18 | RSL (Rogersound Labs) Speedwoofer 12S | |
|---|---|---|
| Price | $2,344 | $884.96 |
| Ranked | #85 of 143 in Large Home Subwoofers (Over 75 lbs) | #131 of 143 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | sealed | ported, rear |
| Output SPL at 10 Hz | 93.7 dB | - |
| Output SPL at 12.5 Hz | 97.4 dB | - |
| Output SPL at 15 Hz | 102.0 dB | 104.4 dB |
| Output SPL at 20 Hz | 106.2 dB | 109.3 dB |
| Output SPL at 25 Hz | 110.9 dB | 110.9 dB |
| Output SPL at 31.5 Hz | 114.3 dB | 112.5 dB |
| Output SPL at 40 Hz | 117.1 dB | 113.4 dB |
| Output SPL at 50 Hz | 119.1 dB | 113.4 dB |
| Output SPL at 63 Hz | 120.5 dB | 113.0 dB |
| Output SPL at 80 Hz | 121.2 dB | 113.1 dB |
| Output SPL at 100 Hz | 121.4 dB | 112.2 dB |
| Output SPL at 125 Hz | 121.4 dB | - |
| CEA-2010-A Average (40-80Hz) | 119.5 dB | 113.2 dB |
| Dimensions | 20.5”H x 20.5”W x 21”D (520.7 x 520.7 x 533.4 mm) | 22.2”H x 18.9”W x 22.1”D (565.1 x 479.4 x 562.0 mm) |
| Weight | 115.1 lbs (52.2 kg) | 82 lbs (37.2 kg) |
| Warranty | 5/3 | 5/3 |
| Cabinet Color | black | black, white |
| Country | United States | United States |
| Measurement Source | Data-bass | ErinsAudioCorner |
| Drivers | 18” (457mm) driver | 12” (305mm) driver |
| Inputs | XLR (2), RCA (line/LFE) | - |
| 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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