Short answer: the RSL Speedwoofer 10S MKII for amplifier headroom, the Klipsch R-121SW for price. The RSL ranks #124 of 212 medium subwoofers at $499, pairing a 10-inch ported cabinet with a 400W RMS (1020W peak) XDR amplifier. The R-121SW costs $389.99, and its 12-inch spun-copper driver with 200W RMS delivers controlled, musical bass with minimal distortion.
Buy the Klipsch R-121SW. Both are rated the same for sound quality, and it costs $109.01 less than the RSL (Rogersound Labs) Speedwoofer 10S MKII.
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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
| Klipsch R-121SW | RSL (Rogersound Labs) Speedwoofer 10S MKII | |
|---|---|---|
| Price | $389.99 | $499 |
| Ranked | #132 of 212 in Medium Home Subwoofers (30-75 lbs) | #124 of 212 in Medium Home Subwoofers (30-75 lbs) |
| Enclosure | ported, rear | ported, rear |
| Output SPL at 15 Hz | 90.7 dB | 89.0 dB |
| Output SPL at 20 Hz | 96.0 dB | 100.0 dB |
| Output SPL at 25 Hz | 98.4 dB | 105.0 dB |
| Output SPL at 31.5 Hz | 102.3 dB | 107.7 dB |
| Output SPL at 40 Hz | 108.2 dB | 110.3 dB |
| Output SPL at 50 Hz | 112.4 dB | 112.9 dB |
| Output SPL at 63 Hz | 112.9 dB | 113.0 dB |
| Output SPL at 80 Hz | 111.3 dB | 112.1 dB |
| Output SPL at 100 Hz | 109.9 dB | 111.4 dB |
| Output SPL at 125 Hz | 108.3 dB | 110.7 dB |
| CEA-2010-A Average (40-80Hz) | 111.2 dB | 112.1 dB |
| Dimensions | 16.6”H x 16”W x 19.7”D (421.6 x 406.4 x 500.4 mm) | 15.5”H x 15”W x 15.7”D (393.7 x 381.0 x 400.0 mm) |
| Weight | 35.1 lbs (15.9 kg) | 40.6 lbs (18.4 kg) |
| Warranty | 5/2 | 5/2 |
| Cabinet Color | black | black, white |
| Country | United States | United States |
| Measurement Source | Audioholics | Audioholics |
| Amplifier Power | 200W RMS | 400W RMS |
| Frequency Response | 28-120Hz | 21-200Hz |
| Drivers | 12” (305mm) driver | 10” (254mm) driver |
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