The Kef R400 ranks #82 out of 137 total Medium Powered Home Subwoofers (30–75 lbs) for sound quality. See Top Recommended Speakers By Attribute for all the top speaker suggestions.
#82 Kef R400: $699
Pros: Dual 9-inch force-canceling sealed drivers with 500W deliver clean tight powerful bass. Superior build quality with elegant compact design. Excellent integration with KEF R-series speakers.
How it compares: Just above it: Monoprice 10in Powered Studio Multimedia - $500 cheaper. Just below it: RBH Sound SX-10R - $200 more.
| CEA-2010-A Average (40-80Hz) | 110.8 dB (avg of 3/4 bands) |
|---|---|
| Country | United Kingdom |
| Dimensions | 14.4"H x 13.0"W x 13.8"D (365.8 x 330.2 x 350.5 mm) |
| Driver | 10" (254mm) driver |
| Driver(s) | (2) 9 inch |
| Enclosure | sealed |
| Frequency Response | 26-140Hz |
| Measurement Source | Brent Butterworth |
| Output SPL at 20 Hz | 85.8 dB |
| Output SPL at 25 Hz | 87.3 dB |
| Output SPL at 31.5 Hz | 92.7 dB |
| Output SPL at 40 Hz | 107.4 dB |
| Output SPL at 50 Hz | 111.5 dB |
| Output SPL at 63 Hz | 113.6 dB |
| Power Output (Watts) | 500W RMS |
| Warranty | 5/2/5 |
| Weight | 47.4 lbs / 21.5 kg |
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Product prices and availability were last checked July 31, 2026 at 5:30 AM UTC 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.