The Kef R400 ranks #100 out of 145 total Medium Home Subwoofers (30-75 lbs) for sound quality. See all Subwoofers rankings for every top pick.
Brand: KEF
Prices on this page were last checked September 14, 2026 at 1:47 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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#100 Kef R400: $699 Discontinued eBay
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.
Cons: Discontinued.
How it compares: Just above it: Monoprice 10in Powered Studio Multimedia - $500 cheaper. Just below it: RBH Sound SX-10R - $200 more.
| Amplifier Power | 500W RMS |
|---|---|
| CEA-2010-A Average (40-80Hz) | 110.8 dB (avg of 3/4 bands) |
| Country | United Kingdom |
| Dimensions | 14.4"H x 13"W x 13.8"D (365.8 x 330.2 x 350.5 mm) |
| Discontinued | Yes |
| Drivers | 2x 9" (229mm) driver |
| 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 |
| Warranty | 5/2/5 |
| Weight | 47.4 lbs (21.5 kg) |
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- Independently measured by Brent Butterworth; the published figures above come from this ASR subwoofer measurement thread.