Short answer: the Rythmik F12 for servo-controlled bass, the Klipsch R-121SW for the much lower price. The F12 ranks #20 of 145 medium subwoofers at $1439, pairing a sealed 12-inch servo driver with 370W RMS for excellent value. The R-121SW costs $249, with a 12-inch spun-copper driver and 200W RMS delivering controlled, musical bass with minimal distortion.
What the Klipsch R-121SW gets right: 12-inch spun-copper driver with 200W RMS delivers controlled, musical bass with minimal distortion.
On the Rythmik F12 side: Sealed 12-inch servo with 370W RMS offers excellent value.
Buy the Klipsch R-121SW if the price is the priority over sound quality, or the Rythmik F12 if sound quality is the priority over the price.
Still deciding? The full Subwoofers rankings cover every ranked option.
Specifications Side By Side
| Klipsch R-121SW | Rythmik F12 | |
|---|---|---|
| Price | $249.00 | $1,120 |
| Ranked | #95 of 145 in Medium Home Subwoofers (30-75 lbs) | #20 of 145 in Medium Home Subwoofers (30-75 lbs) |
| Enclosure | ported, rear | sealed |
| Output SPL at 15 Hz | 90.7 dB | - |
| Output SPL at 20 Hz | 96.0 dB | 103.6 dB |
| Output SPL at 25 Hz | 98.4 dB | 106.7 dB |
| Output SPL at 31.5 Hz | 102.3 dB | 113.5 dB |
| Output SPL at 40 Hz | 108.2 dB | 118.3 dB |
| Output SPL at 50 Hz | 112.4 dB | 119.1 dB |
| Output SPL at 63 Hz | 112.9 dB | 120.4 dB |
| Output SPL at 80 Hz | 111.3 dB | 119.6 dB |
| Output SPL at 100 Hz | 109.9 dB | - |
| Output SPL at 125 Hz | 108.3 dB | - |
| CEA-2010-A Average (40-80Hz) | 111.2 dB | 119.3 dB |
| Dimensions | 16.6"H x 16"W x 19.7"D (421.6 x 406.4 x 500.4 mm) | 15.7"H x 15.7"W x 17"D (400.0 x 400.0 x 431.8 mm) |
| Weight | 35.1 lbs (15.9 kg) | 75 lbs (34.0 kg) |
| Warranty | 5/2 | 5/3 |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Audioholics | Brent Butterworth |
| Amplifier Power | 200W RMS | 370W RMS |
| Frequency Response | 28-120Hz | 14Hz extension |
| Drivers | 12" (305mm) driver | 12" (305mm) driver |
| Output SPL at 16 Hz | - | 101.0 dB |
| 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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Prices on this page were last checked September 23, 2026 at 11:24 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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The Two Speakers In Full
Klipsch R-121SW: $249.00 Amazon eBay
Pros: 12-inch spun-copper driver with 200W RMS delivers controlled, musical bass with minimal distortion. Front-firing design maximizes placement flexibility. Excellent value with exceptional bang-for-buck.
Full Klipsch R-121SW review and specifications →
| Amplifier Power | 200W RMS |
|---|---|
| CEA-2010-A Average (40-80Hz) | 111.2 dB |
| Cabinet Color | black |
| Country | United States |
| Dimensions | 16.6"H x 16"W x 19.7"D (421.6 x 406.4 x 500.4 mm) |
| Drivers | 12" (305mm) driver |
| Enclosure | ported, rear |
| Frequency Response | 28-120Hz |
| Measurement Source | Audioholics |
| Output SPL at 15 Hz | 90.7 dB |
| Output SPL at 20 Hz | 96.0 dB |
| Output SPL at 25 Hz | 98.4 dB |
| Output SPL at 31.5 Hz | 102.3 dB |
| Output SPL at 40 Hz | 108.2 dB |
| Output SPL at 50 Hz | 112.4 dB |
| Output SPL at 63 Hz | 112.9 dB |
| Output SPL at 80 Hz | 111.3 dB |
| Output SPL at 100 Hz | 109.9 dB |
| Output SPL at 125 Hz | 108.3 dB |
| Warranty | 5/2 |
| Weight | 35.1 lbs (15.9 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by Audioholics; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons
- Klipsch R-121SW vs RSL (Rogersound Labs) Speedwoofer 10S MKII
- Klipsch R-121SW vs Monoprice Monolith M-10 V2
- Klipsch R-121SW vs Monoprice SSW-10
- Klipsch R-121SW vs Kef KC62
- Klipsch R-121SW vs SVS PB-1000 PRO
- Klipsch R-121SW vs SVS SB-2000
- Klipsch R-121SW vs JBL HDI-1200P
- Klipsch R-121SW vs Power Sound Audio (PSA) XS15SE
- See all 17 comparisons
Rythmik F12: $1,120 Rythmik Audio eBay
Pros: Sealed 12-inch servo with 370W RMS offers excellent value. Very musical and can disappear in small rooms. Digs to 14Hz with excellent build quality and well-braced cabinet.
Full Rythmik F12 review and specifications →
| AES Input | No |
|---|---|
| Amplifier Power | 370W RMS |
| Aux Input | No |
| CEA-2010-A Average (40-80Hz) | 119.3 dB |
| Cabinet Color | black |
| Coaxial Input | No |
| Country | United States |
| Dimensions | 15.7"H x 15.7"W x 17"D (400.0 x 400.0 x 431.8 mm) |
| Drivers | 12" (305mm) driver |
| Enclosure | sealed |
| Frequency Response | 14Hz extension |
| HDMI Input | No |
| Inputs | XLR (2), RCA (line/LFE) |
| Measurement Source | Brent Butterworth |
| Optical Input | No |
| Output SPL at 16 Hz | 101.0 dB |
| Output SPL at 20 Hz | 103.6 dB |
| Output SPL at 25 Hz | 106.7 dB |
| Output SPL at 31.5 Hz | 113.5 dB |
| Output SPL at 40 Hz | 118.3 dB |
| Output SPL at 50 Hz | 119.1 dB |
| Output SPL at 63 Hz | 120.4 dB |
| Output SPL at 80 Hz | 119.6 dB |
| RCA Input | Yes |
| TRS Input | No |
| USB Input | No |
| Warranty | 5/3 |
| Weight | 75 lbs (34.0 kg) |
| XLR Input | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by Brent Butterworth; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons