Short answer: pick the Rythmik FV18 if you want sound quality that has been measured and ranked; the SVS SB17-Ultra R-Evolution is unmeasured so far, so its case rests on features and price.
What the SVS SB17-Ultra R-Evolution offers: Sealed 17-inch high-excursion driver with dual 8-inch voice coils, driven by a 2,800W RMS dual-monoblock amplifier.
What the Rythmik FV18 brings: Independent CEA-2010 testing records 114.3 dB at 20 Hz and 121.3 dB through 40-80 Hz.
Price: the SVS SB17-Ultra R-Evolution lists at $2,699.99 and the Rythmik FV18 at $2,670.
Buy the Rythmik FV18 if you want a speaker whose sound quality has been measured and ranked.
Buy the SVS SB17-Ultra R-Evolution if you prefer its design or features, and you can wait for measurements to confirm how it sounds.
Looking for alternatives? See the complete Subwoofers rankings.
Specifications Side By Side
| SVS SB17-Ultra R-Evolution | Rythmik FV18 | |
|---|---|---|
| Price | $2,699.99 | $2,670 |
| Ranked | - | #53 of 109 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | sealed | ported, front |
| Drivers | 17” driver, dual 8” voice coils | 18” (457mm) driver |
| Amplifier Power | 2800W RMS | - |
| Frequency Response | 15Hz extension (manufacturer specified) | - |
| Cabinet Color | Piano Gloss Black, Black Oak Veneer | black |
| Country | United States | United States |
| Output SPL at 12.5 Hz | - | 102.0 dB |
| Output SPL at 15 Hz | - | 109.5 dB |
| Output SPL at 20 Hz | - | 114.3 dB |
| Output SPL at 25 Hz | - | 117.6 dB |
| Output SPL at 31.5 Hz | - | 119.2 dB |
| Output SPL at 40 Hz | - | 120.4 dB |
| Output SPL at 50 Hz | - | 121.3 dB |
| Output SPL at 63 Hz | - | 121.7 dB |
| Output SPL at 80 Hz | - | 121.9 dB |
| Output SPL at 100 Hz | - | 122.4 dB |
| Output SPL at 125 Hz | - | 121.9 dB |
| CEA-2010-A Average (40-80Hz) | - | 121.3 dB |
| Dimensions | - | 33”H x 21”W x 22”D (838.2 x 533.4 x 558.8 mm) |
| Weight | - | 160.1 lbs (72.6 kg) |
| Warranty | - | 5/3 |
| Measurement Source | - | Data-bass |
| 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 |
Prices on this page were last checked September 29, 2026 at 3:43 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
SVS SB17-Ultra R-Evolution: $2,699.99 SVS eBay
Older models: the SVS SB16-Ultra (rated 4.1/5) and the SVS SB13-Ultra (rated 4.1/5).
Pros: Sealed 17-inch high-excursion driver with dual 8-inch voice coils, driven by a 2,800W RMS dual-monoblock amplifier. SVS rates extension to 15Hz. The SVS Subwoofer app adds DSP control and Auto EQ room calibration. It replaces the SB16-Ultra, whose ported sibling the PB17-Ultra R-Evolution has been measured and ranked.
Cons: No independent measurements yet, so its output can’t be compared with ranked subwoofers. A sealed flagship at this price gives up deep output against ported designs of the same size, so a large room may still call for two.
Full SVS SB17-Ultra R-Evolution review and specifications →
| Amplifier Power | 2800W RMS |
|---|---|
| Cabinet Color | Piano Gloss Black, Black Oak Veneer |
| Country | United States |
| Drivers | 17” driver, dual 8” voice coils |
| Enclosure | sealed |
| Frequency Response | 15Hz extension (manufacturer specified) |
- Links
- Reviews, Comparisons and Sound Samples
- These figures are manufacturer-specified rather than independently measured.
- Head-to-Head Comparisons
Rythmik FV18: $2,670 Rythmik Audio eBay
Pros: Independent CEA-2010 testing records 114.3 dB at 20 Hz and 121.3 dB through 40-80 Hz. The ported, front enclosure with 18” (457mm) driver has the headroom for demanding film bass in a large room.
Cons: The 838.2H x 533.4W x 558.8D mm cabinet and 72.6 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.
Full Rythmik FV18 review and specifications →
| AES Input | No |
|---|---|
| Aux Input | No |
| CEA-2010-A Average (40-80Hz) | 121.3 dB |
| Cabinet Color | black |
| Coaxial Input | No |
| Country | United States |
| Dimensions | 33”H x 21”W x 22”D (838.2 x 533.4 x 558.8 mm) |
| Drivers | 18” (457mm) driver |
| Enclosure | ported, front |
| HDMI Input | No |
| Inputs | XLR (2), RCA (line/LFE) |
| Measurement Source | Data-bass |
| Optical Input | No |
| Output SPL at 12.5 Hz | 102.0 dB |
| Output SPL at 15 Hz | 109.5 dB |
| Output SPL at 20 Hz | 114.3 dB |
| Output SPL at 25 Hz | 117.6 dB |
| Output SPL at 31.5 Hz | 119.2 dB |
| Output SPL at 40 Hz | 120.4 dB |
| Output SPL at 50 Hz | 121.3 dB |
| Output SPL at 63 Hz | 121.7 dB |
| Output SPL at 80 Hz | 121.9 dB |
| Output SPL at 100 Hz | 122.4 dB |
| Output SPL at 125 Hz | 121.9 dB |
| RCA Input | Yes |
| TRS Input | No |
| USB Input | No |
| Warranty | 5/3 |
| Weight | 160.1 lbs (72.6 kg) |
| XLR Input | Yes |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by Data-bass; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons