Short answer: the Rythmik LV12 is the proven choice, measured and ranked among subwoofers, while the newer KRK S12.4 has no independent measurements yet and can only be compared on specs.
The case for the KRK S12.4: A 12-inch Kevlar woofer in a reinforced MDF cabinet with a front-firing port, driven by a 220W Class-D amplifier.
On the Rythmik LV12 side: 12-inch ported with 300W RMS, direct servo control extends 19Hz.
On paper: The Rythmik LV12 has more amplifier power, 300W against 220W.
Price: the KRK S12.4 lists at $839 and the Rythmik LV12 at $899.
Buy the Rythmik LV12 if you want a speaker whose sound quality has been measured and ranked. It also has more power.
Buy the KRK S12.4 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
| KRK S12.4 | Rythmik LV12 | |
|---|---|---|
| Price | $839.00 | $899 |
| Ranked | - | #7 of 145 in Medium Home Subwoofers (30-75 lbs) |
| Enclosure | ported, front | ported, front |
| Drivers | 12” Kevlar driver | 12” (305mm) driver |
| Amplifier Power | 220W | 300W RMS |
| Country | United States | United States |
| Output SPL at 20 Hz | - | 107.7 dB |
| Output SPL at 25 Hz | - | 113.2 dB |
| Output SPL at 31.5 Hz | - | 116.6 dB |
| Output SPL at 40 Hz | - | 120.2 dB |
| Output SPL at 50 Hz | - | 120.4 dB |
| Output SPL at 63 Hz | - | 121.2 dB |
| Output SPL at 80 Hz | - | 119.3 dB |
| CEA-2010-A Average (40-80Hz) | - | 120.3 dB |
| Dimensions | - | 19.5”H x 15”W x 18.5”D (495.3 x 381.0 x 469.9 mm) |
| Weight | - | 69 lbs (31.3 kg) |
| Warranty | - | 5/3 |
| Cabinet Color | - | black |
| Measurement Source | - | Brent Butterworth |
| Frequency Response | - | 19Hz-300Hz |
| Output SPL at 16 Hz | - | 101.0 dB |
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
KRK S12.4: $839.00 Amazon eBay
Older model: the KRK Systems 12S (rated 3.9/5).
Pros: A 12-inch Kevlar woofer in a reinforced MDF cabinet with a front-firing port, driven by a 220W Class-D amplifier. A four-position selectable crossover matches it to existing studio monitors, and the included bypass footswitch mutes the sub and sends full-range audio to the monitors for mix checks.
Cons: No independent measurements yet, so its output can’t be compared with ranked subwoofers. It is built as a studio monitor partner, so its controls suit a desk setup more than a home theater receiver.
Full KRK S12.4 review and specifications →
| Amplifier Power | 220W |
|---|---|
| Country | United States |
| Drivers | 12” Kevlar driver |
| Enclosure | ported, front |
- Links
- Reviews, Comparisons and Sound Samples
- These figures are manufacturer-specified rather than independently measured.
- Head-to-Head Comparisons
Rythmik LV12: $899 Rythmik Audio eBay
Pros: 12-inch ported with 300W RMS, direct servo control extends 19Hz. Switchable Q settings (19Hz Low/22Hz Med/24Hz High) adjust bass response and loudness. 5-year driver warranty. Phase and crossover controls for flexible integration.
Full Rythmik LV12 review and specifications →
| Amplifier Power | 300W RMS |
|---|---|
| CEA-2010-A Average (40-80Hz) | 120.3 dB |
| Cabinet Color | black |
| Country | United States |
| Dimensions | 19.5”H x 15”W x 18.5”D (495.3 x 381.0 x 469.9 mm) |
| Drivers | 12” (305mm) driver |
| Enclosure | ported, front |
| Frequency Response | 19Hz-300Hz |
| Measurement Source | Brent Butterworth |
| Output SPL at 16 Hz | 101.0 dB |
| Output SPL at 20 Hz | 107.7 dB |
| Output SPL at 25 Hz | 113.2 dB |
| Output SPL at 31.5 Hz | 116.6 dB |
| Output SPL at 40 Hz | 120.2 dB |
| Output SPL at 50 Hz | 120.4 dB |
| Output SPL at 63 Hz | 121.2 dB |
| Output SPL at 80 Hz | 119.3 dB |
| Warranty | 5/3 |
| Weight | 69 lbs (31.3 kg) |
- 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