Short answer: the Monoprice SW-12 for output on a budget, the Rythmik F12 for a sealed servo design. The SW-12 is a 12-inch ported sub with 400W RMS (600W peak) and a 112.3 dB output figure, but entry-level build and ported room interaction are the tradeoffs. The Rythmik is a sealed 12-inch servo with 370W RMS and excellent value.
On the Monoprice SW-12 side: 12-inch ported with 400W RMS (600W peak) on a budget at just $230. Hits hard with clean tight transient response. Set against that: Entry-level build quality, ported enclosure room interaction, and lower 112.3 dB output capability.
The case for the Rythmik F12: Sealed 12-inch servo with 370W RMS offers excellent value.
Buy the Monoprice SW-12. It is rated higher for sound quality than the Rythmik F12 and costs less, so the other one has nothing left to offer.
Want more options? Browse the full Subwoofers rankings.
Specifications Side By Side
| Monoprice SW-12 | Rythmik F12 | |
|---|---|---|
| Price | $166.73 | $1,120 |
| Ranked | #5 of 145 in Medium Home Subwoofers (30-75 lbs) | #20 of 145 in Medium Home Subwoofers (30-75 lbs) |
| Enclosure | ported, bottom | sealed |
| Output SPL at 20 Hz | 102.7 dB | 103.6 dB |
| Output SPL at 25 Hz | 111.1 dB | 106.7 dB |
| Output SPL at 31.5 Hz | 115.2 dB | 113.5 dB |
| Output SPL at 40 Hz | 119.0 dB | 118.3 dB |
| Output SPL at 50 Hz | 119.7 dB | 119.1 dB |
| Output SPL at 63 Hz | 122.9 dB | 120.4 dB |
| Output SPL at 80 Hz | 123.0 dB | 119.6 dB |
| CEA-2010-A Average (40-80Hz) | 121.2 dB | 119.3 dB |
| Dimensions | 14.9"H x 18.3"W x 19.1"D (378.5 x 464.8 x 485.1 mm) | 15.7"H x 15.7"W x 17"D (400.0 x 400.0 x 431.8 mm) |
| Weight | 50.7 lbs (23.0 kg) | 75 lbs (34.0 kg) |
| Warranty | 1 | 5/3 |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Brent Butterworth | Brent Butterworth |
| Frequency Response | 35-150Hz, -10dB | 14Hz extension |
| Amplifier Power | 400W RMS / 600W peak | 370W RMS |
| Drivers | 12" (305mm) driver | 12" (305mm) driver |
| Output SPL at 16 Hz | 90.6 dB | 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 |
Related Speaker Comparisons
More worthwhile head-to-heads for Monoprice SW-12:
- JTR Speakers Captivator 212PRO vs Monoprice SW-12
- MartinLogan Dynamo 1600X vs Monoprice SW-12
- HSU Research ULS-15 MK2 vs Monoprice SW-12
- Monoprice SW-12 vs Power Sound Audio (PSA) XV15
- Monoprice SW-12 vs Monoprice SW-15
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
Monoprice SW-12: $166.73 Amazon eBay
Pros: 12-inch ported with 400W RMS (600W peak) on a budget at just $167. Hits hard with clean tight transient response. Variable crossover and volume controls for setup flexibility. Speaker-level and line-level inputs for easy integration.
Cons: Entry-level build quality, ported enclosure room interaction, and lower 112.3 dB output capability.
Notes: Product # 41498
Full Monoprice SW-12 review and specifications →
| Amplifier Power | 400W RMS / 600W peak |
|---|---|
| CEA-2010-A Average (40-80Hz) | 121.2 dB |
| Cabinet Color | black |
| Country | United States |
| Dimensions | 14.9"H x 18.3"W x 19.1"D (378.5 x 464.8 x 485.1 mm) |
| Drivers | 12" (305mm) driver |
| Enclosure | ported, bottom |
| Frequency Response | 35-150Hz, -10dB |
| Measurement Source | Brent Butterworth |
| Output SPL at 16 Hz | 90.6 dB |
| Output SPL at 20 Hz | 102.7 dB |
| Output SPL at 25 Hz | 111.1 dB |
| Output SPL at 31.5 Hz | 115.2 dB |
| Output SPL at 40 Hz | 119.0 dB |
| Output SPL at 50 Hz | 119.7 dB |
| Output SPL at 63 Hz | 122.9 dB |
| Output SPL at 80 Hz | 123.0 dB |
| Warranty | 1 |
| Weight | 50.7 lbs (23.0 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
- Monoprice SW-12 vs HSU Research ULS-15 MK2
- Monoprice SW-12 vs MartinLogan Dynamo 1600X
- Monoprice SW-12 vs JTR Speakers Captivator 212PRO
- Monoprice SW-12 vs Power Sound Audio (PSA) XV15
- Monoprice SW-12 vs Monoprice SW-15
- Monoprice SW-12 vs SVS SB-3000
- Monoprice SW-12 vs Klipsch SPL-120
- Monoprice SW-12 vs Power Sound Audio (PSA) XS15SE
- See all 19 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