Short answer: the Rythmik F18 on measured sound quality, the RSL (Rogersound Labs) Speedwoofer 12S on price. The Rythmik F18 ranks #69 of 110 subwoofers at $2344. The RSL (Rogersound Labs) Speedwoofer 12S ranks #98 at $800, $1544 cheaper.
What the Rythmik F18 offers: Independent CEA-2010 testing records 106.2 dB at 20 Hz and 119.5 dB through 40-80 Hz. The sealed enclosure with 18” (457mm) driver has the headroom for demanding film bass in a large room. Watch for: The 520.7H x 520.7W x 533.4D mm cabinet and 52.2 kg mass make this a serious placement and moving commitment. A sealed cabinet still needs careful placement and calibration to avoid room-mode peaks.
What the RSL (Rogersound Labs) Speedwoofer 12S offers: Independent CEA-2010 testing records 109.3 dB at 20 Hz and 113.2 dB through 40-80 Hz. The ported, rear enclosure with 12” (305mm) driver has the headroom for demanding film bass in a large room. Watch for: The 565.1H x 479.4W x 562.0D mm cabinet and 37.2 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.
Buy the Rythmik F18 if sound quality is the priority over the price, or the RSL (Rogersound Labs) Speedwoofer 12S if the price is the priority over sound quality.
The RSL (Rogersound Labs) Speedwoofer 12S is not a sound-quality pick. It sits near the bottom of the 110 subwoofers; there are better options higher up.
Still deciding? The full Subwoofers rankings cover every ranked option.
Specifications Side By Side
| Rythmik F18 | RSL (Rogersound Labs) Speedwoofer 12S | |
|---|---|---|
| Price | $1,850 | $800 |
| Ranked | #69 of 110 in Large Home Subwoofers (Over 75 lbs) | #98 of 110 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | sealed | ported, rear |
| Output SPL at 10 Hz | 93.7 dB | - |
| Output SPL at 12.5 Hz | 97.4 dB | - |
| Output SPL at 15 Hz | 102.0 dB | 104.4 dB |
| Output SPL at 20 Hz | 106.2 dB | 109.3 dB |
| Output SPL at 25 Hz | 110.9 dB | 110.9 dB |
| Output SPL at 31.5 Hz | 114.3 dB | 112.5 dB |
| Output SPL at 40 Hz | 117.1 dB | 113.4 dB |
| Output SPL at 50 Hz | 119.1 dB | 113.4 dB |
| Output SPL at 63 Hz | 120.5 dB | 113.0 dB |
| Output SPL at 80 Hz | 121.2 dB | 113.1 dB |
| Output SPL at 100 Hz | 121.4 dB | 112.2 dB |
| Output SPL at 125 Hz | 121.4 dB | - |
| CEA-2010-A Average (40-80Hz) | 119.5 dB | 113.2 dB |
| Dimensions | 20.5"H x 20.5"W x 21"D (520.7 x 520.7 x 533.4 mm) | 22.2"H x 18.9"W x 22.1"D (565.1 x 479.4 x 562.0 mm) |
| Weight | 115.1 lbs (52.2 kg) | 82 lbs (37.2 kg) |
| Warranty | 5/3 | ? |
| Cabinet Color | black | black, white |
| Country | United States | United States |
| Measurement Source | Data-bass | ErinsAudioCorner |
| Drivers | 18" (457mm) driver | 12" (305mm) driver |
Related Speaker Comparisons
More worthwhile head-to-heads for Rythmik F18:
- JTR Speakers Orbit Shifter PRO vs Rythmik F18
- JTR Speakers Orbit Shifter LFU vs Rythmik F18
- Power Sound Audio (PSA) TRIAX vs Rythmik F18
- JTR Speakers Captivator 4000ULF vs Rythmik F18
- JTR Speakers Captivator S2 vs Rythmik F18
Prices on this page were last checked September 16, 2026 at 12:41 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.
As an eBay Partner, we may be compensated if you make a purchase.
The Two Speakers In Full
Rythmik F18: $1,850 Rythmik Audio eBay
Pros: Independent CEA-2010 testing records 106.2 dB at 20 Hz and 119.5 dB through 40-80 Hz. The sealed enclosure with 18” (457mm) driver has the headroom for demanding film bass in a large room.
Cons: The 520.7H x 520.7W x 533.4D mm cabinet and 52.2 kg mass make this a serious placement and moving commitment. A sealed cabinet still needs careful placement and calibration to avoid room-mode peaks.
Full Rythmik F18 review and specifications →
| CEA-2010-A Average (40-80Hz) | 119.5 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 20.5"H x 20.5"W x 21"D (520.7 x 520.7 x 533.4 mm) |
| Drivers | 18" (457mm) driver |
| Enclosure | sealed |
| Measurement Source | Data-bass |
| Output SPL at 10 Hz | 93.7 dB |
| Output SPL at 12.5 Hz | 97.4 dB |
| Output SPL at 15 Hz | 102.0 dB |
| Output SPL at 20 Hz | 106.2 dB |
| Output SPL at 25 Hz | 110.9 dB |
| Output SPL at 31.5 Hz | 114.3 dB |
| Output SPL at 40 Hz | 117.1 dB |
| Output SPL at 50 Hz | 119.1 dB |
| Output SPL at 63 Hz | 120.5 dB |
| Output SPL at 80 Hz | 121.2 dB |
| Output SPL at 100 Hz | 121.4 dB |
| Output SPL at 125 Hz | 121.4 dB |
| Warranty | 5/3 |
| Weight | 115.1 lbs (52.2 kg) |
- 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
- Rythmik F18 vs Perlisten Audio R212s
- Rythmik F18 vs Monoprice Monolith M15-S
- Rythmik F18 vs Monoprice Monolith M-15 V2
- Rythmik F18 vs SVS PB-4000
- Rythmik F18 vs HSU Research VTF-3 MK5 HP
- Rythmik F18 vs HSU Research VTF-15H MK2
- Rythmik F18 vs Rythmik FV15HP
- Rythmik F18 vs HSU Research VTF-3 MK3
- See all 24 comparisons
RSL (Rogersound Labs) Speedwoofer 12S: $800 eBay
Pros: Independent CEA-2010 testing records 109.3 dB at 20 Hz and 113.2 dB through 40-80 Hz. The ported, rear enclosure with 12” (305mm) driver has the headroom for demanding film bass in a large room.
Cons: The 565.1H x 479.4W x 562.0D mm cabinet and 37.2 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 RSL (Rogersound Labs) Speedwoofer 12S review and specifications →
| CEA-2010-A Average (40-80Hz) | 113.2 dB |
|---|---|
| Cabinet Color | black, white |
| Country | United States |
| Dimensions | 22.2"H x 18.9"W x 22.1"D (565.1 x 479.4 x 562.0 mm) |
| Drivers | 12" (305mm) driver |
| Enclosure | ported, rear |
| Measurement Source | ErinsAudioCorner |
| Output SPL at 15 Hz | 104.4 dB |
| Output SPL at 20 Hz | 109.3 dB |
| Output SPL at 25 Hz | 110.9 dB |
| Output SPL at 31.5 Hz | 112.5 dB |
| Output SPL at 40 Hz | 113.4 dB |
| Output SPL at 50 Hz | 113.4 dB |
| Output SPL at 63 Hz | 113.0 dB |
| Output SPL at 80 Hz | 113.1 dB |
| Output SPL at 100 Hz | 112.2 dB |
| Warranty | ? |
| Weight | 82 lbs (37.2 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by ErinsAudioCorner; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons
- RSL (Rogersound Labs) Speedwoofer 12S vs HSU Research VTF-3 MK3
- RSL (Rogersound Labs) Speedwoofer 12S vs BK Electronics Monolith-DF
- RSL (Rogersound Labs) Speedwoofer 12S vs SVS SB13-Plus
- RSL (Rogersound Labs) Speedwoofer 12S vs SVS PB-4000
- RSL (Rogersound Labs) Speedwoofer 12S vs Rythmik FV15HP
- RSL (Rogersound Labs) Speedwoofer 12S vs JTR Speakers Captivator 1400
- RSL (Rogersound Labs) Speedwoofer 12S vs Monoprice Monolith M-215
- RSL (Rogersound Labs) Speedwoofer 12S vs Rythmik FV25HP
- See all 13 comparisons