Short answer: the Rythmik FV25HP for better sound quality, the HSU Research VTF-3 MK3 for the lower price. The Rythmik FV25HP ranks #22 of 110 subwoofers at $2499. The HSU Research VTF-3 MK3 ranks #97 at $1499, $1000 cheaper.
What the Rythmik FV25HP offers: Independent CEA-2010 testing records 116.6 dB at 20 Hz and 126.2 dB through 40-80 Hz. The ported, front enclosure with 2x 15” (381mm) driver has the headroom for demanding film bass in a large room. Watch for: The 1054.1H x 533.4W x 558.8D mm cabinet and 95.3 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.
What the HSU Research VTF-3 MK3 offers: Independent CEA-2010 testing records 104.3 dB at 20 Hz and 113.5 dB through 40-80 Hz. The ported, rear enclosure with 12” (305mm) driver delivers substantial upper-bass output for movie effects and music. Watch for: Deep-bass output is more limited than the strong 40-80 Hz result suggests, so it is not the right choice when the lowest movie effects are the priority. The 546.1H x 431.8W x 635.0D mm cabinet and 40.8 kg mass still require deliberate placement and calibration.
Buy the Rythmik FV25HP if sound quality matters more than the price. Buy the HSU Research VTF-3 MK3 if the price matters more than sound quality.
Skip the HSU Research VTF-3 MK3 if sound quality matters to you. It ranks near the bottom of the 110 subwoofers.
Want more options? Browse the full Subwoofers rankings.
Specifications Side By Side
| Rythmik FV25HP | HSU Research VTF-3 MK3 | |
|---|---|---|
| Price | $2499 | $1499 |
| Ranked | #22 of 110 in Large Home Subwoofers (Over 75 lbs) | #97 of 110 in Large Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | ported, rear |
| Output SPL at 10 Hz | 99.7 dB | - |
| Output SPL at 12.5 Hz | 108.4 dB | - |
| Output SPL at 15 Hz | 113.2 dB | 88.5 dB |
| Output SPL at 20 Hz | 116.6 dB | 104.3 dB |
| Output SPL at 25 Hz | 119.1 dB | 108.7 dB |
| Output SPL at 31.5 Hz | 122.4 dB | 109.7 dB |
| Output SPL at 40 Hz | 124.7 dB | 112.1 dB |
| Output SPL at 50 Hz | 126.1 dB | 113.7 dB |
| Output SPL at 63 Hz | 126.7 dB | 114.0 dB |
| Output SPL at 80 Hz | 127.3 dB | 114.0 dB |
| Output SPL at 100 Hz | 127.9 dB | - |
| Output SPL at 125 Hz | 127.8 dB | - |
| CEA-2010-A Average (40-80Hz) | 126.2 dB | 113.5 dB |
| Dimensions | 41.5"H x 21"W x 22"D (1054.1 x 533.4 x 558.8 mm) | 21.5"H x 17"W x 25"D (546.1 x 431.8 x 635.0 mm) |
| Weight | 210.1 lbs (95.3 kg) | 89.9 lbs (40.8 kg) |
| Warranty | 5/3 | - |
| Cabinet Color | black | - |
| Country | United States | United States |
| Measurement Source | Data-bass | Ilkka Rissanen |
| Drivers | 2x 15" (381mm) driver | 12" (305mm) driver |
Related Speaker Comparisons
More worthwhile head-to-heads for Rythmik FV25HP:
- Rythmik FV25HP vs Funk Audio Ultra 24.0
- Rythmik FV25HP vs JTR Speakers Growler (2015)
- Rythmik FV25HP vs Harbinger V2218S
- Rythmik FV25HP vs Funk Audio Classic 18.0
- Monoprice Monolith 16 THX Ultra vs Rythmik FV25HP
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 FV25HP: $2499 eBay
Pros: Independent CEA-2010 testing records 116.6 dB at 20 Hz and 126.2 dB through 40-80 Hz. The ported, front enclosure with 2x 15” (381mm) driver has the headroom for demanding film bass in a large room.
Cons: The 1054.1H x 533.4W x 558.8D mm cabinet and 95.3 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 FV25HP review and specifications →
| CEA-2010-A Average (40-80Hz) | 126.2 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 41.5"H x 21"W x 22"D (1054.1 x 533.4 x 558.8 mm) |
| Drivers | 2x 15" (381mm) driver |
| Enclosure | ported, front |
| Measurement Source | Data-bass |
| Output SPL at 10 Hz | 99.7 dB |
| Output SPL at 12.5 Hz | 108.4 dB |
| Output SPL at 15 Hz | 113.2 dB |
| Output SPL at 20 Hz | 116.6 dB |
| Output SPL at 25 Hz | 119.1 dB |
| Output SPL at 31.5 Hz | 122.4 dB |
| Output SPL at 40 Hz | 124.7 dB |
| Output SPL at 50 Hz | 126.1 dB |
| Output SPL at 63 Hz | 126.7 dB |
| Output SPL at 80 Hz | 127.3 dB |
| Output SPL at 100 Hz | 127.9 dB |
| Output SPL at 125 Hz | 127.8 dB |
| Warranty | 5/3 |
| Weight | 210.1 lbs (95.3 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 FV25HP vs Monoprice Monolith M-215
- Rythmik FV25HP vs Monoprice Monolith 16 THX Ultra
- Rythmik FV25HP vs JTR Speakers Captivator 1400
- Rythmik FV25HP vs Funk Audio Classic 18.0
- Rythmik FV25HP vs Harbinger V2218S
- Rythmik FV25HP vs JTR Speakers Growler (2015)
- Rythmik FV25HP vs Funk Audio Ultra 24.0
- Rythmik FV25HP vs Rythmik FV15HP
- See all 13 comparisons
HSU Research VTF-3 MK3: $1499 eBay
Pros: Independent CEA-2010 testing records 104.3 dB at 20 Hz and 113.5 dB through 40-80 Hz. The ported, rear enclosure with 12” (305mm) driver delivers substantial upper-bass output for movie effects and music.
Cons: Deep-bass output is more limited than the strong 40-80 Hz result suggests, so it is not the right choice when the lowest movie effects are the priority. The 546.1H x 431.8W x 635.0D mm cabinet and 40.8 kg mass still require deliberate placement and calibration.
Full HSU Research VTF-3 MK3 review and specifications →
| CEA-2010-A Average (40-80Hz) | 113.5 dB |
|---|---|
| Country | United States |
| Dimensions | 21.5"H x 17"W x 25"D (546.1 x 431.8 x 635.0 mm) |
| Drivers | 12" (305mm) driver |
| Enclosure | ported, rear |
| Measurement Source | Ilkka Rissanen |
| Output SPL at 15 Hz | 88.5 dB |
| Output SPL at 20 Hz | 104.3 dB |
| Output SPL at 25 Hz | 108.7 dB |
| Output SPL at 31.5 Hz | 109.7 dB |
| Output SPL at 40 Hz | 112.1 dB |
| Output SPL at 50 Hz | 113.7 dB |
| Output SPL at 63 Hz | 114.0 dB |
| Output SPL at 80 Hz | 114.0 dB |
| Weight | 89.9 lbs (40.8 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by Ilkka Rissanen; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons
- HSU Research VTF-3 MK3 vs RSL (Rogersound Labs) Speedwoofer 12S
- HSU Research VTF-3 MK3 vs Monoprice Monolith 12 THX Ultra
- HSU Research VTF-3 MK3 vs HSU Research VTF-3 MK3 with Turbocharger
- HSU Research VTF-3 MK3 vs BK Electronics Monolith-DF
- HSU Research VTF-3 MK3 vs SVS SB13-Plus
- HSU Research VTF-3 MK3 vs Rythmik F18
- HSU Research VTF-3 MK3 vs SVS PB-4000
- HSU Research VTF-3 MK3 vs HSU Research VTF-3 MK5 HP
- See all 17 comparisons