Short answer: the Rythmik FV15HP on measured sound quality, the HSU Research VTF-3 MK3 on price. The Rythmik FV15HP ranks #48 of 110 subwoofers at $2127. The HSU Research VTF-3 MK3 ranks #97 at $1499, $628 cheaper.
What the Rythmik FV15HP offers: 15-inch ported driver reaches 122.0dB CEA-2010-A average, matching the output of subwoofers costing significantly more. Watch for: Premium price ($1,770), ported design room gain dependency, and mid-to-large 52 kg footprint.
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 FV15HP when sound quality outweighs the price for you, and the HSU Research VTF-3 MK3 when the price outweighs sound quality instead.
The HSU Research VTF-3 MK3 is not a sound-quality pick. It sits near the bottom of the 110 subwoofers; there are better options higher up.
Want more options? Browse the full Subwoofers rankings.
Specifications Side By Side
| Rythmik FV15HP | HSU Research VTF-3 MK3 | |
|---|---|---|
| Price | $1,770 | $1499 |
| Ranked | #48 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 12.5 Hz | 92.8 dB | - |
| Output SPL at 15 Hz | 105.1 dB | 88.5 dB |
| Output SPL at 20 Hz | 111.1 dB | 104.3 dB |
| Output SPL at 25 Hz | 116.1 dB | 108.7 dB |
| Output SPL at 31.5 Hz | 120.0 dB | 109.7 dB |
| Output SPL at 40 Hz | 122.5 dB | 112.1 dB |
| Output SPL at 50 Hz | 122.1 dB | 113.7 dB |
| Output SPL at 63 Hz | 121.8 dB | 114.0 dB |
| Output SPL at 80 Hz | 121.4 dB | 114.0 dB |
| Output SPL at 100 Hz | 121.2 dB | - |
| Output SPL at 125 Hz | 121.1 dB | - |
| CEA-2010-A Average (40-80Hz) | 122.0 dB | 113.5 dB |
| Dimensions | 24.5"H x 18.2"W x 24.2"D (622.3 x 463.5 x 615.9 mm) | 21.5"H x 17"W x 25"D (546.1 x 431.8 x 635.0 mm) |
| Weight | 115.1 lbs (52.2 kg) | 89.9 lbs (40.8 kg) |
| Warranty | 5/3 | - |
| Cabinet Color | black, white | - |
| Country | United States | United States |
| Measurement Source | Audioholics | Ilkka Rissanen |
| Drivers | 15" (381mm) driver | 12" (305mm) driver |
Related Speaker Comparisons
More worthwhile head-to-heads for Rythmik FV15HP:
- JTR Speakers Orbit Shifter PRO vs Rythmik FV15HP
- JTR Speakers Orbit Shifter LFU vs Rythmik FV15HP
- Power Sound Audio (PSA) TRIAX vs Rythmik FV15HP
- JTR Speakers Captivator 4000ULF vs Rythmik FV15HP
- JTR Speakers Captivator S2 vs Rythmik FV15HP
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 FV15HP: $1,770 Rythmik Audio eBay
Pros: 15-inch ported driver reaches 122.0dB CEA-2010-A average, matching the output of subwoofers costing significantly more.
Cons: Premium price ($1,770), ported design room gain dependency, and mid-to-large 52 kg footprint.
Full Rythmik FV15HP review and specifications →
| CEA-2010-A Average (40-80Hz) | 122.0 dB |
|---|---|
| Cabinet Color | black, white |
| Country | United States |
| Dimensions | 24.5"H x 18.2"W x 24.2"D (622.3 x 463.5 x 615.9 mm) |
| Drivers | 15" (381mm) driver |
| Enclosure | ported, front |
| Measurement Source | Audioholics |
| Output SPL at 12.5 Hz | 92.8 dB |
| Output SPL at 15 Hz | 105.1 dB |
| Output SPL at 20 Hz | 111.1 dB |
| Output SPL at 25 Hz | 116.1 dB |
| Output SPL at 31.5 Hz | 120.0 dB |
| Output SPL at 40 Hz | 122.5 dB |
| Output SPL at 50 Hz | 122.1 dB |
| Output SPL at 63 Hz | 121.8 dB |
| Output SPL at 80 Hz | 121.4 dB |
| Output SPL at 100 Hz | 121.2 dB |
| Output SPL at 125 Hz | 121.1 dB |
| Warranty | 5/3 |
| Weight | 115.1 lbs (52.2 kg) |
- Links
- Reviews, Comparisons and Sound Samples
- Independently measured by Audioholics; the published figures above come from this ASR subwoofer measurement thread.
- Head-to-Head Comparisons
- Rythmik FV15HP vs JTR Speakers Captivator RS1
- Rythmik FV15HP vs HSU Research VTF-15H MK2
- Rythmik FV15HP vs HSU Research VTF-3 MK5 HP
- Rythmik FV15HP vs SVS PB-4000
- Rythmik FV15HP vs Monoprice Monolith M-15 V2
- Rythmik FV15HP vs JTR Speakers Captivator 1400
- Rythmik FV15HP vs Rythmik F18
- Rythmik FV15HP vs Monoprice Monolith M15-S
- See all 24 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