HSU Research VTF-15H MK2 vs Rythmik F18

Last updated: September 17, 2026

Short answer: the HSU Research VTF-15H MK2. It ranks #50 of 110 subwoofers by sound quality, rated 4.2/5, at $1499; the Rythmik F18 ranks #69, rated 4.1/5, and costs $2344, so there is little reason to consider the other one.

HSU Research VTF-15H MK2 vs Rythmik F18

On the HSU Research VTF-15H MK2 side: 15-inch ported driver delivers 121.8dB CEA-2010-A average from HSU Research’s long-running VTF series. The catch: Ported enclosure prone to room modes at certain frequencies, mid-large 50 kg (110.2 lbs) size, and $1,500 price point.

Buy the HSU Research VTF-15H MK2. It is rated higher for sound quality than the Rythmik F18 and costs less, so the other one has nothing left to offer.

Still deciding? The full Subwoofers rankings cover every ranked option.

Buy the Rythmik F18 at Rythmik Audio ($2,344) →

Specifications Side By Side

HSU Research VTF-15H MK2 Rythmik F18
Price$1,499$1,850
Ranked#50 of 110 in Large Home Subwoofers (Over 75 lbs)#69 of 110 in Large Home Subwoofers (Over 75 lbs)
Enclosureported, frontsealed
Output SPL at 15 Hz101.6 dB102.0 dB
Output SPL at 20 Hz108.4 dB106.2 dB
Output SPL at 25 Hz114.8 dB110.9 dB
Output SPL at 31.5 Hz119.4 dB114.3 dB
Output SPL at 40 Hz122.9 dB117.1 dB
Output SPL at 50 Hz122.5 dB119.1 dB
Output SPL at 63 Hz121.1 dB120.5 dB
Output SPL at 80 Hz120.5 dB121.2 dB
CEA-2010-A Average (40-80Hz)121.8 dB119.5 dB
Dimensions24"H x 18"W x 26"D (609.6 x 457.2 x 660.4 mm)20.5"H x 20.5"W x 21"D (520.7 x 520.7 x 533.4 mm)
Weight110 lbs (49.9 kg)115.1 lbs (52.2 kg)
Warranty7/2(+3)5/3
Cabinet Colorblack, woodblack
CountryUnited StatesUnited States
Measurement SourceManufacturerData-bass
Drivers15" (381mm) driver18" (457mm) driver
Output SPL at 10 Hz-93.7 dB
Output SPL at 12.5 Hz-97.4 dB
Output SPL at 100 Hz-121.4 dB
Output SPL at 125 Hz-121.4 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
Buy the Rythmik F18 at Rythmik Audio ($2,344) →

More top alternatives to HSU Research VTF-15H MK2:

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The Two Speakers In Full

HSU Research VTF-15H MK2: $1,499 eBay

HSU Research VTF-15H MK2 ranking card

Pros: 15-inch ported driver delivers 121.8dB CEA-2010-A average from HSU Research’s long-running VTF series.

Cons: Ported enclosure prone to room modes at certain frequencies, mid-large 50 kg size, and $1499 price point.

Notes: Price includes shipping

Full HSU Research VTF-15H MK2 review and specifications →

CEA-2010-A Average (40-80Hz)121.8 dB
Cabinet Colorblack, wood
CountryUnited States
Dimensions24"H x 18"W x 26"D (609.6 x 457.2 x 660.4 mm)
Drivers15" (381mm) driver
Enclosureported, front
Measurement SourceManufacturer
Output SPL at 15 Hz101.6 dB
Output SPL at 20 Hz108.4 dB
Output SPL at 25 Hz114.8 dB
Output SPL at 31.5 Hz119.4 dB
Output SPL at 40 Hz122.9 dB
Output SPL at 50 Hz122.5 dB
Output SPL at 63 Hz121.1 dB
Output SPL at 80 Hz120.5 dB
Warranty7/2(+3)
Weight110 lbs (49.9 kg)
Search eBay for HSU Research VTF-15H MK2 →

Rythmik F18: $1,850 Rythmik Audio eBay

Rythmik F18 ranking card

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 →

AES InputNo
Aux InputNo
CEA-2010-A Average (40-80Hz)119.5 dB
Cabinet Colorblack
Coaxial InputNo
CountryUnited States
Dimensions20.5"H x 20.5"W x 21"D (520.7 x 520.7 x 533.4 mm)
Drivers18" (457mm) driver
Enclosuresealed
HDMI InputNo
InputsXLR (2), RCA (line/LFE)
Measurement SourceData-bass
Optical InputNo
Output SPL at 10 Hz93.7 dB
Output SPL at 12.5 Hz97.4 dB
Output SPL at 15 Hz102.0 dB
Output SPL at 20 Hz106.2 dB
Output SPL at 25 Hz110.9 dB
Output SPL at 31.5 Hz114.3 dB
Output SPL at 40 Hz117.1 dB
Output SPL at 50 Hz119.1 dB
Output SPL at 63 Hz120.5 dB
Output SPL at 80 Hz121.2 dB
Output SPL at 100 Hz121.4 dB
Output SPL at 125 Hz121.4 dB
RCA InputYes
TRS InputNo
USB InputNo
Warranty5/3
Weight115.1 lbs (52.2 kg)
XLR InputYes
Check current price at Rythmik Audio ($2,344) →Search eBay for Rythmik F18 →