Monoprice Monolith 16 THX Ultra vs HSU Research VTF-3 MK3

Last updated: September 14, 2026

Short answer: the Monoprice Monolith 16 THX Ultra if sound quality matters most, the HSU Research VTF-3 MK3 if price matters most. The Monoprice Monolith 16 THX Ultra ranks #18 of 110 subwoofers at $2300. The HSU Research VTF-3 MK3 ranks #97 at $1499, $801 cheaper.

Monoprice Monolith 16 THX Ultra vs HSU Research VTF-3 MK3

What the Monoprice Monolith 16 THX Ultra offers: 16-inch ported driver and THX Ultra certification deliver 126.5dB CEA-2010-A average at a fraction of the price of the subwoofers ranked above it. Watch for: Heavy at 78 kg and ported design can interact with room acoustics.

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 Monoprice Monolith 16 THX Ultra 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.

Looking for alternatives? See the complete Subwoofers rankings.

Specifications Side By Side

Monoprice Monolith 16 THX Ultra HSU Research VTF-3 MK3
Price$2,300$1499
Ranked#18 of 110 in Large Home Subwoofers (Over 75 lbs)#97 of 110 in Large Home Subwoofers (Over 75 lbs)
Enclosureported, frontported, rear
Output SPL at 15 Hz107.3 dB88.5 dB
Output SPL at 20 Hz118.4 dB104.3 dB
Output SPL at 25 Hz123.3 dB108.7 dB
Output SPL at 31.5 Hz125.1 dB109.7 dB
Output SPL at 40 Hz126.3 dB112.1 dB
Output SPL at 50 Hz126.5 dB113.7 dB
Output SPL at 63 Hz126.6 dB114.0 dB
Output SPL at 80 Hz126.8 dB114.0 dB
Output SPL at 100 Hz127.2 dB-
Output SPL at 125 Hz127.6 dB-
CEA-2010-A Average (40-80Hz)126.5 dB113.5 dB
Dimensions25.6"H x 22"W x 28.1"D (650.2 x 558.8 x 713.7 mm)21.5"H x 17"W x 25"D (546.1 x 431.8 x 635.0 mm)
Weight171.5 lbs (77.8 kg)89.9 lbs (40.8 kg)
Warranty5-
Cabinet Colorblack-
CountryUnited StatesUnited States
Measurement SourceAudioholicsIlkka Rissanen
Drivers16" (406mm) driver12" (305mm) driver

More top alternatives to Monoprice Monolith 16 THX Ultra:

Prices on this page were last checked September 14, 2026 at 1:47 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.

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The Two Speakers In Full

Monoprice Monolith 16 THX Ultra: $2,300 eBay

Monoprice Monolith 16 THX Ultra ranking card

Pros: 16-inch ported driver and THX Ultra certification deliver 126.5dB CEA-2010-A average at a fraction of the price of the subwoofers ranked above it.

Cons: Heavy at 78 kg and ported design can interact with room acoustics.

Notes: Product # 42031

Full Monoprice Monolith 16 THX Ultra review and specifications →

CEA-2010-A Average (40-80Hz)126.5 dB
Cabinet Colorblack
CountryUnited States
Dimensions25.6"H x 22"W x 28.1"D (650.2 x 558.8 x 713.7 mm)
Drivers16" (406mm) driver
Enclosureported, front
Measurement SourceAudioholics
Output SPL at 15 Hz107.3 dB
Output SPL at 20 Hz118.4 dB
Output SPL at 25 Hz123.3 dB
Output SPL at 31.5 Hz125.1 dB
Output SPL at 40 Hz126.3 dB
Output SPL at 50 Hz126.5 dB
Output SPL at 63 Hz126.6 dB
Output SPL at 80 Hz126.8 dB
Output SPL at 100 Hz127.2 dB
Output SPL at 125 Hz127.6 dB
Warranty5
Weight171.5 lbs (77.8 kg)
Search eBay for Monoprice Monolith 16 THX Ultra →

HSU Research VTF-3 MK3: $1499 eBay

HSU Research VTF-3 MK3 ranking card

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
CountryUnited States
Dimensions21.5"H x 17"W x 25"D (546.1 x 431.8 x 635.0 mm)
Drivers12" (305mm) driver
Enclosureported, rear
Measurement SourceIlkka Rissanen
Output SPL at 15 Hz88.5 dB
Output SPL at 20 Hz104.3 dB
Output SPL at 25 Hz108.7 dB
Output SPL at 31.5 Hz109.7 dB
Output SPL at 40 Hz112.1 dB
Output SPL at 50 Hz113.7 dB
Output SPL at 63 Hz114.0 dB
Output SPL at 80 Hz114.0 dB
Weight89.9 lbs (40.8 kg)
Search eBay for HSU Research VTF-3 MK3 →