Monoprice Monolith 12 THX Ultra vs HSU Research VTF-3 MK3

Last updated: August 15, 2026

Short answer: the Monoprice Monolith 12 THX Ultra ranks #83 of 97 subwoofers by sound quality at $1499; the HSU Research VTF-3 MK3 ranks #86 at $1499. Close enough in price that the sound-quality gap is the deciding factor.

What the Monoprice Monolith 12 THX Ultra offers: Its documented strengths make it a credible option in this class. Watch for: Its documented strengths make it a credible option in this class.

What the HSU Research VTF-3 MK3 offers: Its documented strengths make it a credible option in this class. Watch for: Its documented strengths make it a credible option in this class.

Buy the Monoprice Monolith 12 THX Ultra. It ranks higher for sound quality than the HSU Research VTF-3 MK3 at the same price, so there is no real case for the other one.

If sound quality matters at all to you, skip both of these and look higher up the 97 subwoofers instead.

Monoprice Monolith 12 THX Ultra vs HSU Research VTF-3 MK3

Specifications Side By Side

Monoprice Monolith 12 THX Ultra HSU Research VTF-3 MK3
Price$1499$1499
Ranked#83 of 97 in Large Powered Home Subwoofers (Over 75 lbs)#86 of 97 in Large Powered Home Subwoofers (Over 75 lbs)
Enclosureported, frontported, rear
Output SPL at 12.5 Hz87.7 dB-
Output SPL at 15 Hz101.2 dB88.5 dB
Output SPL at 20 Hz108.4 dB104.3 dB
Output SPL at 25 Hz110.9 dB108.7 dB
Output SPL at 31.5 Hz113.0 dB109.7 dB
Output SPL at 40 Hz114.0 dB112.1 dB
Output SPL at 50 Hz115.0 dB113.7 dB
Output SPL at 63 Hz116.0 dB114.0 dB
Output SPL at 80 Hz116.0 dB114.0 dB
Output SPL at 100 Hz115.0 dB-
Output SPL at 125 Hz114.0 dB-
CEA-2010-A Average (40-80Hz)115.2 dB113.5 dB
Dimensions22.8"H x 16.7"W x 23.6"D (579.1 x 424.2 x 599.4 mm)21.5"H x 17"W x 25"D (546.1 x 431.8 x 635.0 mm)
Weight98.5 lbs / 44.7 kg89.9 lbs / 40.8 kg
Warranty5-
Cabinet Colorblack-
CountryUnited StatesUnited States
Measurement SourceErinsAudioCornerIlkka Rissanen
Drivers12" (305mm) driver12" (305mm) driver

More useful head-to-heads from the same speaker class:

The Two Speakers In Full

Monoprice Monolith 12 THX Ultra: $1499

Monoprice Monolith 12 THX Ultra ranking card

Notes: Product # 24457

Full Monoprice Monolith 12 THX Ultra review and specifications →

CEA-2010-A Average (40-80Hz)115.2 dB
Cabinet Colorblack
CountryUnited States
Dimensions22.8"H x 16.7"W x 23.6"D (579.1 x 424.2 x 599.4 mm)
Drivers12" (305mm) driver
Enclosureported, front
Measurement SourceErinsAudioCorner
Output SPL at 12.5 Hz87.7 dB
Output SPL at 15 Hz101.2 dB
Output SPL at 20 Hz108.4 dB
Output SPL at 25 Hz110.9 dB
Output SPL at 31.5 Hz113.0 dB
Output SPL at 40 Hz114.0 dB
Output SPL at 50 Hz115.0 dB
Output SPL at 63 Hz116.0 dB
Output SPL at 80 Hz116.0 dB
Output SPL at 100 Hz115.0 dB
Output SPL at 125 Hz114.0 dB
Warranty5
Weight98.5 lbs / 44.7 kg
Search eBay for Monoprice Monolith 12 THX Ultra →Search used audio listings for Monoprice Monolith 12 THX Ultra →

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HSU Research VTF-3 MK3: $1499

HSU Research VTF-3 MK3 ranking card

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 →Search used audio listings for HSU Research VTF-3 MK3 →

As an eBay Partner, we may be compensated if you make a purchase.