HSU Research VTF-3 MK3 vs Monoprice Monolith M-215

Last updated: September 16, 2026

Short answer: the Monoprice Monolith M-215 on measured sound quality, the HSU Research VTF-3 MK3 on price. The Monoprice Monolith M-215 ranks #23 of 110 subwoofers at $2999.99. The HSU Research VTF-3 MK3 ranks #97 at $1499, $1500.99 cheaper.

HSU Research VTF-3 MK3 vs Monoprice Monolith M-215

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.

What the Monoprice Monolith M-215 offers: Independent CEA-2010 testing records 118.9 dB at 20 Hz and 125.9 dB through 40-80 Hz. The ported, front enclosure with 2x 15” (381mm) drivers has the headroom for demanding film bass in a large room. Watch for: The 1074.4H x 508.0W x 701.0D mm cabinet and 98.0 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.

Buy the HSU Research VTF-3 MK3 when the price outweighs sound quality for you, and the Monoprice Monolith M-215 when sound quality outweighs the price instead.

If sound quality matters at all to you, skip the HSU Research VTF-3 MK3. It ranks near the bottom of the 110 subwoofers, so look higher up the list instead.

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

Buy the Monoprice Monolith M-215 at Monoprice ($2999.99) →

Specifications Side By Side

HSU Research VTF-3 MK3 Monoprice Monolith M-215
Price$1499$2999.99
Ranked#97 of 110 in Large Home Subwoofers (Over 75 lbs)#23 of 110 in Large Home Subwoofers (Over 75 lbs)
Enclosureported, rearported, front
Output SPL at 15 Hz88.5 dB113.1 dB
Output SPL at 20 Hz104.3 dB118.9 dB
Output SPL at 25 Hz108.7 dB122.6 dB
Output SPL at 31.5 Hz109.7 dB125.2 dB
Output SPL at 40 Hz112.1 dB126.4 dB
Output SPL at 50 Hz113.7 dB126.1 dB
Output SPL at 63 Hz114.0 dB125.6 dB
Output SPL at 80 Hz114.0 dB125.6 dB
CEA-2010-A Average (40-80Hz)113.5 dB125.9 dB
Dimensions21.5"H x 17"W x 25"D (546.1 x 431.8 x 635.0 mm)42.3"H x 20"W x 27.6"D (1074.4 x 508.0 x 701.0 mm)
Weight89.9 lbs (40.8 kg)216.1 lbs (98.0 kg)
CountryUnited StatesUnited States
Measurement SourceIlkka RissanenBrent Butterworth
Drivers12" (305mm) driver2x 15" (381mm) drivers
Output SPL at 12.5 Hz-103.9 dB
Output SPL at 100 Hz-125.7 dB
Output SPL at 125 Hz-126.3 dB
Warranty-5
Cabinet Color-black
Buy the Monoprice Monolith M-215 at Monoprice ($2999.99) →

How Monoprice Monolith M-215 compares with other leading options:

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.

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The Two Speakers In Full

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 →

Monoprice Monolith M-215: $2999.99 Monoprice eBay

Monoprice Monolith M-215 ranking card

Pros: Independent CEA-2010 testing records 118.9 dB at 20 Hz and 125.9 dB through 40-80 Hz. The ported, front enclosure with 2x 15” (381mm) drivers has the headroom for demanding film bass in a large room.

Cons: The 1074.4H x 508.0W x 701.0D mm cabinet and 98.0 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.

Notes: Product # 38543

Full Monoprice Monolith M-215 review and specifications →

CEA-2010-A Average (40-80Hz)125.9 dB
Cabinet Colorblack
CountryUnited States
Dimensions42.3"H x 20"W x 27.6"D (1074.4 x 508.0 x 701.0 mm)
Drivers2x 15" (381mm) drivers
Enclosureported, front
Measurement SourceBrent Butterworth
Output SPL at 12.5 Hz103.9 dB
Output SPL at 15 Hz113.1 dB
Output SPL at 20 Hz118.9 dB
Output SPL at 25 Hz122.6 dB
Output SPL at 31.5 Hz125.2 dB
Output SPL at 40 Hz126.4 dB
Output SPL at 50 Hz126.1 dB
Output SPL at 63 Hz125.6 dB
Output SPL at 80 Hz125.6 dB
Output SPL at 100 Hz125.7 dB
Output SPL at 125 Hz126.3 dB
Warranty5
Weight216.1 lbs (98.0 kg)
Check current price at Monoprice ($2999.99) →Search eBay for Monoprice Monolith M-215 →