Monoprice Monolith M-15 V2 vs Monoprice Monolith M15-S

Last updated: September 17, 2026

Short answer: the Monoprice Monolith M15-S, if you are buying new. The Monoprice Monolith M-15 V2 ranks higher than it (#64 vs #72 of 110 subwoofers, 4.2/5 vs 4.1/5) but is discontinued, so only consider it used; the Monoprice Monolith M15-S is still sold new at $999.

Monoprice Monolith M-15 V2 vs Monoprice Monolith M15-S

Buy the Monoprice Monolith M15-S new; the Monoprice Monolith M-15 V2 is no longer sold new, so it only makes sense as a used find.

Looking for alternatives? See the complete Subwoofers rankings.

Specifications Side By Side

Monoprice Monolith M-15 V2 Monoprice Monolith M15-S
Price$1,500 Discontinued$999
Ranked#64 of 110 in Large Home Subwoofers (Over 75 lbs)#72 of 110 in Large Home Subwoofers (Over 75 lbs)
Enclosureported, frontsealed
Output SPL at 12.5 Hz91.0 dB-
Output SPL at 15 Hz106.3 dB100.1 dB
Output SPL at 20 Hz112.6 dB105.6 dB
Output SPL at 25 Hz116.6 dB111.2 dB
Output SPL at 31.5 Hz119.5 dB115.2 dB
Output SPL at 40 Hz120.9 dB118.4 dB
Output SPL at 50 Hz120.6 dB119.3 dB
Output SPL at 63 Hz120.0 dB119.6 dB
Output SPL at 80 Hz118.7 dB118.9 dB
Output SPL at 100 Hz120.1 dB119.1 dB
Output SPL at 125 Hz120.2 dB118.9 dB
CEA-2010-A Average (40-80Hz)120.0 dB119.0 dB
Dimensions28.7"H x 17.7"W x 26.8"D (729.0 x 449.6 x 680.7 mm)23.5"H x 16.7"W x 19.7"D (596.9 x 424.2 x 500.4 mm)
Weight132.9 lbs (60.3 kg)80 lbs (36.3 kg)
Warranty55
Cabinet Colorblack-
CountryUnited StatesUnited States
Measurement SourceManufacturerManufacturer
Drivers15" (381mm) driver15" (381mm) driver
DiscontinuedYes-
InputsXLR, RCA-
XLR InputYes-
RCA InputYes-
TRS InputNo-
Optical InputNo-
Coaxial InputNo-
USB InputNo-
HDMI InputNo-
AES InputNo-
Aux InputNo-

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The Two Speakers In Full

Monoprice Monolith M-15 V2: $1,500 Discontinued eBay

Monoprice Monolith M-15 V2 ranking card

Pros: Published CEA-2010 specifications list 112.6 dB at 20 Hz and 120.0 dB through 40-80 Hz. Its front-ported 15-inch design has substantial deep-bass and midbass headroom for cinema playback.

Cons: Discontinued and no longer sold new. At 60.3 kg and 729.0H x 449.6W x 680.7D mm, it needs committed floor space and careful room integration. Discontinued.

Notes: Product # 42851

Full Monoprice Monolith M-15 V2 review and specifications →

AES InputNo
Aux InputNo
CEA-2010-A Average (40-80Hz)120.0 dB
Cabinet Colorblack
Coaxial InputNo
CountryUnited States
Dimensions28.7"H x 17.7"W x 26.8"D (729.0 x 449.6 x 680.7 mm)
DiscontinuedYes
Drivers15" (381mm) driver
Enclosureported, front
HDMI InputNo
InputsXLR, RCA
Measurement SourceManufacturer
Optical InputNo
Output SPL at 12.5 Hz91.0 dB
Output SPL at 15 Hz106.3 dB
Output SPL at 20 Hz112.6 dB
Output SPL at 25 Hz116.6 dB
Output SPL at 31.5 Hz119.5 dB
Output SPL at 40 Hz120.9 dB
Output SPL at 50 Hz120.6 dB
Output SPL at 63 Hz120.0 dB
Output SPL at 80 Hz118.7 dB
Output SPL at 100 Hz120.1 dB
Output SPL at 125 Hz120.2 dB
RCA InputYes
TRS InputNo
USB InputNo
Warranty5
Weight132.9 lbs (60.3 kg)
XLR InputYes
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Monoprice Monolith M15-S: $999 eBay

Monoprice Monolith M15-S ranking card

Pros: Published CEA-2010 specifications list 105.6 dB at 20 Hz and 119.0 dB through 40-80 Hz. The sealed enclosure with 15” (381mm) driver has the headroom for demanding film bass in a large room.

Cons: The 596.9H x 424.2W x 500.4D mm cabinet and 36.3 kg mass make this a serious placement and moving commitment. A sealed cabinet still needs careful placement and calibration to avoid room-mode peaks.

Notes: Product # 35141

Full Monoprice Monolith M15-S review and specifications →

CEA-2010-A Average (40-80Hz)119.0 dB
CountryUnited States
Dimensions23.5"H x 16.7"W x 19.7"D (596.9 x 424.2 x 500.4 mm)
Drivers15" (381mm) driver
Enclosuresealed
Measurement SourceManufacturer
Output SPL at 15 Hz100.1 dB
Output SPL at 20 Hz105.6 dB
Output SPL at 25 Hz111.2 dB
Output SPL at 31.5 Hz115.2 dB
Output SPL at 40 Hz118.4 dB
Output SPL at 50 Hz119.3 dB
Output SPL at 63 Hz119.6 dB
Output SPL at 80 Hz118.9 dB
Output SPL at 100 Hz119.1 dB
Output SPL at 125 Hz118.9 dB
Warranty5
Weight80 lbs (36.3 kg)
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