Monoprice Monolith M-15 V2 Review: Rated 4.2/5

Last updated: October 21, 2026

The Monoprice Monolith M-15 V2 is rated 4.2/5 for sound quality, #71 of 143 Large Home Subwoofers (Over 75 lbs). See all Subwoofers rankings for every top pick.

Monoprice Monolith M-15 V2 · Editor's rating 4.2/5, ranked #71 of 143 Large Home Subwoofers (Over 75 lbs)

Prices on this page were last checked October 28, 2026 at 1:06 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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Brand: Monoprice

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

Older model: the Monoprice Monolith 15 THX Ultra (ranked higher, rated 4.2/5). See every Monoprice Monolith generation.

Same family: the Monoprice Monolith M-10 V2 (smaller subwoofer, rated 3.4/5) and the Monoprice Monolith M-12 V2 (smaller subwoofer, ranked lower, rated 3.8/5).

Pros: A 15 inch ported subwoofer with strong deep bass and midbass headroom for movies, a good value used. 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.

Notes: Product # 42851

Is the Monoprice Monolith M-15 V2 right for you?

Skip it if

  • you need to move it often (60 kg each).
  • you want to buy it new: it is discontinued.
ReleasedNov 2021 (4 years ago)
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)
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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