Monoprice Monolith M-15 V2 vs Rythmik FV15HP

Last updated: September 17, 2026

Short answer: the Rythmik FV15HP, if you are buying new. The Monoprice Monolith M-15 V2 measures as well as it (#64 vs #48 of 110 subwoofers, 4.2/5 vs 4.2/5) but is discontinued, so only consider it used; the Rythmik FV15HP is still sold new at $2127.

Monoprice Monolith M-15 V2 vs Rythmik FV15HP

What the Rythmik FV15HP gets right: 15-inch ported driver reaches 122.0dB CEA-2010-A average, matching the output of subwoofers costing significantly more. The catch: Premium price ($1,770), ported design room gain dependency, and mid-to-large 52 kg (114.6 lbs) footprint.

Buy the Rythmik FV15HP 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.

Buy the Rythmik FV15HP at Rythmik Audio ($2,127) →

Specifications Side By Side

Monoprice Monolith M-15 V2 Rythmik FV15HP
Price$1,500 Discontinued$1,770
Ranked#64 of 110 in Large Home Subwoofers (Over 75 lbs)#48 of 110 in Large Home Subwoofers (Over 75 lbs)
Enclosureported, frontported, front
Output SPL at 12.5 Hz91.0 dB92.8 dB
Output SPL at 15 Hz106.3 dB105.1 dB
Output SPL at 20 Hz112.6 dB111.1 dB
Output SPL at 25 Hz116.6 dB116.1 dB
Output SPL at 31.5 Hz119.5 dB120.0 dB
Output SPL at 40 Hz120.9 dB122.5 dB
Output SPL at 50 Hz120.6 dB122.1 dB
Output SPL at 63 Hz120.0 dB121.8 dB
Output SPL at 80 Hz118.7 dB121.4 dB
Output SPL at 100 Hz120.1 dB121.2 dB
Output SPL at 125 Hz120.2 dB121.1 dB
CEA-2010-A Average (40-80Hz)120.0 dB122.0 dB
Dimensions28.7"H x 17.7"W x 26.8"D (729.0 x 449.6 x 680.7 mm)24.5"H x 18.2"W x 24.2"D (622.3 x 463.5 x 615.9 mm)
Weight132.9 lbs (60.3 kg)115.1 lbs (52.2 kg)
Warranty55/3
Cabinet Colorblackblack, white
CountryUnited StatesUnited States
Measurement SourceManufacturerAudioholics
Drivers15" (381mm) driver15" (381mm) driver
DiscontinuedYes-
InputsXLR, RCAXLR (2), RCA (line/LFE)
XLR InputYesYes
RCA InputYesYes
TRS InputNoNo
Optical InputNoNo
Coaxial InputNoNo
USB InputNoNo
HDMI InputNoNo
AES InputNoNo
Aux InputNoNo
Buy the Rythmik FV15HP at Rythmik Audio ($2,127) →

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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
Search eBay for Monoprice Monolith M-15 V2 →

Rythmik FV15HP: $1,770 Rythmik Audio eBay

Rythmik FV15HP ranking card

Pros: 15-inch ported driver reaches 122.0dB CEA-2010-A average, matching the output of subwoofers costing significantly more.

Cons: Premium price ($2127), ported design room gain dependency, and mid-to-large 52 kg footprint.

Full Rythmik FV15HP review and specifications →

AES InputNo
Aux InputNo
CEA-2010-A Average (40-80Hz)122.0 dB
Cabinet Colorblack, white
Coaxial InputNo
CountryUnited States
Dimensions24.5"H x 18.2"W x 24.2"D (622.3 x 463.5 x 615.9 mm)
Drivers15" (381mm) driver
Enclosureported, front
HDMI InputNo
InputsXLR (2), RCA (line/LFE)
Measurement SourceAudioholics
Optical InputNo
Output SPL at 12.5 Hz92.8 dB
Output SPL at 15 Hz105.1 dB
Output SPL at 20 Hz111.1 dB
Output SPL at 25 Hz116.1 dB
Output SPL at 31.5 Hz120.0 dB
Output SPL at 40 Hz122.5 dB
Output SPL at 50 Hz122.1 dB
Output SPL at 63 Hz121.8 dB
Output SPL at 80 Hz121.4 dB
Output SPL at 100 Hz121.2 dB
Output SPL at 125 Hz121.1 dB
RCA InputYes
TRS InputNo
USB InputNo
Warranty5/3
Weight115.1 lbs (52.2 kg)
XLR InputYes
Check current price at Rythmik Audio ($2,127) →Search eBay for Rythmik FV15HP →