Monoprice Monolith M-215 vs Rythmik FV15HP

Last updated: September 17, 2026

Short answer: the Monoprice Monolith M-215. It ranks #23 of 110 subwoofers by sound quality, rated 4.4/5, at $2999.99. The Rythmik FV15HP ranks #48, rated 4.2/5, at $2127, $872.99 cheaper, a saving that is not big enough to make up the sound-quality gap.

Monoprice Monolith M-215 vs Rythmik FV15HP

On the Rythmik FV15HP side: 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 Monoprice Monolith M-215. It is rated higher for sound quality, and the $872.99 saving on the Rythmik FV15HP is not enough to make up the difference.

Looking for alternatives? See the complete Subwoofers rankings.

Buy the Monoprice Monolith M-215 at Monoprice ($2999.99) →Buy the Rythmik FV15HP at Rythmik Audio ($2,127) →

Specifications Side By Side

Monoprice Monolith M-215 Rythmik FV15HP
Price$2999.99$1,770
Ranked#23 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 Hz103.9 dB92.8 dB
Output SPL at 15 Hz113.1 dB105.1 dB
Output SPL at 20 Hz118.9 dB111.1 dB
Output SPL at 25 Hz122.6 dB116.1 dB
Output SPL at 31.5 Hz125.2 dB120.0 dB
Output SPL at 40 Hz126.4 dB122.5 dB
Output SPL at 50 Hz126.1 dB122.1 dB
Output SPL at 63 Hz125.6 dB121.8 dB
Output SPL at 80 Hz125.6 dB121.4 dB
Output SPL at 100 Hz125.7 dB121.2 dB
Output SPL at 125 Hz126.3 dB121.1 dB
CEA-2010-A Average (40-80Hz)125.9 dB122.0 dB
Dimensions42.3"H x 20"W x 27.6"D (1074.4 x 508.0 x 701.0 mm)24.5"H x 18.2"W x 24.2"D (622.3 x 463.5 x 615.9 mm)
Weight216.1 lbs (98.0 kg)115.1 lbs (52.2 kg)
Warranty55/3
Cabinet Colorblackblack, white
CountryUnited StatesUnited States
Measurement SourceBrent ButterworthAudioholics
Drivers2x 15" (381mm) drivers15" (381mm) driver
Inputs-XLR (2), RCA (line/LFE)
XLR Input-Yes
RCA Input-Yes
TRS Input-No
Optical Input-No
Coaxial Input-No
USB Input-No
HDMI Input-No
AES Input-No
Aux Input-No
Buy the Monoprice Monolith M-215 at Monoprice ($2999.99) →Buy the Rythmik FV15HP at Rythmik Audio ($2,127) →

More worthwhile head-to-heads for Monoprice Monolith M-215:

Prices on this page were last checked September 23, 2026 at 11:24 PM 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

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 →

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 →