Monoprice Monolith M-215 vs SVS PB17-Ultra R-Evolution

Last updated: September 26, 2026

Short answer: the Monoprice Monolith M-215. It ranks #23 of 110 subwoofers by sound quality, rated 4.4/5, at $2,999.99. The SVS PB17-Ultra R-Evolution ranks #70, rated 4.1/5, at $2,599, $400.99 cheaper, which does not close the gap in sound quality.

Monoprice Monolith M-215 vs SVS PB17-Ultra R-Evolution

Why pick the Monoprice Monolith M-215: Independent CEA-2010 testing records 118.9 dB at 20 Hz and 125.9 dB through 40-80 Hz. 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.

Why pick the SVS PB17-Ultra R-Evolution: Independent CEA-2010 testing (Standard Mode) records 113.9 dB at 20 Hz and 119.4 dB through 40-80 Hz. The tradeoff: At 167 lbs with recessed feet that leave little clearance, moving or repositioning this cabinet is a two-person job at minimum.

Buy the Monoprice Monolith M-215. It is rated higher for sound quality, and the $400.99 you would save on the SVS PB17-Ultra R-Evolution does not close the gap.

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

Buy the Monoprice Monolith M-215 at Monoprice ($2999.99) →Buy the SVS PB17-Ultra R-Evolution at Amazon ($2,599.00) →

Specifications Side By Side

Monoprice Monolith M-215 SVS PB17-Ultra R-Evolution
Price$2999.99$2,599.00
Ranked#23 of 110 in Large Home Subwoofers (Over 75 lbs)#70 of 110 in Large Home Subwoofers (Over 75 lbs)
Enclosureported, frontported, bottom
Output SPL at 12.5 Hz103.9 dB90.7 dB
Output SPL at 15 Hz113.1 dB-
Output SPL at 20 Hz118.9 dB113.9 dB
Output SPL at 25 Hz122.6 dB117.5 dB
Output SPL at 31.5 Hz125.2 dB119.4 dB
Output SPL at 40 Hz126.4 dB120.1 dB
Output SPL at 50 Hz126.1 dB119.7 dB
Output SPL at 63 Hz125.6 dB119.0 dB
Output SPL at 80 Hz125.6 dB118.7 dB
Output SPL at 100 Hz125.7 dB119.8 dB
Output SPL at 125 Hz126.3 dB-
CEA-2010-A Average (40-80Hz)125.9 dB119.4 dB
Dimensions42.3”H x 20”W x 27.6”D (1074.4 x 508.0 x 701.0 mm)20”H x 19.5”W x 21.2”D (508.0 x 495.3 x 538.5 mm)
Weight216.1 lbs (98.0 kg)166.9 lbs (75.7 kg)
Warranty5-
Cabinet Colorblack-
CountryUnited StatesUnited States
Measurement SourceBrent ButterworthAudioholics
Drivers2x 15” (381mm) drivers17” driver, dual voice coil
Output SPL at 10 Hz-76.7 dB
Output SPL at 16 Hz-107.0 dB
Frequency Response-15-320Hz, ±3dB
Amplifier Power-2800W RMS
Inputs-XLR (balanced, LFE/stereo), RCA (LFE/stereo)
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 SVS PB17-Ultra R-Evolution at Amazon ($2,599.00) →

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

Prices on this page were last checked September 26, 2026 at 11:14 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 →

SVS PB17-Ultra R-Evolution: $2,599.00 Amazon eBay

SVS PB17-Ultra R-Evolution ranking card

Older models: the SVS PB16-Ultra (rated 4.2/5) and the SVS PB13-Ultra (rated 4.1/5).

Pros: Independent CEA-2010 testing (Standard Mode) records 113.9 dB at 20 Hz and 119.4 dB through 40-80 Hz. Triple 4” ports and a dual voice coil 17” driver deliver earth-shaking output with a +/-3dB window down to 12Hz in Extended Mode.

Cons: At 167 lbs with recessed feet that leave little clearance, moving or repositioning this cabinet is a two-person job at minimum.

Full SVS PB17-Ultra R-Evolution review and specifications →

AES InputNo
Amplifier Power2800W RMS
Aux InputNo
CEA-2010-A Average (40-80Hz)119.4 dB
Coaxial InputNo
CountryUnited States
Dimensions20”H x 19.5”W x 21.2”D (508.0 x 495.3 x 538.5 mm)
Drivers17” driver, dual voice coil
Enclosureported, bottom
Frequency Response15-320Hz, ±3dB
HDMI InputNo
InputsXLR (balanced, LFE/stereo), RCA (LFE/stereo)
Measurement SourceAudioholics
Optical InputNo
Output SPL at 10 Hz76.7 dB
Output SPL at 12.5 Hz90.7 dB
Output SPL at 16 Hz107.0 dB
Output SPL at 20 Hz113.9 dB
Output SPL at 25 Hz117.5 dB
Output SPL at 31.5 Hz119.4 dB
Output SPL at 40 Hz120.1 dB
Output SPL at 50 Hz119.7 dB
Output SPL at 63 Hz119.0 dB
Output SPL at 80 Hz118.7 dB
Output SPL at 100 Hz119.8 dB
RCA InputYes
TRS InputNo
USB InputNo
Weight166.9 lbs (75.7 kg)
XLR InputYes
Check current price at Amazon ($2,599.00) →Search eBay for SVS PB17-Ultra R-Evolution →