Monoprice Monolith M-215 vs SVS PB-4000

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 SVS PB-4000 ranks #62, rated 4.2/5, at $2158.97, $841.02 cheaper, which does not close the gap in sound quality.

Monoprice Monolith M-215 vs SVS PB-4000

Buy the Monoprice Monolith M-215. It is rated higher for sound quality, and saving $841.02 with the SVS PB-4000 does not make up for the sound-quality gap.

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

Buy the Monoprice Monolith M-215 at Monoprice ($2999.99) →Buy the SVS PB-4000 at Amazon ($2,158.97) →

Specifications Side By Side

Monoprice Monolith M-215 SVS PB-4000
Price$2999.99$2,158.97
Ranked#23 of 110 in Large Home Subwoofers (Over 75 lbs)#62 of 110 in Large Home Subwoofers (Over 75 lbs)
Enclosureported, frontported, front
Output SPL at 12.5 Hz103.9 dB-
Output SPL at 15 Hz113.1 dB102.1 dB
Output SPL at 20 Hz118.9 dB115.3 dB
Output SPL at 25 Hz122.6 dB116.3 dB
Output SPL at 31.5 Hz125.2 dB117.8 dB
Output SPL at 40 Hz126.4 dB119.8 dB
Output SPL at 50 Hz126.1 dB121.7 dB
Output SPL at 63 Hz125.6 dB120.7 dB
Output SPL at 80 Hz125.6 dB119.2 dB
Output SPL at 100 Hz125.7 dB118.1 dB
Output SPL at 125 Hz126.3 dB117.5 dB
CEA-2010-A Average (40-80Hz)125.9 dB120.3 dB
Dimensions42.3"H x 20"W x 27.6"D (1074.4 x 508.0 x 701.0 mm)23.4"H x 20.5"W x 27.7"D (594.4 x 520.7 x 703.6 mm)
Weight216.1 lbs (98.0 kg)153.2 lbs (69.5 kg)
Warranty55
Cabinet Colorblackblack
CountryUnited StatesUnited States
Measurement SourceBrent ButterworthAudioholics
Drivers2x 15" (381mm) drivers13.5" (343mm) driver with ported design
Inputs-XLR (balanced), 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 PB-4000 at Amazon ($2,158.97) →

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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 →

SVS PB-4000: $2,158.97 Amazon eBay

SVS PB-4000 ranking card

Pros: Independent CEA-2010 testing records 115.3 dB at 20 Hz and 120.3 dB through 40-80 Hz. The ported, front enclosure with 13.5” (343mm) driver with ported design has the headroom for demanding film bass in a large room.

Cons: The 594.4H x 520.7W x 703.6D mm cabinet and 69.5 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.

Full SVS PB-4000 review and specifications →

AES InputNo
Aux InputNo
CEA-2010-A Average (40-80Hz)120.3 dB
Cabinet Colorblack
Coaxial InputNo
CountryUnited States
Dimensions23.4"H x 20.5"W x 27.7"D (594.4 x 520.7 x 703.6 mm)
Drivers13.5" (343mm) driver with ported design
Enclosureported, front
HDMI InputNo
InputsXLR (balanced), RCA (LFE/stereo)
Measurement SourceAudioholics
Optical InputNo
Output SPL at 15 Hz102.1 dB
Output SPL at 20 Hz115.3 dB
Output SPL at 25 Hz116.3 dB
Output SPL at 31.5 Hz117.8 dB
Output SPL at 40 Hz119.8 dB
Output SPL at 50 Hz121.7 dB
Output SPL at 63 Hz120.7 dB
Output SPL at 80 Hz119.2 dB
Output SPL at 100 Hz118.1 dB
Output SPL at 125 Hz117.5 dB
RCA InputYes
TRS InputNo
USB InputNo
Warranty5
Weight153.2 lbs (69.5 kg)
XLR InputYes
Check current price at Amazon ($2,158.97) →Search eBay for SVS PB-4000 →