Monoprice Monolith M-15 V2 vs Power Sound Audio (PSA) TRIAX

Last updated: September 17, 2026

Short answer: the Power Sound Audio (PSA) TRIAX if sound quality matters most, the Monoprice Monolith M-15 V2 if price matters most. The Power Sound Audio (PSA) TRIAX ranks #5 of 110 subwoofers, rated 4.5/5, at $7995. The Monoprice Monolith M-15 V2 ranks #64, rated 4.2/5, at $1500, $6495 cheaper.

Monoprice Monolith M-15 V2 vs Power Sound Audio (PSA) TRIAX

Buy the Monoprice Monolith M-15 V2 when the price outweighs sound quality for you, and the Power Sound Audio (PSA) TRIAX when sound quality outweighs the price instead.

Want more options? Browse the full Subwoofers rankings.

Specifications Side By Side

Monoprice Monolith M-15 V2 Power Sound Audio (PSA) TRIAX
Price$1,500 Discontinued$7995
Ranked#64 of 110 in Large Home Subwoofers (Over 75 lbs)#5 of 110 in Large Home Subwoofers (Over 75 lbs)
Enclosureported, frontsealed
Output SPL at 12.5 Hz91.0 dB-
Output SPL at 15 Hz106.3 dB-
Output SPL at 20 Hz112.6 dB119.8 dB
Output SPL at 25 Hz116.6 dB119.8 dB
Output SPL at 31.5 Hz119.5 dB119.8 dB
Output SPL at 40 Hz120.9 dB130.9 dB
Output SPL at 50 Hz120.6 dB130.9 dB
Output SPL at 63 Hz120.0 dB130.9 dB
Output SPL at 80 Hz118.7 dB-
Output SPL at 100 Hz120.1 dB-
Output SPL at 125 Hz120.2 dB-
CEA-2010-A Average (40-80Hz)120.0 dB130.9 dB (avg of 3/4 bands)
Dimensions28.7"H x 17.7"W x 26.8"D (729.0 x 449.6 x 680.7 mm)23.5"H x 31"W x 27.5"D (596.9 x 787.4 x 698.5 mm)
Weight132.9 lbs (60.3 kg)229.9 lbs (104.3 kg)
Warranty55
Cabinet Colorblack-
CountryUnited StatesUnited States
Measurement SourceManufacturerManufacturer
Drivers15" (381mm) driver3x 15" (381mm) driver
DiscontinuedYes-
InputsXLR, RCAXLR (balanced, with loop output)
XLR InputYesYes
RCA InputYesNo
TRS InputNoNo
Optical InputNoNo
Coaxial InputNoNo
USB InputNoNo
HDMI InputNoNo
AES InputNoNo
Aux InputNoNo

How Power Sound Audio (PSA) TRIAX compares with other leading options:

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-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 →

Power Sound Audio (PSA) TRIAX: $7995 eBay

Power Sound Audio (PSA) TRIAX ranking card

Pros: Published CEA-2010 specifications list 119.8 dB at 20 Hz and 130.9 dB (avg of 3/4 bands) through 40-80 Hz. The sealed enclosure with 3x 15” (381mm) driver has the headroom for demanding film bass in a large room.

Cons: The 596.9H x 787.4W x 698.5D mm cabinet and 104.3 kg mass make this a serious placement and moving commitment. A sealed cabinet still needs careful placement and calibration to avoid room-mode peaks.

Full Power Sound Audio (PSA) TRIAX review and specifications →

AES InputNo
Aux InputNo
CEA-2010-A Average (40-80Hz)130.9 dB (avg of 3/4 bands)
Coaxial InputNo
CountryUnited States
Dimensions23.5"H x 31"W x 27.5"D (596.9 x 787.4 x 698.5 mm)
Drivers3x 15" (381mm) driver
Enclosuresealed
HDMI InputNo
InputsXLR (balanced, with loop output)
Measurement SourceManufacturer
Optical InputNo
Output SPL at 20 Hz119.8 dB
Output SPL at 25 Hz119.8 dB
Output SPL at 31.5 Hz119.8 dB
Output SPL at 40 Hz130.9 dB
Output SPL at 50 Hz130.9 dB
Output SPL at 63 Hz130.9 dB
RCA InputNo
TRS InputNo
USB InputNo
Warranty5
Weight229.9 lbs (104.3 kg)
XLR InputYes
Search eBay for Power Sound Audio (PSA) TRIAX →