Monoprice Monolith 16 THX Ultra vs Monoprice Monolith 10 THX Select

Last updated: September 29, 2026

Short answer: the Monoprice Monolith 16 THX Ultra if sound quality matters most, the Monoprice Monolith 10 THX Select if price matters most. The Monoprice Monolith 16 THX Ultra ranks #18 of 109 subwoofers, rated 4.4/5, at $2,300. The Monoprice Monolith 10 THX Select ranks #90, rated 3.6/5, at $699, $1,601 cheaper.

Monoprice Monolith 16 THX Ultra vs Monoprice Monolith 10 THX Select

Why pick the Monoprice Monolith 16 THX Ultra: 16-inch ported driver and THX Ultra certification deliver 126.5dB CEA-2010-A average at a fraction of the price of the subwoofers ranked above it. The tradeoff: Heavy at 78 kg and ported design can interact with room acoustics.

What the Monoprice Monolith 10 THX Select does well: THX-certified 10-inch ported with 500W amp extends down to 20Hz with no internal resonance or port noise.

One note: the Monoprice Monolith 16 THX Ultra is discontinued, but it still ranks #18 of 109 subwoofers by sound quality, ahead of most of what is still sold new, so it is worth considering used.

Buy the Monoprice Monolith 16 THX Ultra if sound quality matters more than the price. Buy the Monoprice Monolith 10 THX Select if the price matters more than sound quality.

Looking for alternatives? See the complete Subwoofers rankings.

Specifications Side By Side

Monoprice Monolith 16 THX Ultra Monoprice Monolith 10 THX Select
Price$2,300 Discontinued$699 Discontinued
Ranked#18 of 109 in Large Home Subwoofers (Over 75 lbs)#90 of 145 in Medium Home Subwoofers (30-75 lbs)
Enclosureported, frontported, front
Output SPL at 15 Hz107.3 dB95.4 dB
Output SPL at 20 Hz118.4 dB102.6 dB
Output SPL at 25 Hz123.3 dB107.7 dB
Output SPL at 31.5 Hz125.1 dB109.0 dB
Output SPL at 40 Hz126.3 dB110.0 dB
Output SPL at 50 Hz126.5 dB112.0 dB
Output SPL at 63 Hz126.6 dB112.0 dB
Output SPL at 80 Hz126.8 dB112.0 dB
Output SPL at 100 Hz127.2 dB112.0 dB
Output SPL at 125 Hz127.6 dB111.0 dB
CEA-2010-A Average (40-80Hz)126.5 dB111.5 dB
Dimensions25.6”H x 22”W x 28.1”D (650.2 x 558.8 x 713.7 mm)18.9”H x 15”W x 19.7”D (480.1 x 381.0 x 500.4 mm)
Weight171.5 lbs (77.8 kg)72.5 lbs (32.9 kg)
Warranty55
Cabinet Colorblackblack
CountryUnited StatesUnited States
Measurement SourceAudioholicsErinsAudioCorner
Drivers16” (406mm) driver10” (254mm) driver
InputsXLR, RCA, XLR outXLR, RCA, XLR passthrough out
XLR InputYesYes
RCA InputYesYes
TRS InputNoNo
Optical InputNoNo
Coaxial InputNoNo
USB InputNoNo
HDMI InputNoNo
AES InputNoNo
Aux InputNoNo
Amplifier Power-500W RMS
Frequency Response-17-20Hz

How Monoprice Monolith 16 THX Ultra compares with other leading options:

Prices on this page were last checked September 29, 2026 at 3:43 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 16 THX Ultra: $2,300 Discontinued eBay

Monoprice Monolith 16 THX Ultra ranking card

Pros: 16-inch ported driver and THX Ultra certification deliver 126.5dB CEA-2010-A average at a fraction of the price of the subwoofers ranked above it.

Cons: Heavy at 78 kg and ported design can interact with room acoustics. Discontinued.

Notes: Product # 42031

Full Monoprice Monolith 16 THX Ultra review and specifications →

AES InputNo
Aux InputNo
CEA-2010-A Average (40-80Hz)126.5 dB
Cabinet Colorblack
Coaxial InputNo
CountryUnited States
Dimensions25.6”H x 22”W x 28.1”D (650.2 x 558.8 x 713.7 mm)
Drivers16” (406mm) driver
Enclosureported, front
HDMI InputNo
InputsXLR, RCA, XLR out
Measurement SourceAudioholics
Optical InputNo
Output SPL at 15 Hz107.3 dB
Output SPL at 20 Hz118.4 dB
Output SPL at 25 Hz123.3 dB
Output SPL at 31.5 Hz125.1 dB
Output SPL at 40 Hz126.3 dB
Output SPL at 50 Hz126.5 dB
Output SPL at 63 Hz126.6 dB
Output SPL at 80 Hz126.8 dB
Output SPL at 100 Hz127.2 dB
Output SPL at 125 Hz127.6 dB
RCA InputYes
TRS InputNo
USB InputNo
Warranty5
Weight171.5 lbs (77.8 kg)
XLR InputYes
Search eBay for Monoprice Monolith 16 THX Ultra →

Monoprice Monolith 10 THX Select: $699 Discontinued eBay

Monoprice Monolith 10 THX Select ranking card

Newer model: the Monoprice Monolith M-10 V2, ranked lower, rated 3.4/5.

Pros: THX-certified 10-inch ported with 500W amp extends down to 20Hz with no internal resonance or port noise. HDF cabinet construction ensures inert enclosure. Variable phase adjustment and robust built-to-last design.

Cons: Discontinued.

Notes: Product # 24456

Full Monoprice Monolith 10 THX Select review and specifications →

AES InputNo
Amplifier Power500W RMS
Aux InputNo
CEA-2010-A Average (40-80Hz)111.5 dB
Cabinet Colorblack
Coaxial InputNo
CountryUnited States
Dimensions18.9”H x 15”W x 19.7”D (480.1 x 381.0 x 500.4 mm)
Drivers10” (254mm) driver
Enclosureported, front
Frequency Response17-20Hz
HDMI InputNo
InputsXLR, RCA, XLR passthrough out
Measurement SourceErinsAudioCorner
Optical InputNo
Output SPL at 15 Hz95.4 dB
Output SPL at 20 Hz102.6 dB
Output SPL at 25 Hz107.7 dB
Output SPL at 31.5 Hz109.0 dB
Output SPL at 40 Hz110.0 dB
Output SPL at 50 Hz112.0 dB
Output SPL at 63 Hz112.0 dB
Output SPL at 80 Hz112.0 dB
Output SPL at 100 Hz112.0 dB
Output SPL at 125 Hz111.0 dB
RCA InputYes
TRS InputNo
USB InputNo
Warranty5
Weight72.5 lbs (32.9 kg)
XLR InputYes
Search eBay for Monoprice Monolith 10 THX Select →