Monoprice Monolith 16 THX Ultra vs Monoprice Monolith 13 THX Ultra

Last updated: September 14, 2026

Short answer: the Monoprice Monolith 16 THX Ultra on measured sound quality, the Monoprice Monolith 13 THX Ultra on price. The Monoprice Monolith 16 THX Ultra ranks #18 of 110 subwoofers at $2300. The Monoprice Monolith 13 THX Ultra ranks #56 at $1700, $600 cheaper.

Monoprice Monolith 16 THX Ultra vs Monoprice Monolith 13 THX Ultra

What the Monoprice Monolith 16 THX Ultra offers: 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. Watch for: Heavy at 78 kg and ported design can interact with room acoustics.

What the Monoprice Monolith 13 THX Ultra offers: Independent CEA-2010 testing records 115.0 dB at 20 Hz and 121.1 dB through 40-80 Hz. The ported, front enclosure with 13” (330mm) driver has the headroom for demanding film bass in a large room. Watch for: The 604.5H x 515.6W x 739.1D 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.

Buy the Monoprice Monolith 16 THX Ultra if sound quality is the priority over the price, or the Monoprice Monolith 13 THX Ultra if the price is the priority over sound quality.

Want more options? Browse the full Subwoofers rankings.

Specifications Side By Side

Monoprice Monolith 16 THX Ultra Monoprice Monolith 13 THX Ultra
Price$2,300$1,700
Ranked#18 of 110 in Large Home Subwoofers (Over 75 lbs)#56 of 110 in Large Home Subwoofers (Over 75 lbs)
Enclosureported, frontported, front
Output SPL at 15 Hz107.3 dB109.1 dB
Output SPL at 20 Hz118.4 dB115.0 dB
Output SPL at 25 Hz123.3 dB118.0 dB
Output SPL at 31.5 Hz125.1 dB119.5 dB
Output SPL at 40 Hz126.3 dB120.3 dB
Output SPL at 50 Hz126.5 dB120.7 dB
Output SPL at 63 Hz126.6 dB121.4 dB
Output SPL at 80 Hz126.8 dB122.1 dB
Output SPL at 100 Hz127.2 dB122.7 dB
Output SPL at 125 Hz127.6 dB123.8 dB
CEA-2010-A Average (40-80Hz)126.5 dB121.1 dB
Dimensions25.6"H x 22"W x 28.1"D (650.2 x 558.8 x 713.7 mm)23.8"H x 20.3"W x 29.1"D (604.5 x 515.6 x 739.1 mm)
Weight171.5 lbs (77.8 kg)153.2 lbs (69.5 kg)
Warranty55
Cabinet Colorblackblack
CountryUnited StatesUnited States
Measurement SourceAudioholicsAudioholics
Drivers16" (406mm) driver13" (330mm) driver
Output SPL at 12.5 Hz-94.0 dB

More top alternatives to Monoprice Monolith 16 THX Ultra:

Prices on this page were last checked September 14, 2026 at 1:47 AM 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 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.

Notes: Product # 42031

Full Monoprice Monolith 16 THX Ultra review and specifications →

CEA-2010-A Average (40-80Hz)126.5 dB
Cabinet Colorblack
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
Measurement SourceAudioholics
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
Warranty5
Weight171.5 lbs (77.8 kg)
Search eBay for Monoprice Monolith 16 THX Ultra →

Monoprice Monolith 13 THX Ultra: $1,700 eBay

Monoprice Monolith 13 THX Ultra ranking card

Pros: Independent CEA-2010 testing records 115.0 dB at 20 Hz and 121.1 dB through 40-80 Hz. The ported, front enclosure with 13” (330mm) driver has the headroom for demanding film bass in a large room.

Cons: The 604.5H x 515.6W x 739.1D 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.

Notes: Product # 41496

Full Monoprice Monolith 13 THX Ultra review and specifications →

CEA-2010-A Average (40-80Hz)121.1 dB
Cabinet Colorblack
CountryUnited States
Dimensions23.8"H x 20.3"W x 29.1"D (604.5 x 515.6 x 739.1 mm)
Drivers13" (330mm) driver
Enclosureported, front
Measurement SourceAudioholics
Output SPL at 12.5 Hz94.0 dB
Output SPL at 15 Hz109.1 dB
Output SPL at 20 Hz115.0 dB
Output SPL at 25 Hz118.0 dB
Output SPL at 31.5 Hz119.5 dB
Output SPL at 40 Hz120.3 dB
Output SPL at 50 Hz120.7 dB
Output SPL at 63 Hz121.4 dB
Output SPL at 80 Hz122.1 dB
Output SPL at 100 Hz122.7 dB
Output SPL at 125 Hz123.8 dB
Warranty5
Weight153.2 lbs (69.5 kg)
Search eBay for Monoprice Monolith 13 THX Ultra →