Monoprice Monolith 16 THX Ultra vs Funk Audio Classic 21.0L

Last updated: September 16, 2026

Short answer: the Monoprice Monolith 16 THX Ultra. It ranks #18 of 110 subwoofers by sound quality at $2300; the Funk Audio Classic 21.0L ranks #41 and costs $2995, which makes this an easy call rather than a real tradeoff.

Monoprice Monolith 16 THX Ultra vs Funk Audio Classic 21.0L

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 Funk Audio Classic 21.0L offers: Published CEA-2010 specifications list 114.0 dB at 20 Hz and 122.5 dB through 40-80 Hz. The sealed enclosure with 21” (533mm) driver has the headroom for demanding film bass in a large room. Watch for: The 800.1H x 660.4W x 609.6D mm cabinet and 70.3 kg mass make this a serious placement and moving commitment. A sealed cabinet still needs careful placement and calibration to avoid room-mode peaks.

Buy the Monoprice Monolith 16 THX Ultra. It ranks higher for sound quality than the Funk Audio Classic 21.0L and costs less, so there is no real case for the other one.

Looking for alternatives? See the complete Subwoofers rankings.

Specifications Side By Side

Monoprice Monolith 16 THX Ultra Funk Audio Classic 21.0L
Price$2,300$2995
Ranked#18 of 110 in Large Home Subwoofers (Over 75 lbs)#41 of 110 in Large Home Subwoofers (Over 75 lbs)
Enclosureported, frontsealed
Output SPL at 15 Hz107.3 dB108.0 dB
Output SPL at 20 Hz118.4 dB114.0 dB
Output SPL at 25 Hz123.3 dB118.5 dB
Output SPL at 31.5 Hz125.1 dB122.0 dB
Output SPL at 40 Hz126.3 dB122.4 dB
Output SPL at 50 Hz126.5 dB123.3 dB
Output SPL at 63 Hz126.6 dB122.5 dB
Output SPL at 80 Hz126.8 dB122.0 dB
Output SPL at 100 Hz127.2 dB122.5 dB
Output SPL at 125 Hz127.6 dB-
CEA-2010-A Average (40-80Hz)126.5 dB122.5 dB
Dimensions25.6"H x 22"W x 28.1"D (650.2 x 558.8 x 713.7 mm)31.5"H x 26"W x 24"D (800.1 x 660.4 x 609.6 mm)
Weight171.5 lbs (77.8 kg)155 lbs (70.3 kg)
Warranty53
Cabinet Colorblackwood, custom
CountryUnited StatesCanada
Measurement SourceAudioholicsManufacturer
Drivers16" (406mm) driver21" (533mm) driver
Output SPL at 10 Hz-99.0 dB
Output SPL at 12.5 Hz-102.0 dB

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

Prices on this page were last checked September 16, 2026 at 12:41 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 →

Funk Audio Classic 21.0L: $2995 eBay

Funk Audio Classic 21.0L ranking card

Pros: Published CEA-2010 specifications list 114.0 dB at 20 Hz and 122.5 dB through 40-80 Hz. The sealed enclosure with 21” (533mm) driver has the headroom for demanding film bass in a large room.

Cons: The 800.1H x 660.4W x 609.6D mm cabinet and 70.3 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 Funk Audio Classic 21.0L review and specifications →

CEA-2010-A Average (40-80Hz)122.5 dB
Cabinet Colorwood, custom
CountryCanada
Dimensions31.5"H x 26"W x 24"D (800.1 x 660.4 x 609.6 mm)
Drivers21" (533mm) driver
Enclosuresealed
Measurement SourceManufacturer
Output SPL at 10 Hz99.0 dB
Output SPL at 12.5 Hz102.0 dB
Output SPL at 15 Hz108.0 dB
Output SPL at 20 Hz114.0 dB
Output SPL at 25 Hz118.5 dB
Output SPL at 31.5 Hz122.0 dB
Output SPL at 40 Hz122.4 dB
Output SPL at 50 Hz123.3 dB
Output SPL at 63 Hz122.5 dB
Output SPL at 80 Hz122.0 dB
Output SPL at 100 Hz122.5 dB
Warranty3
Weight155 lbs (70.3 kg)
Search eBay for Funk Audio Classic 21.0L →