Harbottle Audio C24 L2 vs Monoprice Monolith 16 THX Ultra

Last updated: September 17, 2026

Short answer: the Harbottle Audio C24 L2 for better sound quality, the Monoprice Monolith 16 THX Ultra for the lower price. The Harbottle Audio C24 L2 ranks #17 of 110 subwoofers at $10078.84. The Monoprice Monolith 16 THX Ultra ranks #18 at $2300, $7778.84 cheaper.

Harbottle Audio C24 L2 vs Monoprice Monolith 16 THX Ultra

On the Monoprice Monolith 16 THX Ultra side: 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. The tradeoff: Heavy at 78 kg (172 lbs) and ported design can interact with room acoustics.

Buy the Harbottle Audio C24 L2 if sound quality matters more than the price. Buy the Monoprice Monolith 16 THX Ultra if the price matters more than sound quality.

Want more options? Browse the full Subwoofers rankings.

Specifications Side By Side

Harbottle Audio C24 L2 Monoprice Monolith 16 THX Ultra
Price$10,078.84$2,300
Ranked#17 of 110 in Large Home Subwoofers (Over 75 lbs)#18 of 110 in Large Home Subwoofers (Over 75 lbs)
Enclosureportedported, front
Output SPL at 10 Hz99.0 dB-
Output SPL at 12.5 Hz103.0 dB-
Output SPL at 15 Hz110.0 dB107.3 dB
Output SPL at 20 Hz117.0 dB118.4 dB
Output SPL at 25 Hz120.7 dB123.3 dB
Output SPL at 31.5 Hz124.0 dB125.1 dB
Output SPL at 40 Hz126.3 dB126.3 dB
Output SPL at 50 Hz127.3 dB126.5 dB
Output SPL at 63 Hz126.7 dB126.6 dB
Output SPL at 80 Hz126.0 dB126.8 dB
Output SPL at 100 Hz125.0 dB127.2 dB
CEA-2010-A Average (40-80Hz)126.6 dB126.5 dB
Dimensions35.4"H x 28.4"W x 20.2"D (899.9 x 722.1 x 512.1 mm)25.6"H x 22"W x 28.1"D (650.2 x 558.8 x 713.7 mm)
Weight149.9 lbs (68.0 kg)171.5 lbs (77.8 kg)
Cabinet Colorblack, white, red, blueblack
CountryCanadaUnited States
Measurement SourceManufacturerAudioholics
Drivers24" (610mm) driver16" (406mm) driver
Output SPL at 125 Hz-127.6 dB
Warranty-5
Inputs-XLR, RCA, XLR out
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

More worthwhile head-to-heads for Harbottle Audio C24 L2:

Prices on this page were last checked September 22, 2026 at 5:11 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

Harbottle Audio C24 L2: $10,078.84 eBay

Harbottle Audio C24 L2 ranking card

Pros: Published CEA-2010 specifications list 117.0 dB at 20 Hz and 126.6 dB through 40-80 Hz. The ported enclosure with 24” (610mm) driver has the headroom for demanding film bass in a large room.

Cons: The 899.9H x 722.1W x 512.1D mm cabinet and 68.0 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.

Full Harbottle Audio C24 L2 review and specifications →

CEA-2010-A Average (40-80Hz)126.6 dB
Cabinet Colorblack, white, red, blue
CountryCanada
Dimensions35.4"H x 28.4"W x 20.2"D (899.9 x 722.1 x 512.1 mm)
Drivers24" (610mm) driver
Enclosureported
Measurement SourceManufacturer
Output SPL at 10 Hz99.0 dB
Output SPL at 12.5 Hz103.0 dB
Output SPL at 15 Hz110.0 dB
Output SPL at 20 Hz117.0 dB
Output SPL at 25 Hz120.7 dB
Output SPL at 31.5 Hz124.0 dB
Output SPL at 40 Hz126.3 dB
Output SPL at 50 Hz127.3 dB
Output SPL at 63 Hz126.7 dB
Output SPL at 80 Hz126.0 dB
Output SPL at 100 Hz125.0 dB
Weight149.9 lbs (68.0 kg)
Search eBay for Harbottle Audio C24 L2 →

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 →

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 →