Short answer: the Harbottle Audio C24 L2 for the higher ranking, the Monoprice Monolith 16 THX Ultra for the lower price. The Harbottle Audio C24 L2 ranks #12 of 97 subwoofers at $10078.84. The Monoprice Monolith 16 THX Ultra ranks #13 at $2300, $7778.84 cheaper.
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 and ported design can interact with room acoustics.
Buy the Harbottle Audio C24 L2 if the ranking matters more than the price. Buy the Monoprice Monolith 16 THX Ultra if the price matters more than the ranking.
Specifications Side By Side
| Harbottle Audio C24 L2 | Monoprice Monolith 16 THX Ultra | |
|---|---|---|
| Price | $10,078.84 | $2,300 |
| Ranked | #12 of 97 in Large Powered Home Subwoofers (Over 75 lbs) | #13 of 97 in Large Powered Home Subwoofers (Over 75 lbs) |
| Enclosure | ported | ported, front |
| Output SPL at 10 Hz | 99.0 dB | - |
| Output SPL at 12.5 Hz | 103.0 dB | - |
| Output SPL at 15 Hz | 110.0 dB | 107.3 dB |
| Output SPL at 20 Hz | 117.0 dB | 118.4 dB |
| Output SPL at 25 Hz | 120.7 dB | 123.3 dB |
| Output SPL at 31.5 Hz | 124.0 dB | 125.1 dB |
| Output SPL at 40 Hz | 126.3 dB | 126.3 dB |
| Output SPL at 50 Hz | 127.3 dB | 126.5 dB |
| Output SPL at 63 Hz | 126.7 dB | 126.6 dB |
| Output SPL at 80 Hz | 126.0 dB | 126.8 dB |
| Output SPL at 100 Hz | 125.0 dB | 127.2 dB |
| CEA-2010-A Average (40-80Hz) | 126.6 dB | 126.5 dB |
| Dimensions | 35.43"H x 28.43"W x 20.16"D (899.9 x 722.1 x 512.1 mm) | 25.6"H x 22.0"W x 28.1"D (650.2 x 558.8 x 713.7 mm) |
| Weight | 149.9 lbs / 68.0 kg | 171.5 lbs / 77.8 kg |
| Cabinet Color | black, white, red, blue | black |
| Country | Canada | United States |
| Measurement Source | Manufacturer | Audioholics |
| Drivers | 24" (610mm) driver | 16" (406mm) driver |
| Output SPL at 125 Hz | - | 127.6 dB |
| Warranty | - | 5 |
The Two Speakers In Full
Harbottle Audio C24 L2: $10,078.84
| CEA-2010-A Average (40-80Hz) | 126.6 dB |
|---|---|
| Cabinet Color | black, white, red, blue |
| Country | Canada |
| Dimensions | 35.43"H x 28.43"W x 20.16"D (899.9 x 722.1 x 512.1 mm) |
| Drivers | 24" (610mm) driver |
| Enclosure | ported |
| Measurement Source | Manufacturer |
| Output SPL at 10 Hz | 99.0 dB |
| Output SPL at 12.5 Hz | 103.0 dB |
| Output SPL at 15 Hz | 110.0 dB |
| Output SPL at 20 Hz | 117.0 dB |
| Output SPL at 25 Hz | 120.7 dB |
| Output SPL at 31.5 Hz | 124.0 dB |
| Output SPL at 40 Hz | 126.3 dB |
| Output SPL at 50 Hz | 127.3 dB |
| Output SPL at 63 Hz | 126.7 dB |
| Output SPL at 80 Hz | 126.0 dB |
| Output SPL at 100 Hz | 125.0 dB |
| Weight | 149.9 lbs / 68.0 kg |
- Head-to-Head Comparisons
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Monoprice Monolith 16 THX Ultra: $2,300
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
| CEA-2010-A Average (40-80Hz) | 126.5 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 25.6"H x 22.0"W x 28.1"D (650.2 x 558.8 x 713.7 mm) |
| Drivers | 16" (406mm) driver |
| Enclosure | ported, front |
| Measurement Source | Audioholics |
| Output SPL at 15 Hz | 107.3 dB |
| Output SPL at 20 Hz | 118.4 dB |
| Output SPL at 25 Hz | 123.3 dB |
| Output SPL at 31.5 Hz | 125.1 dB |
| Output SPL at 40 Hz | 126.3 dB |
| Output SPL at 50 Hz | 126.5 dB |
| Output SPL at 63 Hz | 126.6 dB |
| Output SPL at 80 Hz | 126.8 dB |
| Output SPL at 100 Hz | 127.2 dB |
| Output SPL at 125 Hz | 127.6 dB |
| Warranty | 5 |
| Weight | 171.5 lbs / 77.8 kg |
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Product prices and availability were last checked August 9, 2026 at 6:57 AM UTC 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.