Short answer: the Harbottle Audio C24 L2, if you are buying new. The Monoprice Monolith 16 THX Ultra measures as well as it (#19 vs #18 of 143 subwoofers, 4.4/5 vs 4.4/5) but is discontinued, so only consider it used; the Harbottle Audio C24 L2 is still sold new at $10,078.84.
Buy the Harbottle Audio C24 L2 new; the Monoprice Monolith 16 THX Ultra is no longer sold new, so it only makes sense as a used find.
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Specifications Side By Side
| Harbottle Audio C24 L2 | Monoprice Monolith 16 THX Ultra | |
|---|---|---|
| Price | $10,078.84 | $2,300 Discontinued |
| Ranked | #18 of 143 in Large Home Subwoofers (Over 75 lbs) | #19 of 143 in Large 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 | 35.4”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) |
| 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 |
| 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 |
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