Short answer: the Pro Audio Technology LFC-24sm for the higher ranking, the JBL 4645C for the lower price. The Pro Audio Technology LFC-24sm ranks #4 of 7 subwoofers at $10000. The JBL 4645C ranks #5 at $4999, $5001 cheaper.
Buy the JBL 4645C if the price matters more than the ranking. Buy the Pro Audio Technology LFC-24sm if the ranking matters more than the price.
Specifications Side By Side
| JBL 4645C | Pro Audio Technology LFC-24sm | |
|---|---|---|
| Price | $4999 | $10,000 |
| Ranked | #5 of 7 in Large Passive Home Subwoofers (Over 75 lbs) | #4 of 7 in Large Passive Home Subwoofers (Over 75 lbs) |
| Enclosure | ported, front | ported, front |
| Passive | Yes | Yes |
| Output SPL at 20 Hz | 98.9 dB | 117.7 dB |
| Output SPL at 25 Hz | 114.0 dB | 125.4 dB |
| Output SPL at 31.5 Hz | 118.7 dB | 127.6 dB |
| Output SPL at 40 Hz | 122.0 dB | 129.4 dB |
| Output SPL at 50 Hz | 123.7 dB | 130.0 dB |
| Output SPL at 63 Hz | 129.7 dB | 129.2 dB |
| Output SPL at 80 Hz | 133.9 dB | - |
| Output SPL at 100 Hz | 135.1 dB | - |
| Output SPL at 125 Hz | 135.8 dB | - |
| CEA-2010-A Average (40-80Hz) | 127.3 dB | 129.5 dB (avg of 3/4 bands) |
| Dimensions | 39.75"H x 26.5"W x 17.75"D (1009.6 x 673.1 x 450.8 mm) | 26.0"H x 60.5"W x 21.0"D (660.4 x 1536.7 x 533.4 mm) |
| Weight | 138 lbs / 62.6 kg | 266.1 lbs / 120.7 kg |
| Warranty | 5/3/2 | - |
| Cabinet Color | black | black |
| Country | United States | United States |
| Measurement Source | Data-bass | Brent Butterworth |
| Drivers | 18" (457mm) driver | 24" (610mm) driver |
The Two Speakers In Full
JBL 4645C: $4999
| CEA-2010-A Average (40-80Hz) | 127.3 dB |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 39.75"H x 26.5"W x 17.75"D (1009.6 x 673.1 x 450.8 mm) |
| Drivers | 18" (457mm) driver |
| Enclosure | ported, front |
| Measurement Source | Data-bass |
| Output SPL at 20 Hz | 98.9 dB |
| Output SPL at 25 Hz | 114.0 dB |
| Output SPL at 31.5 Hz | 118.7 dB |
| Output SPL at 40 Hz | 122.0 dB |
| Output SPL at 50 Hz | 123.7 dB |
| Output SPL at 63 Hz | 129.7 dB |
| Output SPL at 80 Hz | 133.9 dB |
| Output SPL at 100 Hz | 135.1 dB |
| Output SPL at 125 Hz | 135.8 dB |
| Passive | Yes |
| Warranty | 5/3/2 |
| Weight | 138 lbs / 62.6 kg |
- Head-to-Head Comparisons
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Pro Audio Technology LFC-24sm: $10,000
| CEA-2010-A Average (40-80Hz) | 129.5 dB (avg of 3/4 bands) |
|---|---|
| Cabinet Color | black |
| Country | United States |
| Dimensions | 26.0"H x 60.5"W x 21.0"D (660.4 x 1536.7 x 533.4 mm) |
| Drivers | 24" (610mm) driver |
| Enclosure | ported, front |
| Measurement Source | Brent Butterworth |
| Output SPL at 20 Hz | 117.7 dB |
| Output SPL at 25 Hz | 125.4 dB |
| Output SPL at 31.5 Hz | 127.6 dB |
| Output SPL at 40 Hz | 129.4 dB |
| Output SPL at 50 Hz | 130.0 dB |
| Output SPL at 63 Hz | 129.2 dB |
| Passive | Yes |
| Weight | 266.1 lbs / 120.7 kg |
- Head-to-Head Comparisons
- Links
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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.