JBL 4645C vs Pro Audio Technology LFC-24sm

Last updated: October 21, 2026

Short answer: the Pro Audio Technology LFC-24sm. It ranks #4 of 143 subwoofers by sound quality (rated 4.6/5) at $10,000 and is still sold new; the JBL 4645C ranks #25 (rated 4.4/5) and is discontinued, so it is only an option used.

JBL 4645C vs Pro Audio Technology LFC-24sm

Buy the Pro Audio Technology LFC-24sm. It is rated higher for sound quality, and the JBL 4645C is discontinued, so it is only available used.

Still deciding? The full Subwoofers rankings cover every ranked option.

Prices on this page were last checked November 7, 2026 at 7:34 PM 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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Specifications Side By Side

JBL 4645C Pro Audio Technology LFC-24sm
Price$4,999 Passive, Discontinued$10,000 Passive
Ranked#25 of 143 in Large Home Subwoofers (Over 75 lbs)#4 of 143 in Large Home Subwoofers (Over 75 lbs)
Enclosureported, frontported, front
PassiveYesYes
Output SPL at 20 Hz98.9 dB123.7 dB
Output SPL at 25 Hz114.0 dB131.4 dB
Output SPL at 31.5 Hz118.7 dB133.6 dB
Output SPL at 40 Hz122.0 dB135.4 dB
Output SPL at 50 Hz123.7 dB136.0 dB
Output SPL at 63 Hz129.7 dB135.2 dB
Output SPL at 80 Hz133.9 dB-
Output SPL at 100 Hz135.1 dB-
Output SPL at 125 Hz135.8 dB-
CEA-2010-A Average (40-80Hz)127.3 dB135.5 dB (avg of 3/4 bands)
Dimensions39.7”H x 26.5”W x 17.7”D (1009.6 x 673.1 x 450.8 mm)26”H x 60.5”W x 21”D (660.4 x 1536.7 x 533.4 mm)
Weight138 lbs (62.6 kg)266.1 lbs (120.7 kg)
Warranty5/3/2-
Cabinet Colorblackblack
CountryUnited StatesUnited States
Measurement SourceData-bassBrent Butterworth
Drivers18” (457mm) driver24” (610mm) driver

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