JBL 4645C vs Pro Audio Technology LFC-24sm

Last updated: September 16, 2026

Short answer: the Pro Audio Technology LFC-24sm if sound quality matters most, the JBL 4645C if price matters most. The Pro Audio Technology LFC-24sm ranks #4 of 110 subwoofers, rated 4.6/5, at $10000. The JBL 4645C ranks #24, rated 4.4/5, at $4999, $5001 cheaper.

JBL 4645C vs Pro Audio Technology LFC-24sm

Buy the JBL 4645C if the price matters more than sound quality. Buy the Pro Audio Technology LFC-24sm if sound quality matters more than the price.

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

Specifications Side By Side

JBL 4645C Pro Audio Technology LFC-24sm
Price$4999 Passive$10,000 Passive
Ranked#24 of 110 in Large Home Subwoofers (Over 75 lbs)#4 of 110 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

More worthwhile head-to-heads for Pro Audio Technology LFC-24sm:

Prices on this page were last checked September 23, 2026 at 11:24 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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The Two Speakers In Full

JBL 4645C: $4999 Passive eBay

JBL 4645C ranking card

Pros: Independent CEA-2010 testing records 98.9 dB at 20 Hz and 127.3 dB through 40-80 Hz. The ported, front enclosure with 18” (457mm) driver is best suited to upper-bass support in a modest room.

Cons: Deep-bass output is limited relative to its midbass result, so it is not the right choice for the lowest movie effects. The 1009.6H x 673.1W x 450.8D mm cabinet and 62.6 kg mass still need deliberate placement and calibration.

Full JBL 4645C review and specifications →

CEA-2010-A Average (40-80Hz)127.3 dB
Cabinet Colorblack
CountryUnited States
Dimensions39.7"H x 26.5"W x 17.7"D (1009.6 x 673.1 x 450.8 mm)
Drivers18" (457mm) driver
Enclosureported, front
Measurement SourceData-bass
Output SPL at 20 Hz98.9 dB
Output SPL at 25 Hz114.0 dB
Output SPL at 31.5 Hz118.7 dB
Output SPL at 40 Hz122.0 dB
Output SPL at 50 Hz123.7 dB
Output SPL at 63 Hz129.7 dB
Output SPL at 80 Hz133.9 dB
Output SPL at 100 Hz135.1 dB
Output SPL at 125 Hz135.8 dB
PassiveYes
Warranty5/3/2
Weight138 lbs (62.6 kg)
Search eBay for JBL 4645C →

Pro Audio Technology LFC-24sm: $10,000 Passive eBay

Pro Audio Technology LFC-24sm ranking card

Pros: Independent CEA-2010 testing records 123.7 dB at 20 Hz and 135.5 dB (avg of 3/4 bands) through 40-80 Hz. The ported, front enclosure with 24” (610mm) driver is best suited to demanding film bass in a large room.

Cons: The 660.4H x 1536.7W x 533.4D mm cabinet and 120.7 kg mass still need deliberate placement and calibration.

Full Pro Audio Technology LFC-24sm review and specifications →

CEA-2010-A Average (40-80Hz)135.5 dB (avg of 3/4 bands)
Cabinet Colorblack
CountryUnited States
Dimensions26"H x 60.5"W x 21"D (660.4 x 1536.7 x 533.4 mm)
Drivers24" (610mm) driver
Enclosureported, front
Measurement SourceBrent Butterworth
Output SPL at 20 Hz123.7 dB
Output SPL at 25 Hz131.4 dB
Output SPL at 31.5 Hz133.6 dB
Output SPL at 40 Hz135.4 dB
Output SPL at 50 Hz136.0 dB
Output SPL at 63 Hz135.2 dB
PassiveYes
Weight266.1 lbs (120.7 kg)
Search eBay for Pro Audio Technology LFC-24sm →