JBL 4645C Review: Rated 4.4/5

Last updated: October 21, 2026

The JBL 4645C is rated 4.4/5 for sound quality, #25 of 143 Large Home Subwoofers (Over 75 lbs). See all Subwoofers rankings for every top pick.

JBL 4645C · Editor's rating 4.4/5, ranked #25 of 143 Large Home Subwoofers (Over 75 lbs)

Prices on this page were last checked October 28, 2026 at 1:06 AM 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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Brand: JBL

#25 JBL 4645C: $4,999 Passive Discontinued eBay

Pros: A pro cinema 18 inch ported subwoofer with very strong upper bass punch, suited to adding impact in a modest room. 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. Discontinued.

Is the JBL 4645C right for you?

Skip it if

  • you need to move it often (63 kg each).
  • you want to buy it new: it is discontinued.
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)
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