JTR Speakers Captivator S2 vs Harbottle Audio C24 L2

Short answer: the JTR Speakers Captivator S2. It ranks #9 of 110 subwoofers by sound quality at $3995; the Harbottle Audio C24 L2 ranks #17 and costs $10078.84, so there is not much of a tradeoff to weigh.

What the JTR Speakers Captivator S2 offers: Independent CEA-2010 testing records 115.1 dB at 20 Hz and 129.4 dB through 40-80 Hz. The sealed enclosure with 2x 18” (457mm) drivers has the headroom for demanding film bass in a large room. Watch for: The 1016.0H x 533.4W x 457.2D mm cabinet and 99.8 kg mass make this a serious placement and moving commitment. A sealed cabinet still needs careful placement and calibration to avoid room-mode peaks.

What the Harbottle Audio C24 L2 offers: Published CEA-2010 specifications list 117.0 dB at 20 Hz and 126.6 dB through 40-80 Hz. The ported enclosure with 24” (610mm) driver has the headroom for demanding film bass in a large room. Watch for: The 899.9H x 722.1W x 512.1D mm cabinet and 68.0 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.

Buy the JTR Speakers Captivator S2. It ranks higher for sound quality than the Harbottle Audio C24 L2 and costs less, which settles it without a real tradeoff to make.

Want more options? Browse the full Subwoofers rankings.

Specifications Side By Side

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Prices on this page were last checked September 16, 2026 at 12:41 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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The Two Speakers In Full

JTR Speakers Captivator S2: $3995 eBay

Pros: Independent CEA-2010 testing records 115.1 dB at 20 Hz and 129.4 dB through 40-80 Hz. The sealed enclosure with 2x 18” (457mm) drivers has the headroom for demanding film bass in a large room.

Cons: The 1016.0H x 533.4W x 457.2D mm cabinet and 99.8 kg mass make this a serious placement and moving commitment. A sealed cabinet still needs careful placement and calibration to avoid room-mode peaks.

Notes: Replaced by “RS2”

Full JTR Speakers Captivator S2 review and specifications →

CEA-2010-A Average (40-80Hz)	129.4 dB
Country	United States
Dimensions	40"H x 21"W x 18"D (1016.0 x 533.4 x 457.2 mm)
Drivers	2x 18" (457mm) drivers
Enclosure	sealed
Measurement Source	Data-bass
Output SPL at 10 Hz	100.3 dB
Output SPL at 12.5 Hz	103.3 dB
Output SPL at 15 Hz	108.7 dB
Output SPL at 20 Hz	115.1 dB
Output SPL at 25 Hz	119.7 dB
Output SPL at 31.5 Hz	124.8 dB
Output SPL at 40 Hz	129.3 dB
Output SPL at 50 Hz	130.3 dB
Output SPL at 63 Hz	129.4 dB
Output SPL at 80 Hz	128.5 dB
Output SPL at 100 Hz	128.1 dB
Output SPL at 125 Hz	128.0 dB
Warranty	5/3
Weight	220 lbs (99.8 kg)

• Links
  • JTR Speakers Captivator S2 Website
• Reviews, Comparisons and Sound Samples
  • Independently measured by Data-bass; the published figures above come from this ASR subwoofer measurement thread.
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Harbottle Audio C24 L2: $10,078.84 eBay

Pros: Published CEA-2010 specifications list 117.0 dB at 20 Hz and 126.6 dB through 40-80 Hz. The ported enclosure with 24” (610mm) driver has the headroom for demanding film bass in a large room.

Cons: The 899.9H x 722.1W x 512.1D mm cabinet and 68.0 kg mass make this a serious placement and moving commitment. Ported output does not solve room modes, so careful placement and calibration remain essential.

Full Harbottle Audio C24 L2 review and specifications →

CEA-2010-A Average (40-80Hz)	126.6 dB
Cabinet Color	black, white, red, blue
Country	Canada
Dimensions	35.4"H x 28.4"W x 20.2"D (899.9 x 722.1 x 512.1 mm)
Drivers	24" (610mm) driver
Enclosure	ported
Measurement Source	Manufacturer
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
Output SPL at 20 Hz	117.0 dB
Output SPL at 25 Hz	120.7 dB
Output SPL at 31.5 Hz	124.0 dB
Output SPL at 40 Hz	126.3 dB
Output SPL at 50 Hz	127.3 dB
Output SPL at 63 Hz	126.7 dB
Output SPL at 80 Hz	126.0 dB
Output SPL at 100 Hz	125.0 dB
Weight	149.9 lbs (68.0 kg)

• Links
  • Harbottle Audio C24 L2 Website
• Reviews, Comparisons and Sound Samples
  • These figures are manufacturer-specified rather than independently measured.
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