Funk Audio Ultra 24.0 vs JTR Speakers Captivator S2

Short answer: the Funk Audio Ultra 24.0, if you are buying new. The JTR Speakers Captivator S2 measures as well as it (#9 vs #11 of 139 subwoofers, 4.5/5 vs 4.5/5) but is discontinued, so only consider it used; the Funk Audio Ultra 24.0 is still sold new at $18,565.

Buy the Funk Audio Ultra 24.0, since the JTR Speakers Captivator S2 is discontinued and only worth hunting down used.

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

Specifications Side By Side

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Prices on this page were last checked October 7, 2026 at 9:25 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

Funk Audio Ultra 24.0: $18,565 Funk Audio eBay

Same family: the Funk Audio Ultra 21.0LX (smaller subwoofer, ranked lower, rated 4.4/5).

Pros: Published CEA-2010 specifications list 120.0 dB at 20 Hz and 127.9 dB through 40-80 Hz. The sealed enclosure with 24” (610mm) driver has the headroom for demanding film bass in a large room.

Cons: The 787.4H x 660.4W x 609.6D mm cabinet and 135 kg mass make this a serious placement and moving commitment. A sealed cabinet still needs careful placement and calibration to avoid room-mode peaks.

Full Funk Audio Ultra 24.0 review and specifications →

AES Input	No
Aux Input	No
CEA-2010-A Average (40-80Hz)	127.9 dB
Cabinet Color	wood, custom
Coaxial Input	No
Country	Canada
Dimensions	31”H x 26”W x 24”D (787.4 x 660.4 x 609.6 mm)
Drivers	24” (610mm) driver
Enclosure	sealed
HDMI Input	No
Inputs	XLR (balanced)
Measurement Source	Manufacturer
Optical Input	No
Output SPL at 10 Hz	101.0 dB
Output SPL at 12.5 Hz	104.9 dB
Output SPL at 15 Hz	111.8 dB
Output SPL at 20 Hz	120.0 dB
Output SPL at 25 Hz	122.0 dB
Output SPL at 31.5 Hz	123.0 dB
Output SPL at 40 Hz	127.1 dB
Output SPL at 50 Hz	129.9 dB
Output SPL at 63 Hz	127.6 dB
Output SPL at 80 Hz	127.0 dB
Output SPL at 100 Hz	128.2 dB
RCA Input	No
TRS Input	No
USB Input	No
Warranty	3
Weight	297.6 lbs (135 kg)
XLR Input	Yes

• Links
  • Funk Audio Ultra 24.0 Website
• Reviews, Comparisons and Sound Samples
  • These figures are manufacturer-specified rather than independently measured.
• Head-to-Head Comparisons
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JTR Speakers Captivator S2: $3,995 Discontinued 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. Discontinued.

Notes: Replaced by “RS2”

Full JTR Speakers Captivator S2 review and specifications →

AES Input	No
Aux Input	No
CEA-2010-A Average (40-80Hz)	129.4 dB
Coaxial Input	No
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
HDMI Input	No
Inputs	XLR (balanced), RCA
Measurement Source	Data-bass
Optical Input	No
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
RCA Input	Yes
TRS Input	No
USB Input	No
Warranty	5/3
Weight	220 lbs (99.8 kg)
XLR Input	Yes

• 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.
• Head-to-Head Comparisons
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