JTR Speakers Captivator S2 vs Funk Audio Custom 21.0

Short answer: the JTR Speakers Captivator S2. It ranks #9 of 110 subwoofers by sound quality at $3995; the Funk Audio Custom 21.0 ranks #12 and costs $6061.91, 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 Funk Audio Custom 21.0 offers: Independent CEA-2010 testing records 109.8 dB at 20 Hz and 127.7 dB through 40-80 Hz. The sealed enclosure with 21” (533mm) driver has the headroom for demanding film bass in a large room. Watch for: The 577.9H x 565.1W x 520.7D mm cabinet and 65.8 kg mass make this a serious placement and moving commitment. A sealed cabinet still needs careful placement and calibration to avoid room-mode peaks.

Buy the JTR Speakers Captivator S2. It ranks higher for sound quality than the Funk Audio Custom 21.0 and costs less, so there is no real case for the other one.

Looking for alternatives? See the complete 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.
• Head-to-Head Comparisons
  • JTR Speakers Captivator S2 vs Power Sound Audio (PSA) T18
  • JTR Speakers Captivator S2 vs Power Sound Audio (PSA) V3600I
  • JTR Speakers Captivator S2 vs Funk Audio Ultra 24.0
  • JTR Speakers Captivator S2 vs JTR Speakers Captivator 215PRO
  • JTR Speakers Captivator S2 vs JTR Speakers Captivator 4000ULF
  • JTR Speakers Captivator S2 vs Power Sound Audio (PSA) TRIAX
  • JTR Speakers Captivator S2 vs JTR Speakers Growler (2015)
  • JTR Speakers Captivator S2 vs Pro Audio Technology LFC-24sm
  • See all 48 comparisons

Funk Audio Custom 21.0: $6,061.91 eBay

Pros: Independent CEA-2010 testing records 109.8 dB at 20 Hz and 127.7 dB through 40-80 Hz. The sealed enclosure with 21” (533mm) driver has the headroom for demanding film bass in a large room.

Cons: The 577.9H x 565.1W x 520.7D mm cabinet and 65.8 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: Data-bass labeled this sub as ‘FW21.0’, but original name is 21.0

Full Funk Audio Custom 21.0 review and specifications →

CEA-2010-A Average (40-80Hz)	127.7 dB
Cabinet Color	wood, custom
Country	Canada
Dimensions	22.8"H x 22.2"W x 20.5"D (577.9 x 565.1 x 520.7 mm)
Drivers	21" (533mm) driver
Enclosure	sealed
Measurement Source	Data-bass
Output SPL at 10 Hz	97.4 dB
Output SPL at 12.5 Hz	101.1 dB
Output SPL at 15 Hz	105.7 dB
Output SPL at 20 Hz	109.8 dB
Output SPL at 25 Hz	114.2 dB
Output SPL at 31.5 Hz	120.4 dB
Output SPL at 40 Hz	124.1 dB
Output SPL at 50 Hz	126.8 dB
Output SPL at 63 Hz	129.0 dB
Output SPL at 80 Hz	131.0 dB
Output SPL at 100 Hz	132.6 dB
Output SPL at 125 Hz	133.0 dB
Warranty	3
Weight	145.1 lbs (65.8 kg)

• Links
  • Funk Audio Custom 21.0 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
  • Funk Audio Custom 21.0 vs Funk Audio Ultra 24.0
  • Funk Audio Custom 21.0 vs Power Sound Audio (PSA) V3600I
  • Funk Audio Custom 21.0 vs Funk Audio Classic 18.0
  • Funk Audio Custom 21.0 vs Harbottle Audio C24 L2
  • Funk Audio Custom 21.0 vs Monoprice Monolith 16 THX Ultra
  • Funk Audio Custom 21.0 vs HSU Research VTF-3 MK5 HP