JTR Speakers Captivator S2 vs Rythmik F18

Short answer: the JTR Speakers Captivator S2. It ranks #9 of 110 subwoofers by sound quality, rated 4.5/5, at $3995. The Rythmik F18 ranks #69, rated 4.1/5, at $2344, $1651 cheaper, not enough of a saving to outweigh the sound-quality gap.

Buy the JTR Speakers Captivator S2. It is rated higher for sound quality, and the $1651 you would save on the Rythmik F18 does not close the gap.

Want more options? Browse the full Subwoofers rankings.

Specifications Side By Side

Related Speaker Comparisons

How JTR Speakers Captivator S2 compares with other leading options:

• JTR Speakers Captivator S2 vs JTR Speakers Orbit Shifter PRO
• JTR Speakers Captivator S2 vs JTR Speakers Orbit Shifter LFU
• JTR Speakers Captivator S2 vs WW Speaker Cabinets X21 - B&C 21DS115-4
• JTR Speakers Captivator S2 vs Pro Audio Technology LFC-24sm
• JTR Speakers Captivator S2 vs Power Sound Audio (PSA) TRIAX

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.

As an eBay Partner, we may be compensated if you make a purchase.

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 →

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
  • 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 Funk Audio Custom 21.0
  • JTR Speakers Captivator S2 vs Power Sound Audio (PSA) TRIAX
  • JTR Speakers Captivator S2 vs JTR Speakers Growler (2015)
  • See all 48 comparisons

Rythmik F18: $1,850 Rythmik Audio eBay

Pros: Independent CEA-2010 testing records 106.2 dB at 20 Hz and 119.5 dB through 40-80 Hz. The sealed enclosure with 18” (457mm) driver has the headroom for demanding film bass in a large room.

Cons: The 520.7H x 520.7W x 533.4D mm cabinet and 52.2 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 Rythmik F18 review and specifications →

AES Input	No
Aux Input	No
CEA-2010-A Average (40-80Hz)	119.5 dB
Cabinet Color	black
Coaxial Input	No
Country	United States
Dimensions	20.5"H x 20.5"W x 21"D (520.7 x 520.7 x 533.4 mm)
Drivers	18" (457mm) driver
Enclosure	sealed
HDMI Input	No
Inputs	XLR (2), RCA (line/LFE)
Measurement Source	Data-bass
Optical Input	No
Output SPL at 10 Hz	93.7 dB
Output SPL at 12.5 Hz	97.4 dB
Output SPL at 15 Hz	102.0 dB
Output SPL at 20 Hz	106.2 dB
Output SPL at 25 Hz	110.9 dB
Output SPL at 31.5 Hz	114.3 dB
Output SPL at 40 Hz	117.1 dB
Output SPL at 50 Hz	119.1 dB
Output SPL at 63 Hz	120.5 dB
Output SPL at 80 Hz	121.2 dB
Output SPL at 100 Hz	121.4 dB
Output SPL at 125 Hz	121.4 dB
RCA Input	Yes
TRS Input	No
USB Input	No
Warranty	5/3
Weight	115.1 lbs (52.2 kg)
XLR Input	Yes

• Links
  • Rythmik F18 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
  • Rythmik F18 vs Perlisten Audio R212s
  • Rythmik F18 vs Monoprice Monolith M15-S
  • Rythmik F18 vs Monoprice Monolith M-15 V2
  • Rythmik F18 vs SVS PB-4000
  • Rythmik F18 vs HSU Research VTF-3 MK5 HP
  • Rythmik F18 vs HSU Research VTF-15H MK2
  • Rythmik F18 vs Rythmik FV15HP
  • Rythmik F18 vs HSU Research VTF-3 MK3
  • See all 24 comparisons