JTR Kallos 12Sub vs JTR Speakers Captivator RS1

Short answer: the JTR Speakers Captivator RS1 has been measured and ranked; the JTR Kallos 12Sub has not been measured in a way we can rank yet, so until it is, this comes down to features and price.

What the JTR Kallos 12Sub offers: A compact sealed subwoofer with a 12-inch driver and a 2,000W RMS Class D amplifier, with DSP tuning for a smooth response and high output.

On the JTR Speakers Captivator RS1 side: Independent CEA-2010 testing records 111.1 dB at 20 Hz and 121.8 dB through 40-80 Hz.

Price: the JTR Kallos 12Sub lists at $3,699 and the JTR Speakers Captivator RS1 at $3,300.

Buy the JTR Speakers Captivator RS1 if you want a speaker whose sound quality has been measured and ranked.

Buy the JTR Kallos 12Sub if you prefer its design or features, and you can wait for measurements to confirm how it sounds.

Want more options? Browse the full Subwoofers rankings.

Specifications Side By Side

Prices on this page were last checked September 30, 2026 at 2:57 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

JTR Kallos 12Sub: $3,699 JTR Speakers eBay

Pros: A compact sealed subwoofer with a 12-inch driver and a 2,000W RMS Class D amplifier, with DSP tuning for a smooth response and high output. JTR rates it at 22Hz to 800Hz within 3dB outdoors, with in-room gain extending it lower. The cabinet is stacked Baltic birch, about 48cm square and 32cm deep.

Cons: Erin’s Audio Corner tested it outdoors on video, but CEA-2010 output figures in the form the other subwoofers here are ranked on haven’t been published, so it can’t be placed against them. At $3,699 it is expensive for a single 12-inch subwoofer, and it is sold mainly direct from JTR.

Full JTR Kallos 12Sub review and specifications →

Amplifier Power	2000W RMS (Class D)
Cabinet Material	Stacked Baltic birch
Country	United States
Dimensions	18.7”H x 18.7”W x 12.8”D (476 x 476 x 324 mm)
Drivers	12” (305mm) driver
Enclosure	sealed
Frequency Response	22Hz - 800Hz (+/-3dB outdoor) (Manufacturer specified)

• Links
  • Official JTR Kallos 12Sub Website
• Reviews, Comparisons and Sound Samples
  • Erin’s Audio Corner: Testing this Subwoofer Got Me In Trouble!
• Head-to-Head Comparisons
  • JTR Kallos 12Sub vs SVS SB16-Ultra

JTR Speakers Captivator RS1: $3,300 JTR Speakers eBay

Pros: Independent CEA-2010 testing records 111.1 dB at 20 Hz and 121.8 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 533.4H x 533.4W x 457.2D mm cabinet and 53.1 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 JTR Speakers Captivator RS1 review and specifications →

AES Input	No
Aux Input	No
CEA-2010-A Average (40-80Hz)	121.8 dB
Cabinet Color	black
Coaxial Input	No
Country	United States
Dimensions	21”H x 21”W x 18”D (533.4 x 533.4 x 457.2 mm)
Drivers	18” (457mm) driver
Enclosure	sealed
HDMI Input	No
Inputs	XLR, RCA
Measurement Source	Audioholics
Optical Input	No
Output SPL at 10 Hz	96.1 dB
Output SPL at 12.5 Hz	100.1 dB
Output SPL at 15 Hz	105.4 dB
Output SPL at 20 Hz	111.1 dB
Output SPL at 25 Hz	115.5 dB
Output SPL at 31.5 Hz	119.6 dB
Output SPL at 40 Hz	121.3 dB
Output SPL at 50 Hz	122.0 dB
Output SPL at 63 Hz	122.1 dB
Output SPL at 80 Hz	121.9 dB
Output SPL at 100 Hz	121.9 dB
Output SPL at 125 Hz	121.9 dB
RCA Input	Yes
TRS Input	No
USB Input	No
Warranty	5/3
Weight	117.1 lbs (53.1 kg)
XLR Input	Yes

• Links
  • JTR Speakers Captivator RS1 Website
• Reviews, Comparisons and Sound Samples
  • Independently measured by Audioholics; the published figures above come from this ASR subwoofer measurement thread.
• Head-to-Head Comparisons
  • JTR Speakers Captivator RS1 vs Rythmik FV15HP
  • JTR Speakers Captivator RS1 vs HSU Research VTF-3 MK5 HP
  • JTR Speakers Captivator RS1 vs Monoprice Monolith 16 THX Ultra