JTR Speakers Captivator S2 vs Monoprice Monolith M-15 V2

Short answer: the JTR Speakers Captivator S2 if sound quality matters most, the Monoprice Monolith M-15 V2 if price matters most. The JTR Speakers Captivator S2 ranks #9 of 110 subwoofers, rated 4.5/5, at $3995. The Monoprice Monolith M-15 V2 ranks #64, rated 4.2/5, at $1500, $2495 cheaper.

Buy the JTR Speakers Captivator S2 if sound quality is the priority over the price, or the Monoprice Monolith M-15 V2 if the price is the priority over sound quality.

Looking for alternatives? See the complete Subwoofers rankings.

Specifications Side By Side

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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.

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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 →

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.
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Monoprice Monolith M-15 V2: $1,500 Discontinued eBay

Pros: Published CEA-2010 specifications list 112.6 dB at 20 Hz and 120.0 dB through 40-80 Hz. Its front-ported 15-inch design has substantial deep-bass and midbass headroom for cinema playback.

Cons: Discontinued and no longer sold new. At 60.3 kg and 729.0H x 449.6W x 680.7D mm, it needs committed floor space and careful room integration. Discontinued.

Notes: Product # 42851

Full Monoprice Monolith M-15 V2 review and specifications →

AES Input	No
Aux Input	No
CEA-2010-A Average (40-80Hz)	120.0 dB
Cabinet Color	black
Coaxial Input	No
Country	United States
Dimensions	28.7"H x 17.7"W x 26.8"D (729.0 x 449.6 x 680.7 mm)
Discontinued	Yes
Drivers	15" (381mm) driver
Enclosure	ported, front
HDMI Input	No
Inputs	XLR, RCA
Measurement Source	Manufacturer
Optical Input	No
Output SPL at 12.5 Hz	91.0 dB
Output SPL at 15 Hz	106.3 dB
Output SPL at 20 Hz	112.6 dB
Output SPL at 25 Hz	116.6 dB
Output SPL at 31.5 Hz	119.5 dB
Output SPL at 40 Hz	120.9 dB
Output SPL at 50 Hz	120.6 dB
Output SPL at 63 Hz	120.0 dB
Output SPL at 80 Hz	118.7 dB
Output SPL at 100 Hz	120.1 dB
Output SPL at 125 Hz	120.2 dB
RCA Input	Yes
TRS Input	No
USB Input	No
Warranty	5
Weight	132.9 lbs (60.3 kg)
XLR Input	Yes

• Reviews, Comparisons and Sound Samples
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