Monoprice Monolith 16 THX Ultra vs JTR Speakers Captivator 215PRO

Short answer: the JTR Speakers Captivator 215PRO if sound quality matters most, the Monoprice Monolith 16 THX Ultra if price matters most. The JTR Speakers Captivator 215PRO ranks #7 of 110 subwoofers at $3500. The Monoprice Monolith 16 THX Ultra ranks #18 at $2300, $1200 cheaper.

What the Monoprice Monolith 16 THX Ultra offers: 16-inch ported driver and THX Ultra certification deliver 126.5dB CEA-2010-A average at a fraction of the price of the subwoofers ranked above it. Watch for: Heavy at 78 kg and ported design can interact with room acoustics.

What the JTR Speakers Captivator 215PRO offers: Independent CEA-2010 testing records 106.6 dB at 20 Hz and 130.7 dB through 40-80 Hz. The ported, front enclosure with 2x 15” (381mm) drivers delivers formidable upper-bass output for movie effects and music. Watch for: Deep-bass output is more limited than the strong 40-80 Hz result suggests, so it is not the right choice when the lowest movie effects are the priority. The 1016.0H x 457.2W x 762.0D mm cabinet and 67.6 kg mass still require deliberate placement and calibration.

Buy the Monoprice Monolith 16 THX Ultra if the price matters more than sound quality. Buy the JTR Speakers Captivator 215PRO if sound quality matters more than the price.

Want more options? Browse the full Subwoofers rankings.

Specifications Side By Side

Related Speaker Comparisons

How JTR Speakers Captivator 215PRO compares with other leading options:

• JTR Speakers Captivator 215PRO vs Power Sound Audio (PSA) TRIAX
• JTR Speakers Captivator 215PRO vs JTR Speakers Captivator 4000ULF
• JTR Speakers Captivator 215PRO vs Power Sound Audio (PSA) T18
• JTR Speakers Captivator 215PRO vs JTR Speakers Captivator S2
• JTR Speakers Captivator 2400 vs Monoprice Monolith 16 THX Ultra

Prices on this page were last checked September 14, 2026 at 1:47 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

Monoprice Monolith 16 THX Ultra: $2,300 eBay

Pros: 16-inch ported driver and THX Ultra certification deliver 126.5dB CEA-2010-A average at a fraction of the price of the subwoofers ranked above it.

Cons: Heavy at 78 kg and ported design can interact with room acoustics.

Notes: Product # 42031

Full Monoprice Monolith 16 THX Ultra review and specifications →

CEA-2010-A Average (40-80Hz)	126.5 dB
Cabinet Color	black
Country	United States
Dimensions	25.6"H x 22"W x 28.1"D (650.2 x 558.8 x 713.7 mm)
Drivers	16" (406mm) driver
Enclosure	ported, front
Measurement Source	Audioholics
Output SPL at 15 Hz	107.3 dB
Output SPL at 20 Hz	118.4 dB
Output SPL at 25 Hz	123.3 dB
Output SPL at 31.5 Hz	125.1 dB
Output SPL at 40 Hz	126.3 dB
Output SPL at 50 Hz	126.5 dB
Output SPL at 63 Hz	126.6 dB
Output SPL at 80 Hz	126.8 dB
Output SPL at 100 Hz	127.2 dB
Output SPL at 125 Hz	127.6 dB
Warranty	5
Weight	171.5 lbs (77.8 kg)

• Links
  • Monoprice Monolith 16 THX Ultra 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
  • Monoprice Monolith 16 THX Ultra vs Harbottle Audio C24 L2
  • Monoprice Monolith 16 THX Ultra vs Funk Audio Ultra 21.0LX
  • Monoprice Monolith 16 THX Ultra vs Funk Audio Classic 18.0
  • Monoprice Monolith 16 THX Ultra vs JTR Speakers Captivator 2400
  • Monoprice Monolith 16 THX Ultra vs Reaction Audio PV-15X
  • Monoprice Monolith 16 THX Ultra vs Harbinger V2218S
  • Monoprice Monolith 16 THX Ultra vs Danley Sound Labs DTS10
  • Monoprice Monolith 16 THX Ultra vs Rythmik FV25HP
  • See all 54 comparisons

JTR Speakers Captivator 215PRO: $3,500 eBay

Pros: Independent CEA-2010 testing records 106.6 dB at 20 Hz and 130.7 dB through 40-80 Hz. The ported, front enclosure with 2x 15” (381mm) drivers delivers formidable upper-bass output for movie effects and music.

Cons: Deep-bass output is more limited than the strong 40-80 Hz result suggests, so it is not the right choice when the lowest movie effects are the priority. The 1016.0H x 457.2W x 762.0D mm cabinet and 67.6 kg mass still require deliberate placement and calibration.

Notes: Looks like “PA sub”

Full JTR Speakers Captivator 215PRO review and specifications →

CEA-2010-A Average (40-80Hz)	130.7 dB
Cabinet Color	black
Country	United States
Dimensions	40"H x 18"W x 30"D (1016.0 x 457.2 x 762.0 mm)
Drivers	2x 15" (381mm) drivers
Enclosure	ported, front
Measurement Source	Audioholics
Output SPL at 15 Hz	103.6 dB
Output SPL at 20 Hz	106.6 dB
Output SPL at 25 Hz	122.1 dB
Output SPL at 31.5 Hz	126.8 dB
Output SPL at 40 Hz	129.3 dB
Output SPL at 50 Hz	131.2 dB
Output SPL at 63 Hz	131.3 dB
Output SPL at 80 Hz	130.9 dB
Output SPL at 100 Hz	130.7 dB
Output SPL at 125 Hz	131.1 dB
Warranty	5
Weight	149 lbs (67.6 kg)

• Links
  • JTR Speakers Captivator 215PRO 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 215PRO vs JTR Speakers Captivator 4000ULF
  • JTR Speakers Captivator 215PRO vs Power Sound Audio (PSA) T18
  • JTR Speakers Captivator 215PRO vs JTR Speakers Captivator S2
  • JTR Speakers Captivator 215PRO vs Power Sound Audio (PSA) TRIAX