JBL HDI-1200P vs Monoprice Monolith 16 THX Ultra

Last updated: September 19, 2026

Short answer: the Monoprice Monolith 16 THX Ultra for output per dollar, the JBL HDI-1200P for a smaller build. Monoprice’s 16-inch ported driver and THX Ultra certification deliver a 126.5dB CEA-2010-A average, and it costs $2300, $10 less than the JBL at $2310. The catch is weight at 78 kg (172 lbs), and the ported design can interact with room acoustics; the JBL uses a dual-ported 1000W 12-inch high-excursion cone.

JBL HDI-1200P vs Monoprice Monolith 16 THX Ultra

The case for the JBL HDI-1200P: Dual-ported 1000W 12-inch high-excursion cone.

What the Monoprice Monolith 16 THX Ultra gets right: 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. Set against that: Heavy at 78 kg (172 lbs) and ported design can interact with room acoustics.

Buy the Monoprice Monolith 16 THX Ultra. It is rated higher for sound quality than the JBL HDI-1200P and costs less, which settles it without a real tradeoff to make.

Looking for alternatives? See the complete Subwoofers rankings.

Specifications Side By Side

JBL HDI-1200P Monoprice Monolith 16 THX Ultra
Price$2,310$2,300
Ranked#24 of 145 in Medium Home Subwoofers (30-75 lbs)#18 of 110 in Large Home Subwoofers (Over 75 lbs)
Enclosureported, bottomported, front
Output SPL at 25 Hz93.2 dB123.3 dB
Output SPL at 31.5 Hz109.5 dB125.1 dB
Output SPL at 40 Hz115.6 dB126.3 dB
Output SPL at 50 Hz119.1 dB126.5 dB
Output SPL at 63 Hz119.0 dB126.6 dB
Output SPL at 80 Hz114.9 dB126.8 dB
Output SPL at 100 Hz115.4 dB127.2 dB
Output SPL at 125 Hz117.2 dB127.6 dB
CEA-2010-A Average (40-80Hz)117.2 dB126.5 dB
Dimensions16.9"H x 16.3"W x 17.8"D (430.5 x 414.0 x 451.4 mm)25.6"H x 22"W x 28.1"D (650.2 x 558.8 x 713.7 mm)
Weight70.8 lbs (32.1 kg)171.5 lbs (77.8 kg)
Warranty55
Cabinet Colorblack, woodblack
CountryUnited StatesUnited States
Measurement SourceAudioholicsAudioholics
Frequency Response28-150Hz (-6dB)-
Amplifier Power1000W RMS-
Crossover Frequency50-150Hz, 24dB/octave-
InputsRCA (unbalanced) and XLR (balanced)XLR, RCA, XLR out
FeaturesSingle-band parametric EQ-
Drivers12" (305mm) driver16" (406mm) driver
XLR InputYesYes
RCA InputYesYes
TRS InputNoNo
Optical InputNoNo
Coaxial InputNoNo
USB InputNoNo
HDMI InputNoNo
AES InputNoNo
Aux InputNoNo
Output SPL at 15 Hz-107.3 dB
Output SPL at 20 Hz-118.4 dB

How Monoprice Monolith 16 THX Ultra compares with other leading options:

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

JBL HDI-1200P: $2,310 eBay

JBL HDI-1200P ranking card

Pros: Dual-ported 1000W 12-inch high-excursion cone. Symmetric Field motor design controls stray magnetic flux for refined response. Plays very clean with super low distortion (<1% THD) down to tuning frequency. Dual down-firing ports extend low-end with 28-150Hz frequency response. Adjustable crossover (50-150Hz) and phase control for seamless integration. Compact ~17-inch cube with automotive-gloss or furniture-grade finishes.

Full JBL HDI-1200P review and specifications →

AES InputNo
Amplifier Power1000W RMS
Aux InputNo
CEA-2010-A Average (40-80Hz)117.2 dB
Cabinet Colorblack, wood
Coaxial InputNo
CountryUnited States
Crossover Frequency50-150Hz, 24dB/octave
Dimensions16.9"H x 16.3"W x 17.8"D (430.5 x 414.0 x 451.4 mm)
Drivers12" (305mm) driver
Enclosureported, bottom
FeaturesSingle-band parametric EQ
Frequency Response28-150Hz (-6dB)
HDMI InputNo
InputsRCA (unbalanced) and XLR (balanced)
Measurement SourceAudioholics
Optical InputNo
Output SPL at 25 Hz93.2 dB
Output SPL at 31.5 Hz109.5 dB
Output SPL at 40 Hz115.6 dB
Output SPL at 50 Hz119.1 dB
Output SPL at 63 Hz119.0 dB
Output SPL at 80 Hz114.9 dB
Output SPL at 100 Hz115.4 dB
Output SPL at 125 Hz117.2 dB
RCA InputYes
TRS InputNo
USB InputNo
Warranty5
Weight70.8 lbs (32.1 kg)
XLR InputYes
Search eBay for JBL HDI-1200P →

Monoprice Monolith 16 THX Ultra: $2,300 eBay

Monoprice Monolith 16 THX Ultra ranking card

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 →

AES InputNo
Aux InputNo
CEA-2010-A Average (40-80Hz)126.5 dB
Cabinet Colorblack
Coaxial InputNo
CountryUnited States
Dimensions25.6"H x 22"W x 28.1"D (650.2 x 558.8 x 713.7 mm)
Drivers16" (406mm) driver
Enclosureported, front
HDMI InputNo
InputsXLR, RCA, XLR out
Measurement SourceAudioholics
Optical InputNo
Output SPL at 15 Hz107.3 dB
Output SPL at 20 Hz118.4 dB
Output SPL at 25 Hz123.3 dB
Output SPL at 31.5 Hz125.1 dB
Output SPL at 40 Hz126.3 dB
Output SPL at 50 Hz126.5 dB
Output SPL at 63 Hz126.6 dB
Output SPL at 80 Hz126.8 dB
Output SPL at 100 Hz127.2 dB
Output SPL at 125 Hz127.6 dB
RCA InputYes
TRS InputNo
USB InputNo
Warranty5
Weight171.5 lbs (77.8 kg)
XLR InputYes
Search eBay for Monoprice Monolith 16 THX Ultra →