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Monoprice Shakes Things Up With Two New Massive THX Subwoofers [Updated]

Monoprice has expanded its Monolith subwoofer range with very powerful THX Ultra certified 13-inch and 16-inch subwoofers.

Monoprice Monolith 13-inch THX Ultra Subwoofer Angle

In order to have a great home theater setup, you need a good subwoofer, and to that end, Monoprice is offering up two that provide more power and low-end bass response than most home theater enthusiasts could possibly hope for.

The two Monolith subwoofers are offered in compact 13-inch and large 16-inch sizes. Let’s take a look at what they offer. 

What Both Subwoofers Have in Common

THX Certification Process

THX Ultra Certification: This means that these subwoofers have been submitted and passed THX standards for application and performance. 

Lots of Power Output: 2,000-watt (RMS)/3,800-watt (Peak) Class D amplifier with DSP (Digital Signal Processing)

Driver Design: A newly developed high-excursion driver capable of handling the above-mentioned power output without distortion. 

Flexible Port Design: The ports can be used in an open, semi-sealed, sealed setup. 

Cabinet Design and Finish: Sleek rounded-edge enclosures with a gray oak finish.

Digging Deeper – 13-inch THX Monolith Subwoofer

Monoprice Monolith 13-inch THX Ultra Subwoofer Front Back
Monoprice Monolith 13-inch

Product Number: 41496 (13-inch model)

Driver Size: 13-inches

Driver Material:  2 layer long fiber pulp/glass fiber cone

Voice Coil: 100mm, with high-temperature aluminum wire and black anodized aluminum bobbin construction.

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Magnet: 300 oz (that’s 19 pounds!) 

Enclosure: The enclosure is made of High-Density Fiberboard (HDF) that is horizontally and vertically braced. 3 ports are provided on the 13-inch model and 4 ports are provided on the 16-inch model, all of which can be left open, partially, or fully sealed depending on application and preference. 

Monoprice Monolith 13-inch THX Ultra Subwoofer Interior
Frequency Response (-6db)Sealed PortsVented Ports (2)Vented Ports (3)
Extended EQ N/A16 to 200Hz16 to 200Hz
THX EQ20 to 200 Hz19 to 200Hz20 to 200Hz

Harmonic Distortion: Less than 1% from 20-100 Hz (90dB @ 1m reference point)

Variable Level Control: +15/‑20 dB

Reference Level: 100mV @ 40Hz (89dB @ 1m)

Crossover Control: Inline/Bypass variable from 40 to 160 Hz,

Phase Control: 0 to 180 degrees variable (used to match the in/out motion of the subwoofer driver to the rest of the speakers in your system).

Inputs: 2 RCA, 1 XLR

Outputs: 1 XLR

Signal Turn On: Selectable always on or Auto-Detect.

Auto Turn Off Time: 30 minutes

Dimensions: 23.8″ x 20.3″ x 29.1″ (605 x 515 x 740 mm)

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Weight: 153.2 lbs. (69.5 kg)

Finish: Black Ash

Digging Deeper – 16-inch THX Monolith Subwoofer

Monoprice Monolith 16-inch THX Ultra Subwoofer Front Back
Monoprice Monolith 16-inch

The majority of the specifications for the 16-inch model are identical to the 13-inch model, including the inputs, output, and control options.

Here are the features and specifications that are different in the 16-inch Monolith THX Subwoofer.

Driver Size: 16-inches

Number of Ports: 4 (can be sealed or vented)

Frequency Response (-6db) with Extended EQ Operation

  • Sealed Ports: N/A
  • Vented Ports (1): 17 to 200Hz
  • Vented Ports (2): 14 to 200Hz
  • Vented Ports (3): 14 to 200Hz
  • Vented Ports (4): 16 to 200Hz

Frequency Response (-6db) with THX EQ Operation

  • Sealed Ports: 20 to 200Hz
  • Vented Ports (1): 17 to 200Hz
  • Vented Ports (2): 24 to 200Hz
  • Vented Ports (3): 14 to 200Hz
  • Vented Ports (4): 16 to 200Hz

Dimensions: 25.6″ x 22.0″ x 28.1″ (650 x 560 x 715 mm)

Weight: 171.6 lbs. (77.8 kg)

Finish: Black Ash

Monoprice Monolith 16-inch THX Subwoofer Diagram

Price & Availability

  • The 13-inch Monoprice Monolith THX Ultra Certified Subwoofer (Product Number 41496) is available for $1,599 at Monoprice.com
  • The 16-inch Monoprice Monolith THX Ultra Certified Subwoofer (Product Number 42031) is available for $2,299 at Monoprice.com.

UPDATE 11/3/21: Monoprice adds to its Monolith THX subwoofer line with three models in 10, 12, and 15-inch sizes. Read our full report.

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