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    Monolith 10" THX Select Subwoofer
    Product # 24456
    In Stock This item should ship today (1/16/2018) if ordered within 2 hours 32 minutes

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    Monolith 10" THX Select Subwoofer

    Monolith THX Select Subwoofer

    The Monolith THX® certified subwoofer sets the standard for bass output, low distortion, and affordability. With chest thumping bass that plays down to well under 20Hz, the Monolith subwoofer unleashes cinema level volume, with the ability to convey and articulate the subtle nuances of music.

    THX Select Certified
    500 Watt Amplifier

    THX Select Certified
    500 Watt Amplifier

    THX Select Certified: THX® engineers completed hundreds of different scientific tests to ensure the highest audio performance possible. The tests ensure the speaker can reach the high volumes necessary to achieve THX Reference Level without creating audible distortion or artifacts. THX Certified Select products are for medium sized rooms, up to 2,000 cubic feet in size, with a 10-12 foot viewing distance from the screen.

    10" Woofer: The Monolith 10" driver was developed from the ground up, with a design focus on of achieving output, accuracy, dynamics, and linearity, while minimizing distortion. Enclosed in a cabinet made from HDF material, massive internal bracing, and outfitted with a single port that can utilize a foam plug to run the subwoofer in a sealed mode.

    500 Watt Amplifier: The 500W RMS amplifier is built around a Texas Instrument 48-bit data path (with 28-bit filter coefficients) and DSP engine. Each amplifier's transfer function, power output limiting and thermal protection are monitored to the millisecond and are customized for each individual driver. The high efficiency Class D amplifier modules are based on a proven topology that has been continuously refined over the past 4 years. The amplifier has vast reserves of power for highly accurate, deep bass for your home theater or music system.

    Performance Class

    THX Select

    THX® Certified Select products are for medium sized rooms, up to 2,000 cubic feet in size, with a 10-12 foot viewing distance from the screen.*

    * Previously known as Select2

    Anatomy of a Subwoofer

    10-inch Subwoofer

    Cabinet and Internal Bracing

    HDF (High Density Fiberboard), not MDF, was utilized resulting in a sonically inert cabinet. Internal bracing has been strategically placed to increase overall cabinet strength and limit unwanted panel vibrations that would cause discoloration and distortion. The strong cabinet and bracing combine to ensure you hear massive amounts of bass, not cabinet resonances.

    Ports and Grille

    The 10" model uses a single 88.5mm port with inner and outer flares. A port is used to ensure high SPL capability at low frequency (fb=21Hz). The dual flares help reduce turbulence and asymmetrical distortions. Additional adjustments can be made by sealing the port with the supplied plug. The "floating" grille is made from non resonant MDF to provide rigidity, while the entire structure is offset from the cabinet to maximize air flow of the woofer and ports.

    10-inch Driver

    10-inch Subwoofer

    Every part of this driver has been developed from the ground up and customized to deliver high output, low distortion, and accurate bass. Our unique hybrid cone combines long fiber pulp and fiberglass, taking advantage of the pulp's superior stiffness with the additional rigidity and lightweight properties of fiberglass, to deliver a driver of massive durability and excursion. The result is a cone that achieves optimal motion at all frequencies it is asked to produce and beyond.

    1. Lower Suspension

    FEA (Finite Element Analysis) modeling and Klippel laser based optimizations were used to design a cone that is capable of astounding >78mm peak-to-peak excursions. The lower and upper suspensions are designed together with the motor structure. The lower suspension is critical for maintaining very low levels of distortion at high excursions, which are required for high SPL at low frequencies.

    2. Spider and Cone Venting

    The spider is made from multiple layers of NOMEX with integrated tinsel leads hand stitched in place for low mass yet high strength and durability. The purpose of these vents are twofold -- first, they allow convective air flow to cool the voice coil and, second, they reduce asymmetrical compliance due to air compression under the cone/spider, which would appear as unwanted distortions.

    3. Woofer Surround

    FEA (Finite Element Analysis) modeling and Klippel laser based optimization were utilized to create this durable, high profile surround that’s made from a unique formulation of NBR (NITRILE RUBBER-acrylonitrile-butadiene copolymer). This formulation was developed after months of modeling and prototyping to ensure the highest levels of excursion, without sacrificing linearity or distortion.

    4. Motor Structure

    The motor is made of CNC milled low carbon steel in the modified undercut "T" pole assembly to focus the magnetic flux. Dual aluminum shorting rings are used to cancel eddy currents, further stabilizing the magnetic flux and significantly lowering distortion. The precision wound, high temperature, all aluminum bobbin (which has a lower thermal compression than copper) enable the voice coil to remain cool. The motor and suspension design is extremely critical for maintaining control of the driver's displacement over a very wide range of input signals, allowing the subwoofer to reach maximum performance and output levels while keeping distortion to a minimum.

    All Amp'd Up

    10-inch Subwoofer

    The Monolith subwoofer amplifier has an extraordinarily high power output of 500 watts RMS (900 watts peak), which can deliver massive amounts of power when needed. Each Class D amplifier is built around a Texas Instruments 48-bit data path (with 28-bit filter coefficients) DSP engine, allowing virtually unlimited design flexibility with the assurance of no signal degradation. Each amplifier's transfer function, power output limiting, and thermal protection are monitored to the millisecond and are customized for each individual woofer and cabinet air volume combination. This state-of-the-art Class D amplifier technology ensures maximum headroom capability, excellent transient response, high output, and very low distortion when driving the Monolith 10-inch THX Select certified subwoofer.

    CEA-2010 SPL Measurements @ 2 meters

    10-inch Subwoofer


      SPL @ 2m Distortion
    Hz Peak (dB) RMS (dB) THD% 2nd
    16 93.9 90.9 18.7% 16.8% 6.5%
    20 104.8 101.8 10.1% 9.3% 2.6%
    25 108.5 105.5 3.2% 0.4% 2.5%
    31 109.3 106.3 4.4% 2.9% 3.2%
    40 109.7 106.7 5.4% 4.9% 1.9%
    50 110.1 107.1 4.7% 4.4% 1.6%
    63 110.6 107.6 6.3% 5.2% 3.4%
    80 110.9 107.9 7.8% 6.8% 3.6%
    100 111.2 108.2 9.5% 9.0% 2.4%
    125 111.5 108.5 5.6% 4.8% 2.6%


      SPL @ 2m Distortion
    Hz Peak (dB) RMS (dB) THD% 2nd
    16 91.4 88.4 14.2% 4.2% 12.2%
    20 97.5 94.5 17.3% 2.7% 15.2%
    25 102.6 99.6 15.9% 9.8% 9.8%
    31 106.5 103.5 11.4% 8.6% 7.2%
    40 107.8 104.8 7.7% 6.0% 4.1%
    50 109.1 106.1 6.9% 5.8% 3.4%
    63 110.0 107.0 8.1% 6.5% 4.6%
    80 110.8 107.8 9.0% 8.5% 2.6%
    100 111.7 108.7 7.1% 6.4% 2.7%
    125 112.0 109.0 4.8% 4.5% 1.3%

    5 Year Warranty

    Buy with Confidence

    Monoprice not only stands behind every product we sell with a 5 year replacement warranty, we offer a 30-day money back guarantee as well! If the product you purchase does not satisfy your needs, send it back for a full refund.

    Quality at a Fair Price

    Quality at a Fair Price

    Monoprice's rugged design and rigid quality control standards deliver high quality products at fair prices.

    Hassle Free Packaging

    Hassle Free Packaging

    Monoprice exists to bring simplicity, fairness, and confidence to technology choices. This product features recyclable packaging that is simple to open, cost effective, with minimal waste, and fully protective as it travels to you.

    Service & Support

    Service & Support

    You're never on your own with Monoprice products! We have a full team of friendly and knowledgeable technicians available to answer your questions, both before and after the sale. Contact our technical support team for questions about our products, troubleshooting, or even suggestions for products to fit your particular needs. Not to be outdone, our friendly and helpful customer service team is here to make your ordering, delivery, and any possible returns a quick and painless operation, from start to finish!

    Support Files:

    THX® and the THX logo are trademarks of THX Ltd., registered in the U.S. and other countries.

    Model 24456
    Woofer 10" cone
    Cone Material 2 layer long fiber pulp/glass fiber cone
    Voice Coil 60mm with high temperature aluminum wire and black anodized aluminum bobbin
    Surround FEA optimized NBR (nitrile budadiene rubber)
    Motor FEA optimized, undercut T-pole focused field
    Magnet Ceramic Y35, 2 pcs total 144 oz.
    Xmax 18mm (one-way)
    Xmech 78mm (peak-to-peak)
    Enclosure Sealed or vented HDF cabinet with horizontal and vertical bracing
    Finish Black Ash
    Amplifier Class D 500Wrms
    Frequency Response (-6dB) Sealed Vented
         Extended EQ 28-200Hz 18-200Hz
         THX EQ 31-200Hz 20-200Hz
    Harmonic Distortion <1% 20-100Hz (90dB @ 1m)
    Variable Level Control +15/-20dB
    Crossover Inline/Bypass variable 40-160Hz
    Inputs RCA (2), XLR
    Outputs XLR
    Signal Turn On Selectable always on/auto
    Auto Turn Off 30 minutes
    Dimensions (H x W x D) 18.9" x 15" x 19.7" (480 x 380 x 500mm)
    Net Weight 72.5 lbs. (32.9 kg)
    Gross Weight 93.9 lbs. (42.6 kg)

    Start typing your question and we'll check if it was already asked and answered. Learn More
    Browse 8 questions Browse 8 questions and 9 answers
    Can you add maximum SPL in the various modes (THX, etc.) to the spec sheets for all of these new subwoofers? Thanks!
    Jason G on Sep 2, 2017
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    BEST ANSWER: We will be adding CEA-2010 @2M burst and RMS measurements by frequency in the near future.
    For long term, is a pair of tens as good as the twelves at normal listening levels? Main application music. And what is the trade off in sealed mode vs using an actual high quality sealed subwoofer? And how accurate musically is vented mode vs sealed?
    A shopper on Sep 21, 2017
    BEST ANSWER: All the Monolith subwoofers are very musical, and I think you will find them to be tight, even in ported mode. The main trade off in sealed vs ported is output down low.
    Under the "Full Specs" section the the frequency response is listed as 31-200Hz sealed with THX EQ, however in the manual it is stated as 20-200Hz for the same configuration. Which is correct?
    New User U on Nov 18, 2017
    Is the 10" driver cast or stamped steel?
    A shopper on Oct 31, 2017
    BEST ANSWER: All the Monolith subwoofer drivers are cast aluminum not stamped steel.
    is there financing?
    A shopper on Dec 2, 2017
    BEST ANSWER: Not by Monoprice.
    is there a dedicated on and off switch ?
    New User U on Jan 1, 2018
    BEST ANSWER: Yes. There’s a switch that turns on power to the unit as well as a standby on/off toggle. This sets the subwoofer to either turn off after 30 minutes, or to remain on until you turn off the power switch.
    How to daisy chain a pair, or 4?
    A shopper on Sep 15, 2017
    BEST ANSWER: You would need to daisy chain by utilizing the XLR pass through for 2 or 4 subwoofers.
    Would it be better to get to 10" for a room that is 25 x 15 ( about 3000 cubic ft) or one 12"?
    A shopper on Sep 10, 2017
    BEST ANSWER: I would recommend a single 12" subwoofer over the 10" for that size room. You could also look at utilizing 2 10" subwoofers as well.
    5.0 / 5.0
    3 Reviews
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Stars
    Awesome subwoofers
    I have two monolith 10inch subwoofers. Using balanced inputs these are some of the best subs I have heard/felt. They are day and night difference over another brand I have. The bass is clean and accurate. Musical basslines rollout right. Highly recommend these. Alway go dual if you can.
    December 16, 2017
    1 month ago
    Monolith Power!
    I purchased the monolith 10. I was using two Polk 505’s. I wondered before purchasing how much better could one 10 do against two 300 watt 12’s. Wow! The monolith 10 is a beast! Plays cleaner with more depth. The sound quality is outstanding. The power is all there. I will get another one just to improve the room having equal sweet spots. My family thinks I am crazy become the monolith has out preformed two subs. Buy it! My friend could not believe the sound quality. Outstanding purchase.
    January 14, 2018
    1 week ago
    Nice, Clean Punch
    I'll preface by saying I'm no audiophile, but a very discerning "pro-sumer." I have an ear for quality sound, and won't settle for thin or inaccurate sound. This sub is phenomenal! Listening to classical and instrumental music, the performance was clean and uniform (Cellos sounded particularly accurate- a feat I find even expensive subs struggle with.) Movie scores sounded majestic, and explosions from games or movies literally shook the wall! (When the wife allowed it to be that loud...) It punches deep when needed (explosions and such) and preforms clean and accurate (music.) Clean is the best word I can describe it with: across all frequencies the bass was very smooth. You would definitely need to experiment to your liking with the settings, but you will not be disappointed!
    I will also mention that Monoprice sent me this sub as a Christmas gift! I sent them a letter (poem actually) and they responded in kind with their own poem! The saved Christmas after my former sub gave out. Still, at this price point, this sub is still a steal of deal! Thank you Monoprice for a great product and great gift!
    January 6, 2018


    In Stock This item should ship today (1/16/2018) if ordered within 2 hours 32 minutes