Scheduled Delivery to Ashburn
learn more
Scheduled delivery to your door.
A scheduled delivery is available only Monday - Friday during normal business hours and used for heavy and oversized items (large TVs, large furniture and large appliances). This service includes delivery to the main entrance or garage (but does not include stairs). This service does not include unpacking, plugging in, installation or debris removal.

Note: Scheduled delivery services are available to most of the contiguous United States (available in parts of Alaska and Hawaii). Call 888-228-5800 for more information.

MartinLogan BalancedForce 212 Gloss Black Subwoofer - BALFOR212HGBK

Abt Model: BALFOR212HGBK | UPC: 877929009557
Special Order: 7 To 14 Day Delivery Time
Your Shipping Zip Code: 20149
Free Shipping Details
Ships in Original Packaging - details
This item ships via scheduled delivery. Signature is required.
Need it installed? View installation options

Product Details

MartinLogan BalancedForce 212 Gloss Black Subwoofer - BALFOR212HGBK

Building on the groundbreaking technology of the original Descent, BalancedForce 212 incorporates new features and enhancements that simplify system integration while improving performance. Its signature two-driver, force-canceling configuration virtually eliminates bass-blurring cabinet resonance. And each rugged, custom-built aluminum-cone driver is driven by sophisticated DSP-based, high-power amplifiers. The result is dynamic, unrestrained output to the very lowest frequencies, yet with clarity and definition approaching that of electrostatic transducers.


  • Ultimate Performance Subwoofers
    Chances are you've read or heard at some time that adding a subwoofer to a system built around electrostatic speakers is nearly impossible. Although that's not necessarily true (and we have the subwoofers to prove it), the idea is grounded in experience. For many years subwoofers and electrostats did not blend very well. Turn on the sub and maybe you got the deeper, stronger bass you were looking for but that wonderful electrostatic snap and midrange clarity were, if not gone, now smeared and disconnected.
    Our goal, when we began our first subwoofer project, was to deliver the good stuff — deep, tight, powerful bass — and none of the bad. We wanted to build subwoofers that, when combined with ultra-fast electrostatics or conventional cone speakers, would blend seamlessly to the very bottom of the frequency extreme. BalancedForce subwoofers are the full realization of years of engineering by the MartinLogan team combined with the latest innovations in advanced digital signal processing, amplification, electrical system designs, and room correction.
  • BalancedForce® Alignment
    Opposing Aluminum Element Woofers or Deep, Clean Bass

    Dual low-distortion woofers pair a high-power magnet structure with 10- and 12-inch aluminum cone diaphragms to deliver huge excursion and sound output while preserving minute bass details, all without a hint of distortion. The cone material's exceptional damping properties ensure the smooth, non-resonant response necessary for seamless blending with high-resolution full-range loudspeakers.
    These woofers, spaced 180 degrees apart in a 'BalancedForce' configuration, operate in exact opposition, to nullify distortion causing cabinet vibrations and deliver pure bass energy. Traditional subwoofer enclosures suffer from an equal and opposite reaction to the cone's movement, generating acoustic vibrations within the cabinet. You feel this by touching the cabinet. Although the "physics" of this phenomenon actually cause a subwoofer cabinet to resonate or even dance, most subwoofer designers apply weight or mass to the cabinet to minimize such disturbances, but still leave one byproduct—"smeared bass". BalancedForce is an elegantly simple solution that removes the variable of cabinet vibration contributions from the acoustic equation.
  • Amplifier Design
    Advanced Ultra-Efficient D-Class Amplifier

    BalancedForce subs match powerful proprietary switching amps with incredible woofer drivers resulting in tightly defined bass while keeping distortion at the lowest possible levels. The BalancedForce 210 features an 850-watt class-D switching amplifier capable of a 1700-watt peak operating at over 90% efficiency. BalancedForce 212 features dual 850-watt amplifiers (one for each woofer) with a total system power of 1700-watts (3400-watts system peak).
    Low-noise, high-power transformers and switching power supplies feature high-quality MOSFET transistors, noise-suppression networks, and control circuitry to provide tremendous levels of current with extremely low levels of distortion. Split power supply rails minimize distortion while maximizing switching efficiency. Military grade glass epoxy circuit boards, temperature sensors, and protection circuitry guarantee quality sound and reliable trouble-free operation.
  • PBK Room Correction & 25Hz Level Control
    Although correct placement plays a key role in optimizing subwoofer performance, positioning a subwoofer often requires compromises. The optional MartinLogan Perfect Bass Kit (PBK, sold separately) uses a computer and microphone to listen throughout the listening environment and tailor the sub's performance to the unique acoustic properties of a room—resulting in clean, powerful bass down to the lowest frequencies.
    Additionally, a built-in 25Hz level control allows listeners to adjust subwoofer output by ±10dB and compensate for excessive room gain by cutting output in the 20- to 30-Hz range, or to accentuate the feeling of deep-bass energy by augmenting those frequencies.
  • Custom Low-Pass Filters for Individual Loudspeaker Models
    Custom tailored low pass filters are available for nearly every floor standing MartinLogan loudspeaker released in the last 30 years. These optional custom filters adjust the subwoofer's low pass settings to seamlessly blend with the roll-off characteristics of individual loudspeaker models. Filters are easily installed via a user-friendly process involving a USB thumb drive and are available for free download. Many unique filters are currently available and additional filters will be added as new speakers are released.
  • Beautiful Finishes
    High-gloss black cabinets and top trim are standard. Top trim is available in a variety of optional high-gloss, hardwood, and real-wood veneer finishes.
  • Sealed Cabinets
    Although ports are a convenient and cost-effective way of increasing low-frequency output, their reliance on resonant energy impairs bass quality. The BalancedForce subwoofer's sealed system exhibits less transient-blurring group delay while maintaining smooth, consistent response, regardless of music or movie source material.
  • Multiple Input Options
    Simultaneous LFE and 2-Channel Connections for Seamless System Integration

    Robust connection and control systems allow simultaneous connection of both 2-channel stereo music and multi-channel home theater and allows each source to have individual crossover and level settings, giving listeners a perfect performance in every application. LFE input via RCA or XLR effectively uses no low-pass filter, leaving crossover control to the processor. Left and right RCA, XLR, and speaker level inputs integrate discrete user-adjustable or speaker specific custom-installed audiophile grade low-pass filters allowing different level and crossover points when playing back two channel music.
  • Top Mounted Controls
    Top mounted controls are discretely hidden beneath a smoked glass accent panel allowing easy access to fine tune the subwoofer's settings.
  • Unlimited Adjustments
    Access the top mounted control panel by pushing firmly on the smoked glass panel. You'll find all of your standard subwoofer controls like Level, Low-Pass Filter and Phase, plus some that are unique to MartinLogan.
    A unique tone sweep feature assists users in locating areas in listening rooms where troublesome rattles or resonances may occur. A single press of a button allows listeners to initiate a tone sweep from 120–20Hz. If a rattle or resonance occurs in the room a second press of the button holds the current frequency allowing the listener to investigate and identify the source.
    An 'On/Auto (Trigger)/Off' switch controls the subwoofer's energy saving feature. The 'On' setting prevents the sub from entering energy saving mode. When set to 'Auto (Trigger)', the sub will turn on when a music signal is detected and off after several minutes without a signal. If a 12-volt trigger is connected, the triggering device will turn the subwoofer on and off.
    Further flexibility is afforded by custom energy transfer coupler (ETC™) spikes, which can enhance stability on thick carpets, or create tighter coupling between subwoofer and floor to enhance overall sound quality.


  • Frequency Response: 18–120 Hz ±3dB; Anechoic through LFE effects input
  • Low Pass Filter Frequency: 30 - 80Hz
  • Low Frequency Transducer: Two 12" (30.5cm) cast-basket, highexcursion, aluminum cone with extended throw driver assembly, sealed non-resonant asymmetrical chamber format
  • Room Correction (Bass Section): Perfect Bass Kit (PBK) Ready (Sold Separately)
  • Amplifier: 2 x 850 watts (3,400 watts peak system total)
  • Impedance:
    • RCA: 10,000 Ohms
    • XLR: 15,000 Ohms per phase
    • Speaker Level: 10,000 Ohms per phase (20,000 Ohms red to black)
    • Compatible with 4, 6, or 8 Ohm rated amplifiers.
  • Audio Controls: On, Auto (12V Trigger), Off
  • Inputs:
    • RCA: Left, Right and LFE.
    • XLR: Left, Right and LFE.
    • Speaker Level: Left and Right banana jacks.
    • 12V Trigger: 3.5mm
    • Mini USB (for PBK)
    • USB (for crossover & firmware updates)
  • Power Draw:
    • Typical: 250 Watts
    • Idle: 30 Watts

Approximate Dimensions:

  • Height: 22.9"
  • Width: 22.6"
  • Depth: 22.6"

Approximate Weight:

  • Unit: 140 lbs
  • Shipping: 150 lbs

Warranty Information:

  • Manufacturer Warranty (authorized online retailer): 3 Years Limited
California customers: Proposition 65 WARNING - learn more
Downloadable Resources
Get Adobe Reader
Key Features
Sold As Each/ 18-120 Hz+/-3dB Frequency Response/ 30 - 80Hz Low Pass Filter Frequency/ Two 12" Cast-Basket, Highexcursion, Aluminum Cone With Extended Throw Driver Assembly Transducer/ 2 x 850 Watts Amplifier/ 10,000 Ohms RCA Impedance/ 15,000 Ohms Per Phase XLR Impedance/ 250 Watts Typical Power Draw/ Gloss Black Finish
More reasons to buy the MartinLogan BalancedForce 212 Gloss Black Subwoofer BALFOR212HGBK from Abt Electronics
  • is an authorized dealer (Learn More).
  • The MartinLogan BalancedForce 212 Gloss Black Subwoofer BALFOR212HGBK is Brand New.
  • The MartinLogan BalancedForce 212 Gloss Black Subwoofer BALFOR212HGBK Ships in a Factory Sealed Box.
Amplifier TypeUltra-Efficient
ConnectivityRCA, XLR
Frequency Response18 - 120 Hz +/-3dB
Impedance10K Ohms
Power250 Watts
Speaker TypeSubwoofer
Woofer Size (inches)12
Height (inches)22.9
Width (inches)22.6
Depth (inches)22.6


Check here if you only want to add the selected accessories
to the cart and click the "add to cart" button for this item.
sign up for our newsletter
Join Our Email List & Get $25 Off your next order of $250 or more.