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MartinLogan BalancedForce 210 Walnut Subwoofer - BF210WAL

Abt Model: BF210WAL | UPC: 877929009519
Special Order: 7 To 14 Day Delivery Time
Your Shipping Zip Code: 20149
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Product Details

MartinLogan BalancedForce 210 Walnut Subwoofer -  BF210WAL

Two 10-inch high-excursion, aluminum cone woofers
850 watts (1,700 watts peak)

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 for 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.
  • 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.


  • System Frequency Response: 20–120 Hz ±3dB; Anechoic through LFE effects input
  • Low Pass Filter Frequencies: 30 - 80Hz
  • Phase: 0°, 90°, 180°, 270°
  • 25Hz Level Control: ±10dB at 25Hz
  • Power Control: On, Auto (12V Trigger), Off
  • Room Correction: Perfect Bass Kit (PBK) Ready (Sold Separately)
  • Woofers: Two 10" (25.4cm) cast-basket, highexcursion, aluminum cone with extended throw driver assembly, sealed non-resonant asymmetrical chamber format
  • Amplifiers: 850 watts (1,700 watts peak)
  • 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)
  • Output (RCA): Multi Out (for multi-sub connection)
  • Input Impedance:
    • RCA: 10,000 Ohms
    • XLR: 15,000 Ohms per phase
    • Speaker Level: 10,000 Ohms per phase (20,000 Ohms red to black)
  • Power Draw:
    • Typical: 125 Watts
    • Idle: 15 Watts

Approximate Dimensions:

  • Height: 19"
  • Width: 19.1"
  • Depth: 19.4"

Approximate Weight:

  • Shipping: 96 lbs

Warranty Information:

  • Manufacturer Warranty (authorized online retailer): 3 Years Limited
California customers: Proposition 65 WARNING - learn more
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Key Features
Sold As Each/ 20-120kHz +/-3dB System Frequency Response/ 30 - 80Hz Low Pass Filter Frequencies/ Two 10" Cast-Basket, Highexcursion, Aluminum Cone With Extended Throw Driver Assembly Woofers/ 850 Watts Amplifiers/ 10,000 Ohms RCA Input Impedance/ 15,000 Ohms Per Phase XLR Input Impedance/ 125 Watts Typical Power Draw/ Walnut And Black Finish
More reasons to buy the MartinLogan BF210WAL from Abt Electronics
  • is an authorized dealer (Learn More).
  • The MartinLogan BF210WAL is Brand New.
  • The MartinLogan BF210WAL Ships in a Factory Sealed Box.
Amplifier TypeUltra-Efficient
ConnectivityRCA, XLR
Frequency Response20 - 120kHz +/-3db
Impedance10K Ohms
Power125 Watts
Speaker TypeSubwoofer
Woofer Size (inches)10
Height (inches)19
Width (inches)19.1
Depth (inches)19.4


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