美國 Martin Logan 
 ■ 喇叭單體 ＆ 單音箱型式 | |
| 超低音單體 尺寸規格：(？吋) （Super Woofer Driver） | Two 12" (30.5cm) cast-basket, highexcursion, aluminum cone with extended throw driver assembly, sealed non-resonant asymmetrical chamber format |
| 超低音單體 單體數量：(？支) | |
| 單體設計材質：（例：鋁製夾心圓錐） | |
| 主動式 or 被動式 系統 | |
| 頻率響應 ？Hz ~ ？kHz 數值範圍 ( Frequency Response ) | 18–120 Hz ±3dB; Anechoic through LFE effects input |
| 設計型式 1：低音反射式 / 密閉 氣墊式 | |
| 設計型式 2：低音單體~正面發聲 / 低音單體~向下發聲 | |
| 設計型式 3：✔ 推挽式 | |
| ■ 擴大機功率 ＆ 頻率範圍調整 ＆ 輸出入端子 | |
| 擴大機 輸出功率 ( RMS / 峰值 ) ？瓦 | 2 x 850 watts (3,400 watts peak system total) |
| 頻率響應 ？Hz ~ ？kHz 數值範圍 ( Frequency Response ) | |
| ✔ 低通濾波 ( 連續可調 ) | ✔ |
| ✔ 低通濾波 ( 使用 無線介面 App 調整 ) | |
| ✔ 相位選擇 | ✔ |
| 輸入端子：RCA x ？組 ／ 高電位 x ？組 | 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) |
| 輸出端子：RCA x ？組 ／ 高電位 x ？組 | Multi Out (for multi-sub connection) |
| ✔ 自動電源啟閉 ( Auto Power ) | |
| ■ 外觀型式 | |
| 外觀顏色 ( 表面材質處理 ) | |
| 外觀尺寸 ( 高 × 寬 × 深 mm） ( Dimensions ( H × W × D mm)) | 574 x 574 x 582 mm |
| 淨重： 公斤 kg 數值 （ Net Weight / kg ） | 63.5kg |
•Martin Logan BalancedForce 212 超低音 規格表
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Martin Logan BalancedForce 212 超低音
雙低失真低音單元配對大功率磁體結構，10 - 和12英寸鋁盆隔膜提供巨大的偏移和聲音輸出，同時保留分鐘的低音細節，都沒有失真的暗示。圓錐體材料的特殊阻尼特性保證了平穩，無共振必要的無縫混合具有高分辨率全頻揚聲器的響應。
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.
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. BalancedForce 212
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).
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.
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.
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.
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