{"product_id":"martinlogan-expression-esl-13a","title":"MartinLogan Expression ESL 13A Speakers | The Grid HiFi","description":"\u003ch1 data-pm-slice=\"1 1 []\"\u003e\u003cspan\u003eMartinLogan Expression ESL 13A Electrostatic Loudspeakers\u003c\/span\u003e\u003c\/h1\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eComplimentary White Glove Delivery • Travel Reimbursement*\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMartinLogan Expression ESL 13A\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is a Masterpiece Series hybrid electrostatic loudspeaker combining a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e44 × 13-inch XStat CLS electrostatic panel\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e with two independently powered 10-inch aluminum-cone woofers. The electrostatic transducer provides 572 square inches of radiating area for the frequencies above 300 Hz, while the active bass system extends response to a specified \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e24 Hz\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEach 10-inch woofer operates in its own sealed chamber and is driven by a dedicated \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e300-watt Class D amplifier\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, providing 600 watts of internal bass amplification per speaker. MartinLogan's 24-bit Vojtko DSP manages the low-frequency system, while PoweredForce Forward controls the interaction between the opposing woofers and the wall behind the speaker. Anthem Room Correction provides further optimization of the powered bass section for the listening environment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis combination gives the Expression ESL 13A the speed and controlled radiation of a large electrostatic panel with deep bass, substantial dynamic capability and far greater room adaptability than a traditional passive electrostatic design.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003e44 × 13-Inch XStat CLS Electrostatic Panel\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe Expression ESL 13A uses MartinLogan's \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eXStat Curvilinear Line Source electrostatic transducer\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, measuring 44 inches high by 13 inches wide with \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e572 square inches of radiating area\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe panel handles the entire spectrum above the 300 Hz crossover point.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eInstead of dividing the midrange and treble among conventional cone, dome and crossover systems, a single extremely lightweight diaphragm reproduces this broad frequency range.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe conductive diaphragm is suspended between perforated stators. As the musical signal changes the electrostatic field, force is applied across the diaphragm's entire surface.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWith very little moving mass and no conventional voice coil attached to the diaphragm, the XStat panel is capable of responding to extremely small signal changes.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eCurvilinear Line Source Technology\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eLarge flat electrostatic panels naturally become increasingly directional at high frequencies.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMartinLogan's \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eCurvilinear Line Source, or CLS, geometry\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e introduces a precisely controlled horizontal curvature into the panel.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Expression ESL 13A provides \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e30 degrees of horizontal dispersion\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e while maintaining a 44-inch vertical line source.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis controlled radiation pattern also influences how the loudspeaker interacts with the room. Relatively little acoustic energy is directed toward the side walls compared with a conventional wide-dispersion loudspeaker, reducing early lateral reflections that can interfere with stereo localization.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eDipole Electrostatic Radiation\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe XStat panel is a true \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003edipole transducer\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt radiates from both its front and rear surfaces, with the rear wave opposite in phase to the front. At the sides of the panel, these opposing wavefronts largely cancel.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe rear radiation remains an important part of the listening experience, contributing reflected energy from the wall behind the loudspeaker.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis makes positioning particularly important. MartinLogan recommends giving the electrostatic panel substantial distance from the wall behind it, allowing the rear wave to arrive sufficiently later than the direct sound from the front of the panel.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eMicroPerf Stator Technology\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe perforated stators surrounding the diaphragm must remain rigid while allowing acoustic output from the electrostatic membrane to pass through them.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMartinLogan's \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMicroPerf technology\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e increases the amount of exposed diaphragm surface compared with earlier stator designs.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis allows a greater percentage of the electrostatic diaphragm to contribute directly to the acoustic output without requiring a physically larger panel.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFor the Expression ESL 13A, the result is \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e572 square inches of active radiating area\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e within a relatively slender 13-inch-wide panel.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eClearSpar Reinforcement\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eMartinLogan's transparent \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eClearSpar spacers\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e reinforce the panel while maintaining the precise spacing and diaphragm tension required across its surface.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe narrow transparent structures provide mechanical support without substantially obstructing the radiating area or the characteristic visual transparency of the electrostatic panel.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis becomes increasingly important as panel dimensions increase because maintaining consistent geometry across the entire diaphragm is fundamental to predictable electrostatic operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eAirFrame Blade Construction\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe electrostatic panel is mounted using MartinLogan's \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAirFrame Blade\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, precision manufactured from aerospace-grade extruded aluminum alloy.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe structure is deliberately narrow from the front and considerably deeper when viewed from the side. This geometry creates a rigid structural support without unnecessarily obstructing the panel.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe AirFrame also mechanically separates the electrostatic assembly from the bass enclosure, reducing the transmission of vibration generated by the dynamic woofers into the panel structure.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eDual 10-Inch Aluminum Woofers\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eLow frequencies are generated by \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003etwo 10-inch high-excursion aluminum-cone woofers\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEach driver uses a rigid aluminum diaphragm, cast basket and extended-throw motor system and operates within its own independent sealed enclosure.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe opposed driver arrangement is important because MartinLogan does more than simply use two woofers to increase bass output. Their physical orientation, dedicated amplification and DSP-controlled phase relationship form the basis of PoweredForce Forward technology.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe complete loudspeaker reaches a specified \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e24 Hz at ±3 dB\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003e600 Watts of Internal Bass Amplification Per Speaker\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eEach 10-inch woofer has its own \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e300-watt Class D amplifier\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, providing \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e600 watts of dedicated internal bass amplification in each Expression ESL 13A\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePeak capability is specified at 600 watts per woofer.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe external amplifier therefore does not directly supply the power required to drive the two large dynamic bass drivers. It drives the electrostatic section while the internal amplifier system handles the substantial power requirements of the woofer array.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis allows MartinLogan to optimize the woofer, amplifier and DSP as a complete low-frequency system.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003e24-Bit Vojtko DSP\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe bass system is controlled by a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e24-bit Vojtko Digital Signal Processing engine\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e developed by MartinLogan.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDSP manages the low-pass filters, woofer equalization, phase relationships and limiting functions required by the active bass architecture.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis precise control is particularly important at the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e300 Hz crossover\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, where two fundamentally different transducer technologies must operate as one loudspeaker.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eRather than relying exclusively on passive components to integrate the electrostatic panel with the dynamic bass drivers, MartinLogan can optimize the behavior of the powered woofer system in the digital domain.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003ePoweredForce Forward Bass\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePoweredForce Forward\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e uses the physical arrangement of the two woofers together with DSP-controlled phase relationships to reduce problematic bass energy radiating toward the wall behind the loudspeaker.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBass reflected from the front wall can return toward the listener and interact with the direct output of the speaker, producing peaks and cancellations.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBy controlling the phase relationship between the opposing woofers, MartinLogan reduces this rearward bass energy and creates a more controlled forward launch.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe technology also increases placement flexibility compared with a conventional omnidirectional bass system.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eAnthem Room Correction\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe Expression ESL 13A incorporates \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eAnthem Room Correction compatibility for its powered bass section\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eARC measures the loudspeaker's low-frequency behavior in the actual listening environment and calculates correction filters to address room-induced response problems.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eImportantly, correction is applied to the powered bass system rather than digitizing the signal sent to the electrostatic panel.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe ARC or PBK measurement microphone kit required for calibration is sold separately.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eAdjustable Bass Response\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eTwo physical controls provide additional low-frequency adjustment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eDeep Bass:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ±10 dB below 75 Hz\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eMid-Bass:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e -2 dB \/ 0 dB \/ +2 dB\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThese controls provide useful room and placement compensation without requiring a complete ARC calibration.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe deep-bass control offers substantial adjustment where room gain can have its greatest influence, while the mid-bass control allows finer optimization of the region approaching the electrostatic crossover.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eAdvanced Vojtko Crossover\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe Expression ESL 13A uses MartinLogan's \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eadvanced-topology Vojtko crossover\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e to integrate the electrostatic panel with the active bass system.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIts passive components include a \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003ecustom-wound audio transformer, air-core inductors and polypropylene capacitors\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe electrostatic transducer requires the transformer because it operates at substantially higher voltage than the signal supplied directly by a conventional power amplifier.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe powered bass section combines this passive architecture with dedicated amplification and 24-bit DSP.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eWBT nextgen Binding Posts\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eLoudspeaker-level signal connection is through \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eWBT-0703Cu nextgen 5-way binding posts\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe terminals use gold-plated, nickel-free, non-ferromagnetic pure copper conductors designed to minimize unnecessary conductive mass and eddy-current effects.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThey accommodate substantial loudspeaker cables while providing the mechanical connection expected in a system at this level.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eAmplifier Matching\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe powered bass system substantially reduces the burden placed on the external amplifier, but the XStat electrostatic panel remains a demanding electrical load.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNominal impedance is \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e4 ohms\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, falling to \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e0.7 ohm at 20 kHz\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eMartinLogan's current product specifications recommend amplification from \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e20 to 600 watts per channel\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e and state compatibility with amplifiers rated for 4-, 6- or 8-ohm loudspeakers.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe wattage figure should not be considered in isolation. Stability into the electrostatic load, output-stage design and overall amplifier quality are critical when selecting electronics for the Expression ESL 13A.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2\u003e\u003cspan\u003eTechnical Details\u003c\/span\u003e\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cspan\u003eSpecification\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan\u003eMartinLogan Expression ESL 13A\u003c\/span\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eSeries\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eMasterpiece Series\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eProduct Type\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePowered Hybrid Electrostatic Floorstanding Loudspeaker\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eFrequency Response\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e24 Hz to 23 kHz ±3 dB\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eElectrostatic Transducer\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eXStat CLS\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003ePanel Dimensions\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e44 × 13 in \/ 112 × 33 cm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eRadiating Area\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e572 in² \/ 3,696 cm²\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003ePanel Technology\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eXStat \/ CLS \/ MicroPerf \/ ClearSpar\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003ePanel Structure\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAirFrame Blade\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eHorizontal Dispersion\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e30°\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eVertical Dispersion\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e44 in \/ 112 cm line source\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBass Drivers\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2 × 10 in \/ 25.4 cm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eWoofer Construction\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eRigid aluminum cone\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eWoofer Basket\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eCast\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eWoofer Enclosures\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eIndependent sealed chambers\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBass Technology\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePoweredForce Forward\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eInternal Amplification\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2 × 300 W Class D per speaker\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eInternal Peak Amplification\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2 × 600 W\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBass Processing\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e24-bit Vojtko DSP\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eCrossover Frequency\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e300 Hz\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eRoom Correction\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAnthem Room Correction Ready\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eARC\/PBK Microphone Kit\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eSold separately\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eDeep Bass Adjustment\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e±10 dB below 75 Hz\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eMid-Bass Adjustment\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-2 \/ 0 \/ +2 dB\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eSensitivity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e91 dB \/ 2.83 V \/ 1 m\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eNominal Impedance\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4 Ω\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eImpedance at 20 kHz\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.7 Ω\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eRecommended Amplifier Power\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e20 to 600 W per channel\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eAmplifier Compatibility\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e4 \/ 6 \/ 8 Ω rated amplifiers\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eCrossover Components\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eCustom-wound transformer, air-core coils, polypropylene capacitors\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBinding Posts\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eWBT-0703Cu nextgen 5-way\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eARC Connections\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eRJ45 \/ Mini USB\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eMaximum Power Draw\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e500 W per speaker\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eStandby Power Draw\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u0026lt;1 W per speaker\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eLED Control\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eOn \/ Dim \/ Off\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eHeight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e61.5 in \/ 156.1 cm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eWidth\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e13.4 in \/ 33.9 cm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eDepth\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e27.5 in \/ 69.9 cm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eWeight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e103 lb \/ 46.8 kg each\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003e\u003cspan\u003eMartinLogan Expression ESL 13A at The Grid HiFi\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThe Grid HiFi in Houston specializes in \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eMartinLogan electrostatic loudspeakers and complete high-end two-channel systems\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Expression ESL 13A benefits enormously from proper system design. Its \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e0.7-ohm high-frequency impedance, powered dual-woofer architecture and dipole electrostatic radiation\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e make amplifier selection, speaker positioning and bass integration important parts of the final result.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWe can match the Expression ESL 13A with appropriate amplification, optimize its PoweredForce Forward bass system, perform ARC calibration and establish the panel position and toe-in around the listening room.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Grid can also design the complete system, including digital and analog sources, amplification, cabling, power infrastructure, equipment support, networking and final system calibration.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eComplimentary White Glove Delivery • Travel Reimbursement*\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eQualifying purchasers may receive airfare reimbursement for your private audition.\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003cspan\u003eConsidering the Expression ESL 13A? Experience it properly before you decide. Call The Grid HiFi at (713) 218-8120 to arrange your private consultation.\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\u003cem\u003e\u003cspan\u003e*Restrictions apply. Contact us for details.\u003c\/span\u003e\u003c\/em\u003e\u003c\/p\u003e","brand":"MartinLogan","offers":[{"title":"Gloss Black","offer_id":55150686470481,"sku":null,"price":17999.98,"currency_code":"USD","in_stock":true},{"title":"Walnut","offer_id":55150686503249,"sku":null,"price":17999.98,"currency_code":"USD","in_stock":true},{"title":"Cherry","offer_id":55150686536017,"sku":null,"price":17999.98,"currency_code":"USD","in_stock":true},{"title":"Arctic Silver","offer_id":55150686568785,"sku":null,"price":17999.98,"currency_code":"USD","in_stock":true},{"title":"Desert Silver","offer_id":55150686601553,"sku":null,"price":17999.98,"currency_code":"USD","in_stock":true},{"title":"Meteor Grey","offer_id":55150686634321,"sku":null,"price":17999.98,"currency_code":"USD","in_stock":true},{"title":"Rosso Fuoco","offer_id":55150686667089,"sku":null,"price":17999.98,"currency_code":"USD","in_stock":true},{"title":"Cordoba Red","offer_id":55150686699857,"sku":null,"price":17999.98,"currency_code":"USD","in_stock":true},{"title":"Deep See Blue","offer_id":55150686732625,"sku":null,"price":17999.98,"currency_code":"USD","in_stock":true},{"title":"Basalt Black","offer_id":55150686765393,"sku":null,"price":17999.98,"currency_code":"USD","in_stock":true},{"title":"Gloss White","offer_id":55150709965137,"sku":null,"price":17999.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1047\/7178\/0945\/files\/48529190322_80ca7a5454_b.jpg?v=1790910363","url":"https:\/\/gridhifi.com\/products\/martinlogan-expression-esl-13a","provider":"The Grid","version":"1.0","type":"link"}