Line Sources


Available in freestanding, on-wall, and in-wall versions

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Our namesake Wisdom Series is the latest planar magnetic thin-film technology and represents an uncompromised engineering effort to achieve the ultimate in music and film sound reproduction.

The LS4i shares the high efficiency, ultra high output planar magnetic modules used in the LS4 and LS4m, but trades its beautiful exterior appearances for designs specifically suited for installation and use behind acoustically transparent screens or decorative fabric.

Reproducing more of the music through our advanced thin-film technology than any previous models, including Wisdom Audio's highly regarded legacy models, all Wisdom Series models yield breathtaking performance including low distortion, detail, dynamic range, transparency, horizontal dispersion, sound stage imaging and maximum output capability.

The LS4 models are the tallest line sources produced by Wisdom Audio. Incorporating true line sources of this length is unprecedented among architectural speakers. Since true line sources effectively eliminate deleterious floor and ceiling reflections, they are ideal for large rooms or those with architectural challenges including cathedral or coffered ceilings, hard floors, etc. True line source speakers also exhibit less propagation loss than any other type of loudspeaker, resulting in a vastly enlarged "sweet spot" that is particularly beneficial in any situation with a large listening area. Whether in a large multi-use space, media room with a casual seating arrangement or dedicated home theaters with multiple rows of seating, everyone in the audience is treated to "money seat" performance. For very large theaters with stadium seating, additional LS4i cabinets may be stacked to create both a taller line source and higher sound pressure level capability. Yet because of the continuous nature of the advanced thin-film line source design, the lobing and comb filter anomalies of multiple-driver line arrays simply do not exist.

The LS4 models consist of four two-way planar magnetic transducer modules each incorporating discrete low frequency and high frequency radiating areas. Within each transducer module, the low frequency radiating area is comprised of two sections, each reproducing the range from 80 Hz to 750 Hz. The low frequency radiating area of a single LS4(i) is equivalent to 11 twelve-inch moving coil woofers. The vertically oriented high frequency radiating area is positioned in the center of the module, between the flanking low frequency transducers, covers the range from 750 Hz to beyond 20 kHz and is equivalent to the radiating area of 96 one-inch dome tweeters. This extraordinary measure of surface area allows for minimal movement to achieve a given sound pressure level, inherently reducing distortion at all frequencies.

The LS4 models establish a new benchmark for overall system sensitivity in the planar magnetic, thin-film category, matching or exceeding the capabilities of professional audio speaker systems at typical listening distances. A single LS4(i) has a sensitivity of 100 dB for 2.83 volts input and is capable of reproducing sound pressure levels in excess of 130 dB at 4 meters. The tall line source driver complement allows for ultra-high resolution, low distortion and extraordinary dynamic range. The result is remarkable detail, life-like dynamics, and a genuinely effortless performance at any volume level.

To achieve the LS4's remarkable sensitivity, each planar magnetic module employs a powerful magnetic field based on a combination of ceramic and neodymium magnets acting upon an ultra-low mass film. Within each LS4(i) a total of 2376 discrete magnets with a cumulative linear length of 396 feet (121 meters) are used. Assembly of these steel and aluminum modules using opposing magnetic fields is challenging, requiring particular expertise along with a twelve-ton press to mate the two sections of the module to each other. The resulting transducer module assembly weighs in excess of 28 pounds (12.7 kilograms) and is the most sensitive thin-film transducer assembly ever developed for domestic use.

To optimize the performance of this latest generation planar magnetic transducer and avoid compromise in performance, the LS4(i) is a biamplified design, eliminating any passive components in the signal path. This yields lower distortion, greater efficiency and more accurate filtering between sections, providing direct connection between the selected amplifier and our purely resistive thin-film transducers, resulting in outstanding control of their diaphragms and any amplifier to perform at its best. The LS4(i) is a landmark achievement, offering a level of performance that can simultaneously satisfy both the most critical music and film aficionados.

LS4 Specifications
All specifications are subject to change at any time, in order to improve the product.

Frequency response 80Hz – 20kHz ± 2dB relative to the target curve
Frequency response, 30° off horizontal axis Coming Soon
LS4: 4.25 ohms
LS4: 4.25 ohms
Sensitivity Ls4: 100 dB / 2.83 V / 1m
Shipping weight LS4: 550 lbs. (250 kg)
LS4i: 425 lbs. (193 kg)


LS4 .dwg, .dxf, pdf
LS4i .dwg, .dxf, pdf
To view the CAD drawings above, download SolidWorks eDrawings here.

All Model Dimensions

Owner's Manual

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