Wisdom Audio Wisdom Series LS4i

Reference In-Wall Line-Source Loudspeaker | The Grid HiFi

80 Inches of Planar Magnetic Performance

The Wisdom Audio Wisdom Series LS4i is a reference-level in-wall loudspeaker engineered for large private cinemas, dedicated listening rooms, and installations demanding exceptional output without visible freestanding speakers.

Its defining feature is a single, 80-inch two-way planar magnetic line source. Wisdom Audio rates the LS4i for sound pressure levels exceeding 130 dB at 12 feet, combining substantial dynamic capability with the controlled dispersion of its extended driver.

With 100 dB sensitivity and an architectural enclosure designed for installation behind an acoustically transparent screen, the LS4i brings reference-scale sound to a room designed around the listening experience.

A Single 80-Inch Planar Magnetic Driver

The LS4i employs one continuous 80-inch planar magnetic driver using a lightweight PEEK-film diaphragm.

Its two-way design covers a frequency range of 80 Hz to 20 kHz, with the planar magnetic architecture spanning eight octaves according to Wisdom Audio.

The extended diaphragm is designed for rapid acceleration, low distortion, and detailed reproduction across a broad range of musical and cinematic material.

Unlike a conventional loudspeaker assembled around multiple cone drivers, the LS4i uses its tall radiating surface to establish a consistent line-source presentation.

Controlled Dispersion for Large Listening Spaces

The LS4i's line-source architecture is designed to reduce unwanted floor and ceiling reflections while distributing sound across the width of the listening area.

Its extended vertical radiating surface also helps maintain sound levels over distance.

These characteristics make the LS4i particularly relevant to large private cinemas with multiple seating rows, as well as expansive listening spaces where consistent coverage is an important design consideration.

Wisdom Audio specifies maximum output exceeding 130 dB at 12 feet, making the LS4i a substantial option for demanding reference systems.

Two-Way Active Architecture

The LS4i requires two amplifier channels per loudspeaker, an external active crossover, and digital signal processing.

Its tweeter and midrange/bass sections each present a nominal impedance of 4.25 ohms.

This architecture allows the two sections to be driven and calibrated independently, with crossover behavior, equalization, and level matching established during system commissioning.

The LS4i is not a conventional passive loudspeaker intended for connection to a single amplifier channel. Proper amplification and DSP configuration are essential to the installation.

Designed for Architectural Integration

At 84.75 inches tall, the LS4i is intended to become part of the room's architecture.

Its in-wall construction makes it particularly suitable for installation behind an acoustically transparent projection screen, where the front soundstage can be positioned in direct relationship to the picture.

Wisdom Audio also offers the LS4m on-wall model and LS4 freestanding model for installations with different architectural requirements.

The LS4i can also be stacked, providing additional flexibility for specialized projects.

Key Features

• Single 80-inch planar magnetic line-source driver

• Two-way planar magnetic architecture

• Lightweight PEEK-film diaphragm

• Manufacturer-rated output exceeding 130 dB at 12 feet

• 100 dB sensitivity

• 80 Hz–20 kHz frequency response

• Controlled vertical dispersion

• In-wall architectural installation

• Suitable for main or surround applications

• External active crossover and DSP required

• Two amplifier channels required per loudspeaker

• Stackable configuration supported

• Related on-wall LS4m and freestanding LS4 models available

Technical Specifications

Installation considerations: The LS4i is a substantial architectural loudspeaker, measuring more than seven feet tall and carrying a published shipping weight of 425 pounds. Structural requirements, mounting provisions, service access, and installation clearances should be confirmed against Wisdom Audio's LS4i drawings before construction.

Design Your Wisdom Audio System at The Grid HiFi

The Wisdom Series LS4i is designed for projects where loudspeaker performance and architectural planning are developed together.

At The Grid HiFi in Houston, we design complete private cinemas and reference listening environments, coordinating speaker placement, amplification, DSP, surround processing, acoustic treatment, and calibration.

For an LS4i installation, we'll evaluate the room dimensions, screen configuration, seating arrangement, structural requirements, and appropriate electronics before developing the complete system.

From initial design through installation and final calibration, our goal is to make the loudspeaker system work as part of the room—not as an afterthought.

Contact The Grid HiFi to design your Wisdom Audio reference system.