L-Acoustics K3 Line Source Array — Perfect Condition

L-Acoustics K3 Line Array

The L-Acoustics K3 line array is a compact, full-range professional loudspeaker designed for demanding live sound, touring, concert, festival and event applications. Part of the L-Acoustics K Series, K3 combines a dual 12-inch low-frequency section with a 4-inch high-frequency compression driver in a 2-way active WST enclosure.

Designed as a variable-curvature line source, the L-Acoustics K3 provides long-throw performance, integrated rigging and adjustable horizontal directivity through L-Acoustics Panflex technology.

The K3 delivers a manufacturer-specified maximum SPL of 143 dB and a usable bandwidth of 42 Hz to 20 kHz with the K3 70 preset. It weighs 43 kg / 95 lb, making it a relatively compact solution for professional line source applications where high output and transport efficiency are important. 

L-Acoustics K3 Overview

The K3 was introduced as a compact full-range member of the L-Acoustics K Series, positioned between the KARA II and K2 product families.

Its dual 12-inch configuration provides substantial low-frequency capability while maintaining a compact enclosure format. L-Acoustics describes K3 as a full-range line source designed for mid-size events, with the manufacturer’s published material identifying applications covering audiences from approximately 1,000 to 10,000 people when deployed appropriately. 

The K3 combines several L-Acoustics technologies, including:
• Wavefront Sculpture Technology
• DOSC waveguide
• Panflex adjustable directivity
• L-Vents
• Variable-curvature line source design
• Integrated 4-point rigging system

These technologies allow K3 arrays to be configured according to venue geometry, audience coverage requirements and desired vertical curvature.

L-Acoustics K3 Key Features
• 2-way active WST enclosure
• Dual 12-inch LF transducers
• 1 x 4-inch HF compression driver
• Variable-curvature line source
• Maximum SPL of 143 dB
• Usable bandwidth of 42 Hz to 20 kHz
• Panflex adjustable horizontal directivity
• 70°, 90° and 110° horizontal configurations
• 10° nominal vertical directivity per enclosure
• DOSC waveguide
• L-Vents
• 4-point integrated rigging system
• Multiple inter-enclosure angles
• 43 kg / 95 lb net weight
• Baltic birch plywood cabinet
• IP55 rating
• Compatible with LA4X, LA8 and LA12X amplified controllers 

K3 Dual 12-Inch Line Array Design

The K3 uses two 12-inch neodymium cone drivers for low-frequency reproduction and a 4-inch neodymium diaphragm compression driver for high frequencies.

The LF section uses a bass-reflex acoustic load incorporating L-Vents, while the HF section uses the DOSC waveguide.

The combination provides a compact enclosure capable of delivering the bandwidth and output required for professional sound reinforcement.

The K3’s active 2-way design means the loudspeaker requires an appropriate L-Acoustics amplified controller for operation rather than functioning as a conventional passive loudspeaker. L-Acoustics specifies the LA4X, LA8 and LA12X as compatible amplified controllers. 

K3 Frequency Response and Maximum SPL

The L-Acoustics K3 has a specified usable bandwidth of:

42 Hz to 20 kHz (-10 dB)

using the K3 70 configuration.

The manufacturer specifies maximum SPL of:

143 dB

The published maximum SPL figure is a peak measurement at 1 metre under free-field conditions using pink noise with a crest factor of 4 and the specified preset. 

This makes K3 particularly suitable for professional applications where high acoustic output and extended bandwidth are required from a relatively compact line source enclosure.

Panflex Adjustable Directivity

One of the defining features of the L-Acoustics K3 line array is Panflex.

Panflex uses adjustable fins to provide different horizontal coverage options. K3 supports 70°, 90° and 110° horizontal directivity, with the 90° configuration available as asymmetric directivity according to the manufacturer’s specifications.

This allows the system designer to adapt horizontal coverage to the shape and requirements of a venue.

For example, a narrower horizontal pattern can be appropriate where more controlled coverage is required, while a wider configuration can provide greater horizontal audience coverage.

The vertical directivity of an assembled K3 array depends on the number of elements and the curvature of the array rather than being fixed by an individual enclosure. 

DOSC Waveguide and WST Technology

The K3 incorporates L-Acoustics’ DOSC waveguide and Wavefront Sculpture Technology.

WST is central to the design philosophy behind L-Acoustics line source systems. The technology is intended to allow multiple enclosures to operate coherently when configured as an appropriate line source array.

The DOSC waveguide forms part of the high-frequency section of the K3, while the variable-curvature mechanical design allows the array to be shaped according to coverage requirements.

L-Vents Technology

The K3 also incorporates L-Acoustics L-Vents technology.

The L-Vent design is used in the low-frequency section to manage airflow and reduce turbulence-related noise.

L-Acoustics states that its laminar venting technology was introduced with the SB28 and is used across current L-Acoustics loudspeaker enclosures featuring low-frequency capabilities. 

K3 Rigging System

The K3 is designed for professional touring and event production with an integrated 4-point rigging system.

Inter-enclosure angles can be configured at:
• 0.25°
• 1°
• 2°
• 3°
• 4°
• 5°
• 7.5°
• 10°

These adjustment options allow the vertical curvature of a K3 array to be configured according to the intended audience coverage.

The enclosure incorporates two handles and flush-fitting rigging hardware designed for professional handling and deployment. 

L-Acoustics K3 Amplification

The K3 is designed to operate with L-Acoustics amplified controllers.

Compatible controllers specified by L-Acoustics include:
• LA4X
• LA8
• LA12X

The appropriate controller and preset configuration should be selected according to the specific K3 deployment and system design. 

For larger professional systems, the LA12X provides higher available output capability than the LA4X and LA8. Current L-Acoustics documentation lists the maximum output capability of the LA12X as 4 x 1,400 W at 8 ohms, 4 x 2,600 W at 4 ohms and 4 x 3,300 W at 2.7 ohms under its specified test conditions. 

K3 Dimensions and Weight

The L-Acoustics K3 measures:

950 mm x 357 mm x 403 mm

or approximately:

37.4 x 14 x 15.9 inches

The net weight is:

43 kg / 95 lb

The cabinet is constructed from premium-grade Baltic birch plywood, with a coated steel grille and acoustically neutral 3D fabric on the front.

The integrated rigging components use high-grade steel with an anti-corrosion coating. 

K3 Professional Applications

The L-Acoustics K3 is designed for professional sound reinforcement applications including:
• Concerts
• Touring productions
• Festivals
• Corporate events
• Outdoor events
• Indoor events
• Live music venues
• Rental production
• Large event production
• Professional PA systems
• Touring sound companies

L-Acoustics positions K3 as a solution for mid-size events and venues, while its compact format also allows it to be incorporated into larger systems alongside other K Series products. 

K3 and KS28 Subwoofer Systems

K3 can be deployed as part of a larger L-Acoustics system with compatible subwoofers.

The L-Acoustics preset documentation lists K3 line source configurations with KS28 or KS21 subwoofers. With compatible subwoofer configurations, the overall system can extend low-frequency reproduction below the K3’s standalone operating bandwidth. 

For applications requiring significant low-frequency output, pairing K3 with KS28 can create a scalable system suitable for professional concert, festival and touring applications.

K3 for Touring and Rental Companies

For professional rental companies, the K3 offers a combination of high output, compact dimensions and integrated rigging.

At 43 kg per enclosure, K3 requires appropriate handling and transportation equipment, but its compact enclosure format can help simplify deployment compared with larger-format line source systems.

The integrated rigging system also allows multiple K3 elements to be assembled into arrays with precise inter-enclosure angles.

This makes the system suitable for production companies that regularly deploy scalable line source systems across different venues and event sizes.

K3 Line Array for Sale

If you are looking for an L-Acoustics K3 line array for professional touring, rental, concert or event production, contact us for current availability, condition, quantity and pricing.

K3 systems can be supplied according to available inventory, with associated accessories and compatible system components depending on stock.

For buyers building a complete L-Acoustics system, K3 can also be combined with compatible subwoofers, amplified controllers, rigging equipment and transport solutions.

Contact us for current L-Acoustics K3 availability and pricing.

Frequently Asked Questions About L-Acoustics K3

What is the L-Acoustics K3?

The L-Acoustics K3 is a 2-way active, dual 12-inch variable-curvature WST line source enclosure designed for professional sound reinforcement. 

How loud is the L-Acoustics K3?

L-Acoustics specifies a maximum SPL of 143 dB for K3 under the manufacturer’s stated measurement conditions. 

What is the frequency response of K3?

The specified usable bandwidth is 42 Hz to 20 kHz (-10 dB) using the K3 70 configuration. 

How many speakers are inside a K3?

Each K3 enclosure contains two 12-inch LF transducers and one 4-inch HF compression driver. 

What amplifiers power L-Acoustics K3?

L-Acoustics specifies the LA4X, LA8 and LA12X amplified controllers for K3. 

What is the weight of an L-Acoustics K3?

The K3 weighs approximately 43 kg / 95 lb. 

What directivity options does K3 have?

K3 provides adjustable horizontal directivity of 70°, 90° and 110° through Panflex. The 90° configuration is asymmetric, while 70° and 110° are symmetric. 

Is K3 a line array speaker?

L-Acoustics identifies K3 as a variable-curvature line source and a full-range WST enclosure. Multiple K3 elements can be deployed together as a line source array. 

Can K3 be used with KS28?

Yes. Current L-Acoustics preset documentation includes K3 line source configurations with KS28 and KS21 subwoofers. 

Is K3 suitable for outdoor events?

K3 has an IP55 rating according to the current manufacturer’s specifications. Appropriate system deployment, weather protection and operating conditions should still be considered for outdoor use.