What Is the L-Acoustics KS28 Subwoofer?

The L-Acoustics KS28 is a dual-18-inch, high-power subwoofer designed for large-scale touring and fixed installations. It is part of the L-Acoustics K Series ecosystem, typically paired with K1 or K2 line arrays to deliver deep, controlled low-frequency energy in stadiums, arenas, festivals, and large concert halls.

The KS28 is known for its high SPL output, cardioid-capable configurations, and compatibility with L-Acoustics amplified controllers and prediction software. It is a common choice for rental companies and integrators who need reliable, rider-friendly subwoofers.

Key Specifications and Design Features

While exact performance depends on configuration and processing, the KS28 is built around these core design traits:

  • Two 18-inch transducers in a bass-reflex enclosure for high output and low distortion.
  • High SPL capability suitable for large venues and outdoor events.
  • Cardioid or end-fire array configurations to control low-frequency directivity and reduce stage bleed.
  • Rigging and stacking options compatible with K Series flying hardware and ground-stack accessories.
  • Integration with L-Acoustics LA amplified controllers and Soundvision for system design.

For accurate, current specifications, always refer to official L-Acoustics documentation, as product revisions and processing presets can change over time.

Typical Applications

KS28 subwoofers are most often deployed in:

  • Touring sound systems for rock, pop, and electronic music, where low-end impact is critical.
  • Festival main stages and delay systems requiring long throw and high headroom.
  • Arenas and stadiums with complex coverage and strict noise-control requirements.
  • Large fixed installations such as concert halls, clubs, and houses of worship with high-output needs.

Because the KS28 is part of the K Series, it integrates naturally with K1, K2, and related L-Acoustics loudspeakers, making it a logical choice for existing L-Acoustics inventories.

Used vs. New: What to Consider

Buying used L-Acoustics KS28 subwoofers can be a cost-effective way to expand an existing system or build a new one without paying full new pricing. However, condition and history matter a great deal:

  • Driver condition: Check for reconing history, coil damage, or signs of over-excursion.
  • Enclosure integrity: Look for water damage, cracked cabinets, or compromised rigging points.
  • Grille and hardware: Ensure grilles, handles, and rigging components are intact and original where possible.
  • Documentation: Ask for service records, usage history, and any available test data.
  • Compatibility: Confirm the units match your amplifier and processing platform.

Acoustrade supplies tested used pro-audio equipment, including subwoofers, line arrays, amplifiers, mixers, and microphones. If you are sourcing KS28 units, it helps to work with a supplier that can provide clear condition reports and test results.

How to Deploy KS28 Subwoofers Effectively

Getting the most from KS28 subwoofers is as much about system design as it is about the boxes themselves:

  • Use prediction software to model subwoofer arrays and coverage before the event.
  • Choose the right array type (cardioid, end-fire, or broadside) based on stage layout and noise limits.
  • Match amplifier channels and presets to the KS28 to ensure correct processing and protection.
  • Plan power and rigging early, as subwoofer arrays can be heavy and power-hungry.
  • Consider ground-stacking vs. flying based on venue constraints and sightlines.

For integrators, pairing KS28 subs with the right line array and amplifier selection is essential for consistent results across venues.

FAQ

Q: What is the L-Acoustics KS28 used for?
A: It is a high-output subwoofer used in large touring and installed sound systems, typically with K1 or K2 line arrays, to deliver deep low-frequency energy in arenas, stadiums, festivals, and large venues.

Q: Can I buy used L-Acoustics KS28 subwoofers?
A: Yes. Used KS28 units are available through specialist suppliers. When buying used, check driver condition, enclosure integrity, rigging hardware, and service history, and ask for test data where possible.

Q: What should I check before buying a used KS28?
A: Inspect the drivers for reconing or damage, verify the cabinet and rigging points are sound, confirm compatibility with your amplifiers and processing, and request documentation or test results.

Q: Is the KS28 compatible with K1 and K2 systems?
A: Yes. The KS28 is part of the L-Acoustics K Series ecosystem and is commonly used with K1 and K2 line arrays, as well as other L-Acoustics loudspeakers, when designed and processed correctly.

Q: Where can I find KS28 subwoofers and related equipment?
A: Acoustrade supplies tested used pro-audio gear, including subwoofers, line arrays, amplifiers, mixers, and microphones, for touring and installation projects worldwide.