What Is the KS28 Subwoofer?

The KS28 is a high-power, large-format subwoofer designed for professional sound reinforcement. It is part of the L-Acoustics line of loudspeakers and is widely used in live concerts, festivals, clubs, and large installed systems where deep, powerful low-frequency extension is required. The KS28 is known for its cardioid-capable configuration, which helps control low-frequency dispersion and reduce stage noise.

If you are an AV integrator, venue owner, or rental company, understanding the KS28's capabilities helps you specify the right subwoofer for your project. Acoustrade supplies tested used KS28 subwoofers and other pro-audio equipment to buyers worldwide.

Key Specifications and Performance

The KS28 is a dual 18-inch subwoofer with a high-power handling capacity. While exact specifications should always be confirmed with the manufacturer's official documentation, typical characteristics include:

  • Driver configuration: Two 18-inch neodymium drivers.
  • Frequency response: Extended low-frequency output, typically down to the low 30s Hz range.
  • Power handling: High continuous and peak power ratings suitable for large venues.
  • Cardioid capability: Can be deployed in cardioid arrays to reduce low-end spill on stage.
  • Rigging: Compatible with L-Acoustics rigging systems for flown or ground-stacked arrays.

These features make the KS28 a popular choice for touring and fixed installations alike.

Where the KS28 Subwoofer Is Used

The KS28 is designed for applications that demand high SPL and deep bass. Common uses include:

  • Live music venues and concert halls: Provides the low-frequency foundation for rock, pop, and electronic music.
  • Festivals and outdoor stages: High output and cardioid options help manage sound in open environments.
  • Nightclubs and bars: Delivers the physical impact needed for dance music.
  • Houses of worship and auditoriums: Supports speech and music with controlled low-end.
  • KTV and entertainment rooms: When paired with appropriate amplifiers and processors, it can enhance the experience in high-end KTV systems.

Acoustrade also supplies related categories such as line array systems, power amplifiers, and speakers to complete your sound system.

Buying Used KS28 Subwoofers: What to Check

Purchasing used professional subwoofers can be a cost-effective way to equip a venue. Here are key points to verify:

  • Driver condition: Check for original cones, proper suspension, and no voice coil rub.
  • Cabinet integrity: Look for cracks, water damage, or poorly repaired corners.
  • Grille and connectors: Ensure SpeakON or other connectors are intact and not corroded.
  • Rigging hardware: Confirm all rigging points and hardware are present and functional.
  • Testing: Ask for test reports or arrange a demo to confirm output and cardioid performance.

Acoustrade tests used equipment before sale and provides detailed condition information. Browse our subwoofers category for current stock.

Pairing the KS28 with Amplifiers and Processors

To get the best from the KS28, pair it with appropriate amplification and processing. L-Acoustics recommends specific amplified controllers with factory presets. When buying used, ensure the amplifier is compatible and has the correct presets loaded.

Acoustrade offers a range of used amplifiers and signal processors that can be matched to your subwoofer system. Always follow the manufacturer's guidelines for power and processing.

FAQ

Q: What is the difference between the KS28 and other subwoofers?
A: The KS28 is a large-format, high-power subwoofer with cardioid capability, designed for professional live sound and installation. It offers deep low-frequency extension and high SPL.

Q: Can I use the KS28 in a small venue?
A: Yes, but its high output may be more than needed. In smaller rooms, you may need to limit SPL and consider acoustic treatment. It is often used in medium to large venues.

Q: How many KS28 subwoofers do I need?
A: The number depends on venue size, desired SPL, and music genre. A common starting point is one subwoofer per two top boxes, but always consult a system designer.

Q: Does Acoustrade ship internationally?
A: Yes, Acoustrade supplies equipment to buyers worldwide. Contact us for shipping details and lead times.

Q: Are used KS28 subwoofers reliable?
A: When sourced from a reputable supplier that tests equipment, used KS28 subwoofers can be reliable and cost-effective. Always request test reports and condition details.