What Is the L-Acoustics KS28?
The L-Acoustics KS28 is a high-power, flyable subwoofer from the French manufacturer's K Series. It is designed for large-scale touring, stadium shows, festivals, and premium fixed installations where deep, controlled low-frequency energy is required.
Unlike many subwoofers, the KS28 can be flown in arrays or ground-stacked, giving system designers flexibility in coverage and rigging. It is typically paired with K1 or K2 main arrays to extend low-end response.
Key Specifications
- Configuration: Dual 18-inch direct-radiating subwoofer
- Frequency range: Approximately 25 Hz to 100 Hz (depending on preset)
- Maximum SPL: High output, suitable for large venues
- Impedance: 2 x 8 ohms (per driver)
- Rigging: Integrated flyware for array deployment
- Weight: Around 100 kg per cabinet
These figures are based on manufacturer data and may vary with presets and amplifiers.
Common Applications
- Touring and festivals: Delivers consistent sub-bass for audiences of thousands.
- Stadium and arena shows: Flown arrays cover large areas evenly.
- Fixed installations: Nightclubs, concert halls, and houses of worship with high SPL needs.
- Corporate and EDM events: Tight, punchy low-end for electronic music.
Why Buy Used L-Acoustics KS28?
New KS28 cabinets are a significant investment. For many integrators and venue owners, tested used L-Acoustics KS28 units offer a more accessible path to premium sound.
Benefits of buying second-hand:
- Lower upfront cost: Typically 30–50% less than new, depending on condition and age.
- Proven performance: The KS28 is a mature, well-documented design.
- Fleet expansion: Add to an existing L-Acoustics inventory without breaking budget.
- Availability: Used stock is often ready to ship immediately.
At Acoustrade, every used subwoofer is inspected, tested, and graded before listing. We supply used amplifiers, speakers, line arrays, mixers, and microphones to venues and rental companies worldwide.
What to Check Before Buying
When evaluating a used KS28, ask these questions:
1. Driver condition: Are the 18-inch drivers original or reconed? Any rub or distortion?
2. Cabinet integrity: Any cracks, water damage, or previous repairs?
3. Rigging hardware: Are flyware and pins complete and functional?
4. Grille and finish: Cosmetic wear is normal, but structural damage is not.
5. Test report: Request frequency sweep and impedance measurements.
6. Compatibility: Confirm it matches your existing presets and amplifier platform.
A reputable seller will provide test data and clear photos.
Amplification and Processing
The KS28 is designed to work with L-Acoustics amplified controllers (LA series) and presets. If you are building a mixed system, ensure your amplifier platform supports the correct presets. Acoustrade also stocks used amplifiers compatible with L-Acoustics systems.
FAQ
Q: Can the KS28 be flown?
A: Yes. The KS28 has integrated rigging hardware and can be flown in arrays or ground-stacked.
Q: What is the difference between KS28 and KS21?
A: The KS28 uses dual 18-inch drivers for higher output and lower extension, while the KS21 is a single 21-inch design. The KS28 is typically chosen for larger venues.
Q: How much does a used KS28 cost?
A: Pricing depends on condition, age, and quantity. Contact Acoustrade for a current quote.
Q: Does Acoustrade ship internationally?
A: Yes. We ship tested used pro audio equipment worldwide.
Q: What amplifier do I need for the KS28?
A: L-Acoustics amplified controllers with the correct presets are recommended. We can advise on compatible used amplifiers.
