Introduction to the KS28 Subwoofer

The KS28 is a high-performance subwoofer from L-Acoustics, designed for large-scale live sound and fixed installations. It delivers deep, powerful bass with exceptional clarity, making it a staple in concert touring and premium venues. In this guide, we cover its specifications, ideal applications, and what to consider when buying used.

Key Specifications and Performance

The KS28 is a dual 18-inch subwoofer capable of producing high SPL levels with low distortion. It features a bass-reflex design and is optimized for both ground-stacked and flown configurations. Key specs include:

  • Frequency Response: 25 Hz – 100 Hz
  • Max SPL: 143 dB
  • Components: 2 × 18" neodymium drivers
  • Impedance: 2 × 8 ohms
  • Weight: 101 kg (223 lbs)

Its advanced transducer design and cabinet tuning ensure tight, accurate low-end reproduction, even at high volumes.

Applications: Where the KS28 Excels

The KS28 is engineered for demanding environments. Common applications include:

  • Concert Touring: Paired with L-Acoustics line arrays like K1 or K2 for full-range sound.
  • Festivals and Outdoor Events: Delivers consistent coverage in open-air settings.
  • Clubs and Live Venues: Provides chest-thumping bass for electronic music and rock.
  • Houses of Worship: Enhances audio for contemporary services.
  • Theatres and Performing Arts Centers: Supports immersive sound designs.

Its versatility makes it a go-to choice for AV integrators and rental companies.

KS28 vs. Other Subwoofers

Compared to other L-Acoustics models like the KS21 or SB28, the KS28 offers higher output and deeper extension. It is often chosen when maximum low-frequency impact is required. For smaller venues, the KS21 may be more appropriate, while the KS28 shines in large-scale applications.

Buying Used KS28 Subwoofers

Purchasing used KS28 subwoofers can be a cost-effective way to access premium sound. However, it's crucial to buy from a reputable dealer that tests and certifies equipment. At Acoustrade, we offer tested used KS28 subwoofers alongside a wide range of pro audio amplifiers, speakers, line arrays, mixers, and microphones. Our inventory is inspected for performance and reliability, ensuring you get professional-grade gear at a fraction of the new price.

FAQ

1. What is the KS28 subwoofer best used for?

The KS28 is ideal for large-scale live sound reinforcement, including concert touring, festivals, and high-end installations where deep, powerful bass is essential.

2. How much does a used KS28 subwoofer cost?

Prices vary based on condition and age. Generally, used KS28 subwoofers cost 30-50% less than new. Check Acoustrade for current listings and competitive pricing.

3. Can the KS28 be flown?

Yes, the KS28 is designed for both ground-stacked and flown configurations using appropriate rigging hardware.

4. What amplifier is recommended for the KS28?

L-Acoustics recommends their LA series amplifiers (e.g., LA12X) for optimal performance. Ensure proper presets are used.

5. Is it safe to buy used pro audio equipment?

Yes, when purchased from a trusted dealer like Acoustrade that tests and guarantees the equipment. We provide detailed condition reports and support.