BST AD4900 - 4-Channel Class-D Digital Power Amplifier

BST AD4900 - 4-Channel Class-D Digital Power Amplifier

The BST AD4900 is a high-performance digital power amplifier designed for professional touring, fixed installation, and studio applications. It features four independent channels, configurable in stereo mode or 2x2 bridged for double power across two outputs. Thanks to its Class D design with a switching power supply and progressive air cooling, it offers high efficiency while weighing just 6.6 kg and measuring 1 U in a 19″ rack. It incorporates protection circuitry against overheating, VHF, short circuits, soft start, and an internal limiter, ensuring maximum reliability in demanding environments. Its balanced XLR inputs, parallel XLR outputs, and turnlock speaker connectors facilitate integration with professional equipment.

Main features

• 4 Class D digital channels, bridgeable 2 × 2
• RMS Power:
  • 4× 600 W at 8 Ω
  • 4× 1100 W at 4 Ω
  • 2× 2200 W at 8 Ω (bridged mode)
• Frequency response: 20 Hz – 20 kHz
• Signal-to-noise ratio: > 102 dB; Damping factor: > 250
• Inputs: 4× balanced XLR
• Parallel outputs: 4× XLR
• Speaker Outputs: 4× Turnlock
• Internal limiter and multiple protections: overheating, VHF, short circuit, soft start, continuous operation
• Cooling: progressive air system with intelligent fans
• Power supply: high-efficiency switching power supply
• 19″ 1U rack format – Dimensions: 485 × 285 × 88 mm; Weight: 6.6 kg

Product benefits

• Energy efficiency: Class D and switching power supply reduce consumption and heat generated.
• High reliability: Protection circuits ensure continuous operation without interruptions.
• Configuration flexibility: Stereo or 2 × 2 bridged mode depending on power needs.
• Professional Integration: XLR and Turnlock connectivity for compatibility with all types of systems.
• Portability and space: 1U rack size and 6.6kg make it easy to transport and fit into road cases.

Use cases

• Tours and concerts where high power is required in a compact setup.
• Fixed installations in auditoriums, churches and convention centers.
• Recording and broadcast studios that require reliable and silent power.
• Corporate event rooms and professional equipment rental.

Frequently Asked Questions

• Can I use it in stereo and bridged mode at the same time?
  No, you must choose between stereo outputs on 4 channels or bridged outputs on 2 channels for greater power.
• What type of speakers does it support?
  Any professional speaker compatible with Turnlock and 4 Ω–8 Ω connections.
• Do you need additional ventilation?
  Its progressive air system is sufficient, but it must be rack mounted with at least 1 U of separation.
• How do I activate the limiter?
  The limiter is always active; it does not require manual adjustment.

Description for projects

4-channel bridgeable Class D digital amplifier 2 × 2, 4× 600 W@8 Ω, 4× 1100 W@4 Ω, 2× 2200 W@8 Ω bridged, XLR inputs, parallel XLR and Turnlock outputs, limiter and protections, air cooling, 1 U rack, 6.6 kg.