AF Dual Transformer 4-Channel Professional Power Amplifier Series

The AF Dual Transformer Professional Power Amplifier Series is developed for demanding professional sound reinforcement applications requiring exceptional power reserves, stable performance and outstanding reliability. Equipped with an independent dual-transformer power supply, the series delivers stronger current capability, improved channel separation and enhanced stability under continuous heavy loads.

Available in AF409 and AF411, the series provides 4×900W to 4×1100W at 8Ω, making it an excellent choice for large-scale line array systems, passive subwoofers, touring productions, stadium events and fixed installation projects.

The dual-transformer design minimizes power interaction between channels, ensuring consistent output during high dynamic peaks while maintaining low distortion and excellent speaker control. Combined with a high damping factor, low THD and professional protection circuitry, the AF Series offers dependable operation for the most demanding live sound environments.

For complete sound reinforcement solutions, the AF Series integrates seamlessly with Stage Sound System and professional passive loudspeaker systems.

Why Choose the AF Dual Transformer Series?

• Dual transformer power supply for superior power stability

• Four independent amplifier channels

• High output up to 4×1100W @8Ω

• Up to 4×1600W @4Ω

• Excellent channel isolation and current delivery

• High damping factor (≥280)

• Ultra-low THD and IMD

• Signal-to-noise ratio ≥112dB

• Professional touring-grade construction

• Designed for continuous heavy-duty operation

Technical Specifications

AF409

AF411

Typical Applications

The AF Dual Transformer Series is ideal for:

• Large Concert Sound Systems

• Touring Productions

• Stadium and Arena Audio

• Line Array Speaker Systems

• Passive Subwoofer Systems

• Professional Rental Companies

• Houses of Worship

• Convention Centers

• Large Auditoriums

• Outdoor Festivals

• Theaters

• Permanent Sound Installations

Related Resources

To build a complete professional audio solution, you may also be interested in:

• Learn how to design a complete sound reinforcement solution with Stage Sound System.

• Pair the amplifier with Line Array Speakers for concerts and touring productions.

• Explore PA Speakers for professional sound reinforcement.

• Add powerful low-frequency performance using Subwoofers.

• Browse additional Power Amplifiers for different output and channel configurations.

• Discover complementary Pro Audio Elements for complete system integration.

• View real-world installation examples in Sound Solution Cases.

Why Dual Transformer Matters

• Independent power supply for better channel separation.

• Higher current reserve during dynamic audio peaks.

• Reduced power interference between amplifier channels.

• Improved reliability during continuous high-power operation.

• Excellent low-frequency control for large passive subwoofer systems.

• Preferred by professional touring companies for mission-critical performances.