ZK-AS21 TPA3255 Bluetooth 5.1 Power Amplifier Board – Hi-Fi 2.1 Channel 220W x 2 + 350W Digital Audio Receiver with Treble, Bass, and Subwoofer Frequency Control

Product Description

Experience true Hi-Fi performance with the ZK-AS21 TPA3255 Bluetooth 5.1 Power Amplifier Board. This 2.1 channel digital powerhouse utilizes dual TPA3255 chips to deliver a massive 220W per stereo channel and a dedicated 350W output for your subwoofer. At Robogears, we recommend the ZK-AS21 for its exceptional clarity and ultra-low distortion across the entire audio band. Unlike basic amplifiers, this board offers independent tuning for treble and bass, along with a dedicated crossover frequency control (20-200Hz) for the subwoofer. Equipped with Bluetooth 5.1, AUX, and USB inputs, it is a versatile solution for DIY speaker builds and home theater upgrades. The built-in silent cooling fan and robust protection circuitry ensure that your system remains cool and safe even during high-power marathon listening sessions at your Pimpri facility.

Detailed Key Features

• Massive 2.1 Channel Output: Delivers high-definition sound with 220W for left and right speakers plus 350W for a deep, cinematic subwoofer experience.

• Precision TPA3255 Architecture: Features high-performance Class D efficiency with integrated feedback and error correction for crystal-clear, audiophile-grade audio.

• Comprehensive Sound Control: Equipped with six low-noise preamplifiers (30dB gain) and dedicated knobs for main volume, L/R treble/bass, and subwoofer frequency/volume.

• Versatile Connectivity: Supports high-speed Bluetooth 5.1 for wireless streaming, alongside traditional AUX, USB disk playback, and USB sound card modes.

• Intelligent App Integration: Compatible with the "Wuzhi Audio" APP to customize Bluetooth names, set passwords, adjust sound effects (10-segment EQ), and manage playlists.

All Technical Details

• Mechanical Power Switch: Features a quick-response mechanical switch for instant power-off without the need for long-pressing.

• Stepless Tuning: Utilizes a high-end rotary encoder for smooth, infinite volume adjustment rather than discrete digital steps.

• Safety Protection: Multi-stage safeguards include anti-reverse connection, undervoltage, overheating, overcurrent, and short-circuit protection with automatic recovery.

• Build Quality: Constructed with an anti-static PCB and a protective shell to ensure durability during assembly and long-term use.