ZK-AS21 2.1 Channel Bluetooth 5.1 Power Amplifier Board (220W+220W+350W) with Treble & Bass Control

Description

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Overview: The ZK-AS21 is a beast in DIY audio amplifiers, designed for high-power HiFi 2.1 channel audio systems. Powered by dual high-performance class-D amplifier chips and an active cooling fan, this board delivers crisp highs, deep punchy sub-bass, and crystal-clear stereo sound without distortion.

Key Features:

• 2.1 Channel HiFi Output: Left Channel 220W + Right Channel 220W + Subwoofer 350W (Max 790W peak output).

• Bluetooth 5.1 Connectivity: Up to 15 meters stable transmission with low latency, AUX input, and USB flash drive support.

• Full Audio Customization: 5 rotary knobs for Subwoofer Frequency, Subwoofer Volume, Left/Right Treble, Left/Right Bass, and Master Volume.

• Active Cooling Fan & Heat Sink: Built-in low-noise cooling fan ensures non-stop performance during heavy bass playback.

• Multi-Layer Protection: Over-voltage, under-voltage, overheating, DC detection, and short-circuit protection.

Technical Specifications:

• Model: ZK-AS21

• Audio Channels: 2.1 Channel (Left + Right + Subwoofer)

• Bluetooth Version: 5.1

• Input Voltage: DC 18V – 38V (5A or above recommended)

• Output Power:

  • Left / Right Channel: up to 220W @ 38V, 3–8Ω

  • Subwoofer: up to 350W @ 38V, 2–8Ω

• Audio Inputs: Bluetooth, AUX 3.5mm, USB Flash Drive

• Adaptive Speaker: 30W – 350W; 4Ω – 8Ω

Package Includes:

• 1 $\times$ ZK-AS21 Bluetooth Amplifier Board (Pre-assembled top & bottom protective case)

• 1 $\times$ Small Screwdriver

• 5 $\times$ Knob Caps