2.1 Channel Bluetooth Amplifier Module Audio Amplifier Module (AUX + Bluetooth + USB Digital Amplifier)

ZK-HT21 2.1-channel Bluetooth amplifier module Audio amplifier module 160W+160W+220W AUX+Bluetooth+USB Digital amplifier dedicated inductor Supports TWS pag APP version

Product Description:  
How to Choose a Power Supply: The power supply paired with the board is critical. The selected power supply must have minimal ripple. A power supply with high ripple will cause increased background noise on the amplifier board and produce t noise.
Higher voltage means higher t and sufficient output power. If you only have 12V1A, this can power 3-4 inch speakers. If you have 19V5A or above, powering 8-10 inch speakers is no problem. The power supply must be given top priority. If the voltage is too low, sound amplification may cause distortion. If the t is too low, the speakers may pull down the voltage, causing abnormal operation or degraded sound quality.
Audio input mode introduction: This amplifier module has four audio input methods: Bluetooth, AUX, USB drive, and USB sound card. Bluetooth mode is prioritised. After powering on, inserting the input cable will
automatically the mode, or you can modes within the app.
How to adjust the main volume: The MAIN-VOLUME knob adjusts the main volume. Turning it clockwise increases the volume, and counterclockwise decreases it. The main volume affects the volume of both left and right channels and the subwoofer:
If the sound is too low, it’s fine, but if it becomes too loud, the sound may become muddy? If distortion occurs, reduce the overall volume or use a power adapter with a higher voltage rating.
If the sound is fine at low volumes but becomes choppy at higher volumes: The input power supply may be insufficient, causing the power supply to intermittently shut down for protection. Please replace it with a higher-power power supply; or the power supply may be too high, causing the amplifier board to overheat and t-rigger thermal protection. Reduce the power usage or improve cooling.
Factors affecting sound quality: Sound quality is not only related to the amplifier module but also to the power supply, audio source, and the entire audio system. Every component of the audio system affects sound quality, with key components including audio transmission cables, audio power supply, tone control circuitry, amplifier circuitry, speakers, and the surrounding environment. Optimal sound quality is achieved when the audio source, power supply, amplifier module, and speakers are properly matched.

Features:
AUX + Bluetooth + USB
Clear and transparent midrange
Digital amplifier-specific inductors
Supports APP
Supports TWS pag
More lossless decoding
WAV/FLAC/APE
Karaoke board expansion port
Subwoofer expansion port

Specifications:
Product name: 2.1-channel Bluetooth audio amplifier module
Product Model: ZK-HT21
Number of Channels: 2.1-channel (left channel + right channel + subwoofer)
Amplifier Chip: TDA7498E
Output Power: Left and Right Channels <160W, Subwoofer <220W
Protection Mechanisms: Reverse Polarity Protection, Undervoltage Protection, Overheat Protection, Overt Protection, Short Circuit Protection
TWS Pag: Supported
Power Supply Compatibility: DC 15-36V (Undervoltage Protection Below 9V, Also Supports 12V Power Supply)
Compatible speakers: 30-200W, 4-8Ω  
Input methods: AUX + Bluetooth + USB + APP (rotary knob buttons for mode and song selection)  
Bluetooth version: 5.3 (line-of-sight, 15 metres)  
Product weight: 344g net weight (all-in-one), 39 including packaging
Product dimensions: 145 × 126 × 28 mm  
Potentiometer-mounted net weight: 270g, packaged weight: 337g  
Packaging dimensions: 16.5 × 14.5 × 5 cm  
Weight: 270g/337g  

Packing list:  
1 x Audio amplifier module  
1 x Screwdriver  
1 x Accessory kit  
1 x Manual