{"id":2009590,"date":"2026-05-18T01:25:53","date_gmt":"2026-05-18T01:25:53","guid":{"rendered":"https:\/\/kingsideaconnections.org\/commerce\/?post_type=product&#038;p=2009590"},"modified":"2026-05-18T01:25:53","modified_gmt":"2026-05-18T01:25:53","slug":"zk-st21-2-1-channel-bluetooth-amplifier-board-100w100w200w-subwoofer-tpa3221-support-bluetooth-aux-u-disk-sound-card","status":"publish","type":"product","link":"https:\/\/kingsideaconnections.org\/commerce\/product\/zk-st21-2-1-channel-bluetooth-amplifier-board-100w100w200w-subwoofer-tpa3221-support-bluetooth-aux-u-disk-sound-card\/","title":{"rendered":"ZK-ST21 2.1 Channel Bluetooth Amplifier Board 100W+100W+200W Subwoofer TPA3221 Support Bluetooth AUX U Disk Sound Card"},"content":{"rendered":"<p>Features 1  Adopting high power digital power amplifier specific inductance  high current  low magnetic loss  low heat generation  using oxygen free copper wire to improve sound quality  and magnetic shielding mechanism to resist electromagnetic interference 2  Equipped with two TPA3221 chips  it supports 2 1 channel Bluetooth digital amplifier 100W 100W 200W high power 3  Subwoofer expansion port  supporting the installation of 1602 and 3002 4  Multiple expansion ports  capable of connecting to microphone front stage board reverb input or output  convenient to use 5  Equipped with protection mechanism  input undervoltage  input anti reverse connection  overheating  overcurrent  and short circuit protection Parameter Product name  2 1 channel BT amplifier board 100W 100W 200WProduct model  ZK ST21Adapted power supply  The working voltage range is 12 30VDC  and it is recommended to use a DC power supply with a voltage of 24V 28V and a current of 10A or above Maximum power  left or right channel   105W 30V   4 \u03a9  55W 30V   8 \u03a9  Subwoofer   208W 30V 2 \u03a9  105W 30V   4 \u03a9  In short  the higher the voltage  the smaller the resistance  and the greater the output power Adapted speakers  left and right channels  supporting speakers up to 3 8 \u03a9 and 100W  The subwoofer supports speakers up to 2 8 \u03a9 and 200W BT chip  JieLi 5 1  transmission distance of 15 metersInput method  BT AUX USB drive sound cardNumber of channels  2 1  left channel right channel subwooferPower amplifier chip  Two T<\/p>\n\n    <div class=\"xs_social_share_widget xs_share_url after_content \t\tmain_content  wslu-style-1 wslu-share-box-shaped wslu-fill-colored wslu-none wslu-share-horizontal wslu-theme-font-no wslu-main_content\">\n\n\t\t\n        <ul>\n\t\t\t        <\/ul>\n    <\/div> \n","protected":false},"excerpt":{"rendered":"<p>Manufacturer 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