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Fosi Audio BT30D PRO 165Wx2 +350W TPA3255 2.1 CH Bluetooth 5.0 Power Amplifier for Speaker Subwoofer,

Fosi Audio BT30D Bluetooth 5.0 2.1 Channel Power Amplifier with Bass & Treble Control,

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Fosi Audio Bluetooth Subwoofer Amplifier 2.1, BT30D Pro Subwoofer Amp with TPA3255 Chips 165W x2+350W & Bass Treble Control, 2.1 Channel Sub Amplifier for Desktop/Outdoor/Bookshelf Speakers : Electronics - Amazon.com,