For Home Or Outdoor Desktop Bookshelf Speakers And Subwoofers, Fosi Audio Bt30D Product Details Advanced 2.1CH Bluetooth 5.0 Receiver Amplifier achieves HiFi music quality, the best choice for your home audio entertainment. You can connect passive speakers/passive subwoofer/powered speakers/powered subwoofer to DIY a stereo sound system. Fosi Audio BT30D Pro is the upgraded version for BT30D. All-NEW Black Aluminum Appearance. BT30D VS BT30D Pro: MAX Power Output: 50 Watt x2+100 Watt VS 165 Watt x2+350 Watt, Amplifier Chip: TPA3116D2 VS TPA3255. Output: RCA output for powered subwoofers VS 3.5MM full-range output for powered subwoofers and speakers. Just choose one model for your needs. BT30D Pro Adopts 2PCS Texas Instruments TPA3255 high-performance Class-D power amplifier chip. BT30D Pro can drive up to 2 x 175 W into 4-? load and 2 x 220 W into 3-? load. In addition to excellent audio performance, TPA3255 achieves both high power efficiency and very low power stage idle losses below 1 W. This is achieved through the use of 60 m? MOSFETs and an optimized gate driver scheme that achieves significantly lower idle losses than typical discrete implementations. Professional wireless amp with subwoofer frequency, SUB volume, master volume/bass/treble control. No pop sound, no audible noise during the connection. Have a good time with Hifi music journey. What You Get: BT30D Pro Amp x1, power supply x1, user manual x1, our worry-free 24-month warranty, and friendly customer service. Payment We accept PayPal and credit cards via PayPal. Taxes - US We collect sales tax, as required by law. Shipping We make every effort of shipping within 3 business day of payment clearing. The estimated delivery time is 2 - 5 business days from the shipping date. Policies If you do need to return your item, please contact us via email (you will receive an email when your product ships with additional details - Subject: Important information about your purchase). You will then be provided with a return shipping label and packing slip. Pack the item carefully. Include the packing slip, apply the shipping label, and return the item within 30 business days of the date you request a return, or your return will be canceled. Once we receive your order we will inspect the return. Please allow up to 5 business days of receiving the returned item for your refund.