Bestisan Subwoofer, Powered Home Audio Bestisan Sub Woofer With Deep Bass In Product Details For any questions or technical support, pls feel free to contact support@bestisan or ask through Q/A directly. POWERED SUBWOOFER FOR ROOM-SHAKING BASS- This sub has a frequency response range of 40 to 250 Hz with a low-pass crossover filter, which can be adjusted through the full range, pumps dynamic theater-quality bass into your bedroom and apartment. LFE LINE INPUTS FOR COMPATIBILITY WITH MOST RECEIVERS BOOKSHELF SPEAKERS? Hook a subwoofer cable (not supplied) between subwoofer out port on the receiver/ bookshelf speakers and LFE input RCA port on the sub. 6.5 INCH DOWN FIRING WOOFER - Long throw woofer with high rigidity PVA Treated cone, bottom slotted port, Bass Reflex cabinet design with vibration absorbing feet, high quality MDF with added internal bracing and black ash finish. ADJUSTABLE VOLUME AND LOW-FREQUENCY- Independent volume and low-frequency bandwidth adjustment knob located on the back panel of the subwoofer allows you to adjust the volume and low-frequency bandwidth according to your preference. CONNECT TO LAPTOP AND SOUNDBAR- Hook the Stereo RCA to 3.5mm audio cable in the box between line inputs on the subwoofer and headphone jack on your laptop, then connect to sound bar from aux out on sub to aux in on soundbar with 3.5mm audio cable (not supplied). 100% SATISFACTION SERVICE- Bestisan offers lifetime technical support. Any questions or suggestions, pls freely email us for help. We will give you back within 24 hours. 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.