Pro Bass Shaker Transducer By Aurasound, Model Number Ast-2B-4. The Bass Shaker products allow you to experience every thump, thrust and shake...the way bass sound was originally intended. Mount the bass shaker firmly onto the object or furniture you want to vibrate. It must be mounted to something solid, like wood. The bass shaker produces a vibration at about 40Hz. Wire two together in series for an 8 ohm load or use a single at 4 ohm. Does not require a crossover. Only a 50 to 100 watt amplifier is needed to power it. Higher wattage is okay of course. Connecting two in parallel is a 2 ohm load, too low for most amplifiers. Here is how you add bass shakers to your home theater system: 1) Find the variable low-level RCA output for the subwoofer (LFE) channel on the rear panel of your AV receiver and disconnect the cable going to your powered subwoofer. 2) Connect a RCA Y-cable to the subwoofer output on your receiver. 3) Connect the cable from your subwoofer to one end of the Y-cable. 4) Connect a cable to the remaining unused end of the Y-cable to an input on the amplifier being used to power the shakers. 5) Connect the shakers to the output of the amplifier. 6) Set the relative level of the shakers by adjusting the volume control on the amplifier driving them. Product Features 50-Watt Pro Bass Shaker 5.4 x 2.2" Frame Impedance @ 4 Ohms and 40 Hz resonance frequency Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!