SOLD! I recently replaced my 4 Aura AST-1B4 bass shakers with two Buttkickers. The bass shakers are an inexpensive way to experience the joys of tactile transducers. I will sell a pair of the Aura bass shakers (25 watt model) for $25 shipped to the continental U.S. or all four for $46 shipped. Compared to similar new bass shakers from PartsExpress with shipping the potential savings is about $15 for a pair. I do not have the original boxes, but I will pack the shakers appropriately for shipping. The bass shakers were connected in my system in series to provide a nominal 8 ohm load which is easy to drive with an inexpensive amp. The wires on the shakers have been stripped to bare wire at the end to make the connections easier.