For sale, Sony SA-WM40 amplified subwoofer, 120watts RMS, 12" driver, seriously loud, so loud it used to make our front door vibrate !! £145 ovno. Item is located in Colchester, Essex - however I do travel daily to Wickford, nr Basildon if that helps. Would consider arranging postage, but it would be at your expense..... Genuine seller, please feel free to check me out in ebay, I use the same user name, feedback rating of 250+ !! If you have one of them package surround sound systems with a passive sub, then this little beauty is what you need, it replaces the passive sub with an active sub, it has variable levels so you can crank it up as loud as you dare, 120watts doesnt sound much but this is a true RMS rating not a peak rating, so trust me its plenty loud enough !!!! Feel free to contact me, only to willing to discuss. Can email you a pdf document on this item if your interested. This item is listed in ebay, but would rather sell it private so I dont have to give ebay a cut (the greedy swines, lol). Paypal payments can be accepted, likewise would rather sell direct to yah to avoid giving Paypal a cut (the even greedier swines, lol).