Hi I have an Altec Lansing IM510 docking station for my Sansa MP3 player the IM510 has a sub out for a subwoofer which is no longer available from Altec.The subwoofer they made had the following specs,cont power 16 watts 8 ohms,response bandwidth 40-175Hz,sound output 95dB,bass reflex,integrated audio amp.I have contacted Altec who can't seem to help.So what I need is a subwoofer on its own or part of a set.ie Logitech Z523/Z323.I don't want to damage my docking station (as this one was to difficult to aqquire) by plugging the wrong thing in to it.Any help would be appreciated.Thanks Mack.