If you want stereo...
Use a stereo 3.5mm to twin phono (RCA) adapter, then a phono to 3.5mm cable to each BoomCan.
You can probably get a 3.5mm stereo to two 3.5mm mono cable from Maplin/Radio Shack too.
There is no shortage of small speakers for phones and music players, but few deliver much in the way of welly, or even sound quality. Scosche BoomCan mini travel speaker Not that you should expect a pristine hi-fi experience when you're using an ad hoc speaker such as Scorche's new BoomCan, but it's capable of pumping out a …